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Drug overview for TADALAFIL (tadalafil):
Generic name: tadalafil (tah-DA-la-fil)
Drug class: Agents to Treat Erectile Dysfunction, cGMP-Type
Therapeutic class: Drugs to treat Erectile Dysfunction
Tadalafil, a selective phosphodiesterase (PDE) type 5 inhibitor, is a vasodilating agent.
No enhanced Uses information available for this drug.
Generic name: tadalafil (tah-DA-la-fil)
Drug class: Agents to Treat Erectile Dysfunction, cGMP-Type
Therapeutic class: Drugs to treat Erectile Dysfunction
Tadalafil, a selective phosphodiesterase (PDE) type 5 inhibitor, is a vasodilating agent.
No enhanced Uses information available for this drug.
DRUG IMAGES
TADALAFIL 2.5 MG TABLET
TADALAFIL 10 MG TABLET
TADALAFIL 20 MG TABLET
The following indications for TADALAFIL (tadalafil) have been approved by the FDA:
Indications:
Benign prostatic hyperplasia with lower urinary tract symptom
Erectile dysfunction
Professional Synonyms:
Impotency
Symptomatic benign prostatic hyperplasia
Symptomatic benign prostatic hypertrophy
Symptomatic BPH
Symptomatic prostatic hypertrophy
Indications:
Benign prostatic hyperplasia with lower urinary tract symptom
Erectile dysfunction
Professional Synonyms:
Impotency
Symptomatic benign prostatic hyperplasia
Symptomatic benign prostatic hypertrophy
Symptomatic BPH
Symptomatic prostatic hypertrophy
The following dosing information is available for TADALAFIL (tadalafil):
No enhanced Dosing information available for this drug.
Tadalafil is administered orally without regard to meals.
| DRUG LABEL | DOSING TYPE | DOSING INSTRUCTIONS |
|---|---|---|
| TADALAFIL 2.5 MG TABLET | Maintenance | Adults take 1 tablet (2.5 mg) by oral route once daily |
| TADALAFIL 10 MG TABLET | Maintenance | Adults take 1 tablet (10 mg) by oral route once daily |
| TADALAFIL 20 MG TABLET | Maintenance | Adults take 1 tablet (20 mg) by oral route once daily |
| DRUG LABEL | DOSING TYPE | DOSING INSTRUCTIONS |
|---|---|---|
| TADALAFIL 2.5 MG TABLET | Maintenance | Adults take 1 tablet (2.5 mg) by oral route once daily |
| TADALAFIL 10 MG TABLET | Maintenance | Adults take 1 tablet (10 mg) by oral route once daily |
| TADALAFIL 20 MG TABLET | Maintenance | Adults take 1 tablet (20 mg) by oral route once daily |
The following drug interaction information is available for TADALAFIL (tadalafil):
There are 2 contraindications.
These drug combinations generally should not be dispensed or administered to the same patient. A manufacturer label warning that indicates the contraindication warrants inclusion of a drug combination in this category, regardless of clinical evidence or lack of clinical evidence to support the contraindication.
| Drug Interaction | Drug Names |
|---|---|
| CGMP Specific PDE Type-5 Inhibitors/Nitrates SEVERITY LEVEL: 1-Contraindicated Drug Combination: This drug combination is contraindicated and generally should not be dispensed or administered to the same patient. MECHANISM OF ACTION: Nitrates activate guanyl cyclase, an enzyme that increases levels of cyclic guanosine monophosphate (cGMP). cGMP produces smooth muscle relaxation. Avanafil,(1) sildenafil,(2) tadalafil,(3,4) and vardenafil (5-7) inhibit phosphodiesterase type 5 (PDE5), which is responsible for the breakdown of cGMP. Concurrent use of nitrates with avanafil,(1) sildenafil,(2) tadalafil,(3,4) or vardenafil(5-7) results in potentiation of the effect of nitrates. CLINICAL EFFECTS: The concurrent use of CGMP specific PDE type-5 inhibitors and nitrates potentiates the hypotensive effects of nitrates(1-7) which may result in dizziness, syncope, heart attack, or stroke.(4) The concurrent use of sildenafil and sodium nitroprusside may potentiate the antiaggregatory effect of sodium nitroprusside in addition to increased hypotensive effects.(2) PREDISPOSING FACTORS: Plasma levels of the PDE type-5 inhibitor may be higher in the following patients: those older than 65, with hepatic impairment, with severe renal impairment, or using concomitant CYP3A4 inhibitors. This may increase the severity of the interaction. PATIENT MANAGEMENT: The administration of avanafil to patients receiving organic nitrates, either regularly and/or intermittently, is contraindicated. In a patient who has taken avanafil, at least 12 hours should elapse after the last dose of avanafil before nitrate administration is considered and it should only be administered under close medical supervision with appropriate hemodynamic monitoring.(1) The administration of sildenafil to patients receiving organic nitrates, either regularly and/or intermittently, in any form is contraindicated.(2) The administration of tadalafil to patients receiving any form of organic nitrate, either regularly and/or intermittently, is contraindicated.(3,4) Patients should be instructed to seek immediate medical attention if they experience anginal chest pain following tadalafil. In such cases where nitrate administration is considered medically necessary, at least 48 hours should elapse after tadalafil administration before nitrate administration is considered. In such cases, nitrates should only be administered under close medical supervision with appropriate hemodynamic monitoring.(4) The administration of vardenafil to patients receiving nitrates or nitric oxide donors is contraindicated.(5-7) In patients prescribed vardenafil in whom nitrate administration is deemed medically necessary in a life-threatening situation, the Canadian manufacturer of vardenafil states that at least 24 hours should have elapsed after the last dose of vardenafil before the nitrate administration is considered. Nitrates should only be administered under close medical supervision with appropriate hemodynamic monitoring.(7) The concomitant use of nicorandil(8) or subinguinal nitroglycerin(9) and PDE type-5 inhibitors is contraindicated. Treat hypotension resulting from concurrent use as a nitrate overdose, with elevation of the extremities and central volume expansion.(10) DISCUSSION: Nitrates activate guanylate cyclase, an enzyme that increases levels of cGMP. cGMP produces smooth muscle relaxation. Avanafil,(1) sildenafil,(2) tadalafil,(3,4) and vardenafil (5-7) inhibit PDE5, which is responsible for the breakdown of cGMP. Concurrent use of nitrates with avanafil,(1) sildenafil,(2) tadalafil,(3,4) or vardenafil(5-7) results in potentiation of the effect of nitrates. It is unknown when nitrates, if necessary, can be safely administered to patients who have taken CGMP specific PDE type-5 inhibitors. Following a single 100 mg oral dose of sildenafil, peak plasma levels are approximately 440 ng/mL and levels 24 hours post dose are approximately 2 ng/ml. Sildenafil plasma levels at 24 hours post dose are three to eight times higher in the following patients: those age greater than 65, those with hepatic impairment, those with severe renal impairment (creatinine clearance less than 30 ml/min), and those with concomitant use of potent CYP P-450-3A4 inhibitors (erythromycin). Although plasma levels of sildenafil are lower at 24 hours post dose, the manufacturer of sildenafil states that it is still unknown whether nitrates can safely be coadministered at that time.(2) In vitro studies with human platelets have shown that sildenafil potentiates the antiaggregatory effect of sodium nitroprusside.(2) In a study of 150 subjects who received tadalafil (20 mg) daily for 7 days, sublingual nitroglycerin was administered at 2, 4, 8, 24, 48, 72, and 96 hours after tadalafil. A significant interaction between tadalafil and nitroglycerin was observed up to and including 24 hours post-tadalafil. At 48 hours, the interaction was not observed by most hemodynamic measures. After 48 hours, the interaction was not detectable.(4) In a population-based cohort study of 61,487 men who received nitrates, 5,710 (9%) concurrently received PDE Type-5 inhibitors (PDE5i). Crude hazard ratios found a significant and inverse association between combination use of nitrates and PDE5i and all cause, cardiovascular, and non-cardiovascular mortality. All-cause mortality incidence rates were 2.69 cases per 100 person-years for the nitrate and PDE5i group vs 3.83 cases per 100 person-years in the nitrate-only group. Concurrent use of nitrates and PDE5i found a multivariate adjusted HR for all-cause mortality of 1.39 (95% CI: 1.28-1.51). Concurrent use of nitrates and PDE5i found an adjusted HR for cardiovascular death, non-cardiovascular death, myocardial infarction, heart failure, revascularization, and major adverse cardiovascular event (MACE) in patients treated with both nitrates and PDE5i was 1.34 (95% CI: 1.11-1.62), 1.40 (95% CI: 1.27-1.54), 1.72 (95% CI: 1.55-1.90), 1.67 (95% CI: 1.48-1.90), 1.95 (95% CI: 1.78-2.13), and 1.70 (95% CI: 1.58-1.83), respectively, compared with patients with nitrates only.(11) |
AMYL NITRITE, BIDIL, GONITRO, ISORDIL, ISORDIL TITRADOSE, ISOSORBIDE, ISOSORBIDE DINIT-HYDRALAZINE, ISOSORBIDE DINITRATE, ISOSORBIDE MONONITRATE, ISOSORBIDE MONONITRATE ER, NIPRIDE RTU, NITHIODOTE, NITRO-BID, NITRO-DUR, NITRO-TIME, NITROGLYCERIN, NITROGLYCERIN IN D5W, NITROGLYCERIN PATCH, NITROLINGUAL, NITROMIST, NITROSTAT, RECTIV, SODIUM NITRITE, SODIUM NITROPRUSSIDE, SODIUM NITROPRUSSIDE-0.9% NACL |
| Riociguat/PDE Inhibitors SEVERITY LEVEL: 1-Contraindicated Drug Combination: This drug combination is contraindicated and generally should not be dispensed or administered to the same patient. MECHANISM OF ACTION: Riociguat stimulates the nitric oxide-soluble guanylate cyclase-cyclic guanosine monophosphate (cGMP) pathway and also increases cGMP.(1) Aminophylline, avanafil, dipyridamole, sildenafil, tadalafil, theophylline, and vardenafil inhibit phosphodiesterase (PDE), which is responsible for the breakdown of cGMP.(1) CLINICAL EFFECTS: The concurrent use of PDE inhibitors and riociguat potentiates the hypotensive effects of both agents, which may result in dizziness, syncope, heart attack, or stroke.(1) PREDISPOSING FACTORS: Plasma levels of the PDE type-5 inhibitors may be higher in the following patients: those older than 65, with hepatic impairment, with severe renal impairment, or using concomitant CYP3A4 inhibitors. This may increase the severity of the interaction. PATIENT MANAGEMENT: The administration of riociguat to patients receiving PDE inhibitors, including specific PDE-5 inhibitors (avanafil (5), sildenafil (2), tadalafil (3,6), or vardenafil (4)) and nonspecific PDE inhibitors (aminophylline, dipyridamole, theophylline) is contraindicated.(1) If transitioning from sildenafil to riociguat, discontinue sildenafil at least 24 hours prior to administering riociguat.(1) If transitioning from tadalafil to riociguat, discontinue tadalafil at least 48 hours prior to administering riociguat. Consider starting riociguat at 0.5 mg in patients at risk for hypotension.(1) If transitioning from riociguat to a PDE inhibitor, discontinue riociguat at least 24 hours prior to administering a PDE inhibitor.(1) DISCUSSION: In a study of 7 PAH patients maintained on sildenafil (20 mg TID), single doses of riociguat (0.5 mg and 1 mg, sequentially) showed additive hemodynamic effects.(1) In clinical trials, there was a high rate of discontinuation for hypotension among patients receiving sildenafil (20 mg TID) and riociguat (1 mg to 2.5 mg TID) and one death.(1) |
ADEMPAS |
There are 2 severe interactions.
These drug interactions can produce serious consequences in most patients. Actions required for severe interactions include, but are not limited to, discontinuing one or both agents, adjusting dosage, altering administration scheduling, and providing additional patient monitoring. Review the full interaction monograph for more information.
| Drug Interaction | Drug Names |
|---|---|
| Vericiguat/PDE Inhibitors SEVERITY LEVEL: 2-Severe Interaction: Action is required to reduce the risk of severe adverse interaction. MECHANISM OF ACTION: Vericiguat stimulates the nitric oxide-soluble guanylate cyclase-cyclic guanosine monophosphate (cGMP) pathway and also increases cGMP.(1) Aminophylline, avanafil, dipyridamole, sildenafil, tadalafil, theophylline, and vardenafil inhibit phosphodiesterase (PDE), which is responsible for the breakdown of cGMP.(1-6) CLINICAL EFFECTS: The concurrent use of PDE inhibitors and vericiguat potentiates the hypotensive effects of both agents, which may result in dizziness, syncope, heart attack, or stroke.(1) PREDISPOSING FACTORS: Plasma levels of the PDE type-5 inhibitors may be higher in the following patients: those older than 65, with hepatic impairment, or with severe renal impairment. This may increase the severity of the interaction. PATIENT MANAGEMENT: The manufacturer of vericiguat states that administration of vericiguat to patients receiving PDE inhibitors, including specific PDE-5 inhibitors (avanafil,(2) sildenafil,(3) tadalafil,(4,5) or vardenafil(6)) and nonspecific PDE inhibitors (aminophylline, dipyridamole, theophylline) is not recommended.(1) The manufacturers of the PDE-5 inhibitors state that concurrent use of guanylate cyclase stimulators is contraindicated.(2-6) DISCUSSION: Concomitant use of vericiguat 10 mg with single doses of sildenafil (25, 50, or 100 mg) was associated with additional seated BP reduction of up to 5.4 mm Hg (systolic/diastolic BP, MAP), compared to administration of vericiguat alone.(1) |
VERQUVO |
| Sildenafil (ED);Tadalafil (ED)/Lenacapavir SEVERITY LEVEL: 2-Severe Interaction: Action is required to reduce the risk of severe adverse interaction. MECHANISM OF ACTION: Lenacapavir may inhibit the metabolism of sildenafil and tadalafil by CYP3A4.(1-4) CLINICAL EFFECTS: The concurrent administration of lenacapavir may result in elevated levels of sildenafil and tadalafil, which may result in increased adverse effects such as hypotension, visual changes, and priapism.(1-4) PREDISPOSING FACTORS: None determined. PATIENT MANAGEMENT: The US manufacturer of sildenafil and the UK and Canadian manufacturers of lenacapavir recommend a starting dose of 25 mg of sildenafil for erectile dysfunction in patients receiving concomitant therapy.(1, 3-5) The US manufacturer of tadalafil and the UK and Canadian manufacturers of lenacapavir state that the recommended dose of as needed tadalafil for the treatment of erectile dysfunction is 10 mg of tadalafil every 72 hours in patients receiving concomitant therapy.(2-5) The US manufacturer of tadalafil and the UK and Canadian manufacturers of lenacapavir state that the recommended dose of daily tadalafil for the treatment of erectile dysfunction is 2.5 mg in patients receiving concomitant therapy.(2-5) The US manufacturer of tadalafil chewable tablets (Chewtadzy) states the maximum recommended dose of as needed tadalafil for erectile dysfunction in patients taking strong CYP3A4 inhibitors is 10 mg every 72 hours. The use of tadalafil chewable tablets (Chewtazdy) for once daily use for erectile dysfunction or benign prostatic hyperplasia (BPH) is not recommended in patients taking strong CYP3A4 inhibitors due to the lack of a 2.5 mg tablet strength.(6) The manufacturer of lenacapavir states the concurrent use of tadalafil for pulmonary arterial hypertension (PAH) is not recommended.(3-5) Patients should be counseled that they are at an increased risk of tadalafil adverse effects, including hypotension, syncope, visual changes, and priapism. Patients experiencing these effects should report them promptly to their physician. DISCUSSION: Concurrent administration of a single 100 mg dose of sildenafil with erythromycin (500 mg twice daily for five days) resulted in an increase of sildenafil area-under-curve (AUC) by 182%. Therefore, the manufacturer of sildenafil recommends a starting dose of 25 mg of sildenafil in patients receiving concomitant therapy with other strong CYP3A4 inhibitors such as itraconazole or ketoconazole.(1) Concurrent administration of a single 20 mg dose of tadalafil with ketoconazole (400 mg daily) increased tadalafil AUC and maximum concentration (Cmax) by 312% and 22%, respectively. Concurrent administration of a single 10 mg dose of tadalafil with ketoconazole (200 mg daily) increased tadalafil AUC and Cmax by 107% and 15%, respectively.(2) Concurrent administration of lenacapavir 600 mg with a single 2.5 mg dose of midazolam (a CYP3A4 substrate) increased midazolam maximum concentration (Cmax) and area-under-curve (AUC) by 1.94-fold and 3.59-fold, respectively.(3-5) |
SUNLENCA |
There are 5 moderate interactions.
The clinician should assess the patient’s characteristics and take action as needed. Actions required for moderate interactions include, but are not limited to, discontinuing one or both agents, adjusting dosage, altering administration.
| Drug Interaction | Drug Names |
|---|---|
| Sildenafil (for ED); Tadalafil (for ED)/Selected Strong CYP3A4 Inhibitors SEVERITY LEVEL: 3-Moderate Interaction: Assess the risk to the patient and take action as needed. MECHANISM OF ACTION: Strong CYP3A4 inhibitors may inhibit the metabolism of sildenafil(1) and tadalafil.(2) CLINICAL EFFECTS: Concurrent use of strong CYP3A4 inhibitors may result in increased levels, clinical effects, and side effects of sildenafil(1) and tadalafil.(2) PREDISPOSING FACTORS: None determined. PATIENT MANAGEMENT: The US manufacturer of sildenafil recommends a starting dose of 25 mg of sildenafil for erectile dysfunction in patients receiving concomitant therapy with strong CYP3A4 inhibitors.(1) The US manufacturer of tadalafil states that the maximum recommended dose of as needed tadalafil for erectile dysfunction in patients taking strong inhibitors of CYP3A4 is 10 mg every 72 hours.(2) The maximum recommended dose of daily tadalafil for erectile dysfunction in patients taking strong inhibitors of CYP3A4 is 2.5 mg.(3) The US manufacturer of tadalafil chewable tablets (Chewtadzy) states the maximum recommended dose of as needed tadalafil for erectile dysfunction in patients taking strong CYP3A4 inhibitors is 10 mg every 72 hours. The use of tadalafil chewable tablets (Chewtazdy) for once daily use for erectile dysfunction or benign prostatic hyperplasia (BPH) is not recommended in patients taking strong CYP3A4 inhibitors due to the lack of a 2.5 mg tablet strength.(3) DISCUSSION: Concurrent administration of a single 100 mg dose of sildenafil with erythromycin (500 mg twice daily for five days) resulted in an increase of sildenafil area-under-curve (AUC) by 182%. Therefore, the manufacturer of sildenafil recommends a starting dose of 25 mg of sildenafil in patients receiving concomitant therapy with other strong CYP3A4 inhibitors such as itraconazole or ketoconazole.(1) Concurrent administration of a single 20 mg dose of tadalafil with ketoconazole (400 mg daily) increased tadalafil AUC and maximum concentration (Cmax) by 312% and 22%, respectively. Concurrent administration of a single 10 mg dose of tadalafil with ketoconazole (200 mg daily) increased tadalafil AUC and Cmax by 107% and 15%, respectively.(2) Strong CYP3A4 inhibitors include adagrasib, ceritinib, clarithromycin, grapefruit, idelalisib, itraconazole, josamycin, ketoconazole, levoketoconazole, lonafarnib, nefazodone, posaconazole, ribociclib, telithromycin, tucatinib, and voriconazole.(4,5) |
CLARITHROMYCIN, CLARITHROMYCIN ER, ITRACONAZOLE, ITRACONAZOLE MICRONIZED, KETOCONAZOLE, KISQALI, KRAZATI, LANSOPRAZOL-AMOXICIL-CLARITHRO, NEFAZODONE HCL, NOXAFIL, OMECLAMOX-PAK, POSACONAZOLE, RECORLEV, SPORANOX, TOLSURA, TUKYSA, VFEND, VFEND IV, VOQUEZNA TRIPLE PAK, VORICONAZOLE, ZOKINVY, ZYDELIG, ZYKADIA |
| CGMP Specific PDE Type-5 Inhibitors/Alpha-Blockers SEVERITY LEVEL: 3-Moderate Interaction: Assess the risk to the patient and take action as needed. MECHANISM OF ACTION: Concurrent use of avanafil,(1) sildenafil,(2-5) tadalafil,(6-9) or vardenafil(10-14) and an alpha-blocker may result in additive or synergistic effects on blood pressure. CLINICAL EFFECTS: Concurrent use of avanafil,(1) sildenafil,(2-5) tadalafil,(6-9) or vardenafil(10-14)) and an alpha-blocker may result in symptomatic hypotension. PREDISPOSING FACTORS: Patients who have a history of hemodynamic instability on alpha-blocker therapy prior to initiating avanafil, sildenafil, tadalafil, or vardenafil may be at an increased risk of symptomatic hypotension during concurrent therapy. PATIENT MANAGEMENT: The US manufacturer of avanafil states that patients taking alpha-blockers should be stabilized on their alpha-blocker prior to beginning avanafil therapy. Avanafil should be initiated at the 50 mg dosage. In patients stabilized on avanafil therapy, alpha-blocker therapy should be initiated at the lowest possible dosage.(1) The US, Australian, Canadian, and UK manufacturers of sildenafil state that patients taking alpha-blockers should be stabilized on their alpha-blocker prior to beginning sildenafil therapy. Sildenafil should be initiated at the lowest possible dosage. In patients stabilized on sildenafil therapy, alpha-blocker therapy should be initiated at the lowest possible dosage.(2-5) The US manufacturer of tadalafil states that patients taking tadalafil for erectile dysfunction (ED) and alpha-blockers should be stabilized on their alpha-blocker prior to beginning tadalafil therapy. Tadalafil should be initiated at the lowest possible dosage. In patients stabilized on tadalafil therapy, alpha-blocker therapy should be initiated at the lowest possible dose. The combination of tadalafil and an alpha-blocker for treatment of benign prostatic hyperplasia (BPH) is not recommended. Patients on alpha-blocker therapy for BPH should discontinue their alpha-blocker at least one day prior to starting tadalafil for once daily use for the treatment of BPH.(6) The Australian manufacturer of tadalafil states that tadalafil should be used with caution in patients taking alpha-blockers.(7) The Canadian manufacturer of tadalafil states that it may be used with tamsulosin and should be used with caution with other alpha-blockers.(8) The UK manufacturer of tadalafil states that concurrent use with alpha-blockers is not recommended.(9) The US, Canadian, and UK manufacturers of vardenafil state that patients taking alpha-blockers should be stabilized on their alpha-blocker prior to beginning vardenafil therapy. Vardenafil should be initiated at the lowest possible dosage. In patients stabilized on vardenafil therapy, alpha-blocker therapy should be initiated at the lowest possible dosage.(10-12) The UK manufacturer of vardenafil states that vardenafil may be give at any time in relation to tamsulosin; however, a dose separation period of 6 hour should be considered for other alpha-blockers.(12) The Australian manufacturer of vardenafil states that concurrent use with alpha-blockers is not recommended.(13) The US manufacturers of doxazosin,(14) prazosin(15) and terazosin(16) state that PDE-5 inhibitor therapy should be initiated at the lowest dose. DISCUSSION: In a study in 24 subjects, concurrent use of avanafil (200 mg) with doxazosin (1 mg on Day 1, titrated to 8 mg for Days 8-18) resulted in 7 subjects experiencing potentially clinically significant changes in blood pressure.(1) In a study in 24 subjects, concurrent use of avanafil (200 mg) with tamsulosin (0.4 mg Days 1-11) resulted in 5 subjects experiencing potentially clinically significant changes in blood pressure.(1) Simultaneous administration of sildenafil (25 mg) and doxazosin (4 mg) resulted in mean additional reductions of supine blood pressure of 7 mmHg systolic and 7 mmHg diastolic. When doxazosin (4 mg) was simultaneously administered with higher doses of sildenafil, there were reports of symptomatic postural hypotension within one to four hours.(2) In a study, concurrent administration of a single dose of tadalafil (20 mg) to healthy subjects receiving alfuzosin (10 mg daily) resulted in mean maximum decreases in standing and supine systolic blood pressure by 2.2 mmHg and 4.4 mmHg, respectively. There were no subjects with a decrease from baseline standing systolic blood pressure greater than 30 mmHg.(6) In a study, concurrent administration of a single dose of tadalafil (20 mg) to 18 healthy subjects receiving doxazosin (8 mg daily) resulted in significant augmentation of the blood-pressure lowering effects of doxazosin (by 9.8 mmHg). The number of subjects with a standing blood pressure of less than 85 mmHg was greater after concurrent doxazosin and tadalafil than when compared to doxazosin with placebo (28% versus 6%). One subject reported vertigo and another reported dizziness. No syncope was reported.(5,14) In a second study, concurrent administration of a single dose of tadalafil (20 mg) to healthy subjects receiving doxazosin (4-8 mg daily) also resulted in augmentation of the blood-pressure lowering affects of doxazosin. One subject reported symptomatic hypotension and another reported dizziness with concurrent therapy.(6) In a study, concurrent administration of a single dose of tadalafil (20 mg) to healthy subjects receiving tamsulosin (0.4 mg daily) resulted in no significant decreases in blood pressure.(6,17) Hypotension has been reported with concurrent use of terazosin and phosphodiesterase-5 inhibitors.(16) With simultaneous administration of vardenafil (10 mg) and terazosin (10 mg), 6 of 8 healthy subjects experienced a standing systolic blood pressure of less than 85 mmHg. With simultaneous vardenafil (20 mg) and terazosin (10 mg), 2 of 9 subjects experienced a standing systolic blood pressure of less than 85 mmHg. When vardenafil (20 mg) was administered 6 hours apart from terazosin (10 mg), 7 of 28 subjects experienced a standing systolic blood pressure of less than 85 mmHg.(10) With simultaneous administration of vardenafil (10 mg) and tamsulosin (0.4 mg), two of 16 subjects experienced a standing systolic blood pressure of less than 85 mmHg. When vardenafil (20 mg) was administered six hours apart from tamsulosin (0.4 mg), one of 24 subjects experienced a standing systolic blood pressure of less than 85 mmHg.(10) In a study in subjects with benign prostatic hyperplasia (BPH) on stable tamsulosin or terazosin therapy, simultaneous vardenafil (5 mg) and tamsulosin resulted in no effects on blood pressure. Simultaneous vardenafil (5 mg) with terazosin resulted in hypotension in some subjects. This effect did not occur when vardenafil and terazosin were separated by 6 hours.(12) In a placebo controlled, crossover study in 22 subjects with benign prostatic hyperplasia receiving tamsulosin, subjects received single doses of vardenafil (10 mg and 20 mg). No patients exhibited symptomatic hypotension. Three patients receiving 20 mg of vardenafil reported dizziness, but none had a systolic blood pressure of less than 95 mmHg.(18) In a placebo-controlled study in 24 health male subjects, administration of sildenafil (100 mg) or tadalafil (20 mg) with silodosin resulted in an increase in positive orthostatic tests in the 12 hours after concurrent administration when compared with the administration of silodosin alone. There were no reports of symptomatic orthostasis or dizziness.(19) |
ALFUZOSIN HCL ER, CARDURA, CARDURA XL, DAPIPRAZOLE HCL, DIBENZYLINE, DOXAZOSIN MESYLATE, DUTASTERIDE-TAMSULOSIN, FLOMAX, JALYN, MOXISYLYTE HCL, PHENOXYBENZAMINE HCL, PHENTOLAMINE MESYLATE, PRAZOSIN HCL, RAPAFLO, SILODOSIN, TAMSULOSIN HCL, TERAZOSIN HCL, TEZRULY, TOLAZOLINE HCL, UROXATRAL |
| Sildenafil (ED);Tadalafil (ED)/Slt Protease Inhib;Cobicistat SEVERITY LEVEL: 3-Moderate Interaction: Assess the risk to the patient and take action as needed. MECHANISM OF ACTION: The protease inhibitors may inhibit the metabolism of sildenafil and tadalafil.(1-13) CLINICAL EFFECTS: The concurrent administration of a protease inhibitor may result in elevated levels of sildenafil or tadalafil, which may result in increased adverse effects such as hypotension, visual changes, and priapism. PREDISPOSING FACTORS: None determined. PATIENT MANAGEMENT: The US manufacturers of Viagra (sildenafil, 1) and the protease inhibitors (2-11) state that the recommended dose of sildenafil, when used for erectile dysfunction, is 25 mg of sildenafil in a 48 hour period for patients receiving concurrent therapy. Patients should be counseled that they are at an increased risk of sildenafil adverse effects, including hypotension, syncope, visual changes, and priapism. Patients experiencing these effects should report them promptly to their physician. The US manufacturers of the protease inhibitors state that concurrent use of sildenafil when used for the treatment of pulmonary arterial hypertension (PAH) is contraindicated.(2-11) The US manufacturer of Revatio (sildenafil) states that concurrent use with ritonavir is not recommended.(12) The US manufacturers of tadalafil(12) and the protease inhibitors(2-10) state that the recommended dose of as needed tadalafil for the treatment of erectile dysfunction is 10 mg of tadalafil every 72 hours in patients receiving concurrent therapy. The US manufacturer of tadalafil states that the recommended dose of daily tadalafil for the treatment of erectile dysfunction in patients taking potent inhibitors of CYP3A4 is 2.5 mg.(13) The US manufacturer of tadalafil chewable tablets (Chewtadzy) states the maximum recommended dose of as needed tadalafil for erectile dysfunction in patients taking strong CYP3A4 inhibitors is 10 mg every 72 hours. The use of tadalafil chewable tablets (Chewtazdy) for once daily use for erectile dysfunction or benign prostatic hyperplasia (BPH) is not recommended in patients taking strong CYP3A4 inhibitors due to the lack of a 2.5 mg tablet strength.(14) The US manufacturers of the protease inhibitors state that in patients who have received a protease inhibitor for at least one week, the initial dosage of tadalafil for the treatment of primary pulmonary hypertension should be 20 mg daily. The dosage may be increased to 40 mg daily based upon tolerability.(2-11) The US manufacturers of the protease inhibitors state that in patients who have been receiving tadalafil for the treatment of primary pulmonary hypertension, tadalafil should be discontinued for 24 hours before beginning protease inhibitor therapy other than nelfinavir without concurrent ritonavir. After one week, tadalafil may be resumed at a dosage of 20 mg daily. The dosage may be increased to 40 mg daily based upon tolerability.(2-9) In patients who have been receiving tadalafil for the treatment of primary pulmonary hypertension, tadalafil should be adjusted to 20 mg daily prior to beginning therapy with nelfinavir without concurrent ritonavir. The dosage may be increased to 40 mg daily based upon tolerability.(10) Patients should be counseled that they are at an increased risk of tadalafil adverse effects, including hypotension, syncope, visual changes, and priapism. Patients experiencing these effects should report them promptly to their physician. DISCUSSION: In a study in 16 subjects, administration of darunavir/ritonavir (400/100 mg twice daily) decreased the area-under-curve (AUC) and maximum concentration (Cmax) of a single dose of sildenafil (25 mg) by 38% and 3%, respectively, when compared to the administration of a 100 mg single dose of sildenafil given alone.(3) In a study in 6 HIV-infected males, indinavir (800 mg every 8 hours) increased the AUC and Cmax of indinavir by 11% and 48%, respectively. Sildenafil AUC increased by 340%.(5) The concurrent administration of ritonavir (400 mg twice daily) at steady state with sildenafil (100 mg single dose) resulted in increases in the sildenafil Cmax and AUC by 300% (4-fold) and 1000% (11-fold), respectively.(1,8) After 24 hours, plasma levels of sildenafil were still approximately 200 ng/ml (normally 5 ng/ml 24 hours post-dose).(1) In a study in 27 healthy volunteers, the concurrent use of saquinavir (1200 mg 3 times daily for 8 days) increased the AUC and Cmax of a single dose of sildenafil (100 mg) by 210% and 140%, respectively.(9) In a study of 28 healthy male volunteers, the effects of sildenafil when coadministered with ritonavir were determined in 14 of these volunteers. Ritonavir showed increases in sildenafil AUC and Cmax of 11-fold and 3.9-fold respectively.(15) Concurrent administration of tipranavir/ritonavir (500/200 mg twice daily for 17 doses) had no significant effects on the AUC of a single dose of tadalafil (10 mg). Tadalafil Cmax decreased 30%. Tipranavir Cmax, AUC, and Cmin decreased by 10%, 15%, and 19%, respectively. Administration of a single dose of tipranavir/ritonavir (500/200 mg) increased the AUC of a single dose of tadalafil (10 mg) by 2.33-fold. Tadalafil Cmax decreased 22%.(9) Concurrent administration of a single dose of tadalafil (20 mg) with ritonavir (200 mg twice daily) increased tadalafil AUC by 124%.(2,7) Concurrent administration of a single dose of tadalafil (20 mg) with ritonavir (500 mg or 600 mg twice daily) increased tadalafil AUC by 32% and decreased tadalafil Cmax by 30%.(13) |
APTIVUS, ATAZANAVIR SULFATE, DARUNAVIR, EVOTAZ, FOSAMPRENAVIR CALCIUM, GENVOYA, KALETRA, LOPINAVIR-RITONAVIR, PAXLOVID, PREZCOBIX, PREZISTA, REYATAZ, STRIBILD, SYMTUZA, TYBOST, VIRACEPT |
| Tizanidine/Selected Antihypertensives SEVERITY LEVEL: 3-Moderate Interaction: Assess the risk to the patient and take action as needed. MECHANISM OF ACTION: Tizanidine is an alpha-2 agonist. Concurrent use with antihypertensive agents may result in additive effects on blood pressure.(1) CLINICAL EFFECTS: Concurrent use of antihypertensives and tizanidine may result in hypotension.(1) PREDISPOSING FACTORS: None determined. PATIENT MANAGEMENT: Patients receiving concurrent therapy should be monitored for hypotension. The risk of hypotension may be decreased by careful titration of tizanidine dosages and monitoring for hypotension prior to dose advancement. Counsel patients about the risk of orthostatic hypotension.(1) DISCUSSION: Severe hypotension has been reported following the addition of tizanidine to existing lisinopril therapy.(2-4) |
TIZANIDINE HCL, ZANAFLEX |
| Apomorphine/Selected Antihypertensives and Vasodilators SEVERITY LEVEL: 3-Moderate Interaction: Assess the risk to the patient and take action as needed. MECHANISM OF ACTION: Apomorphine causes dose-dependent decreases in blood pressure. Concurrent use with antihypertensive agents may result in additive effects on blood pressure.(1) CLINICAL EFFECTS: Concurrent use of antihypertensives and apomorphine may result in orthostatic hypotension with or without dizziness, nausea, or syncope.(1) PREDISPOSING FACTORS: The risk of orthostatic hypotension may be increased during dose escalation of apomorphine and in patients with renal or hepatic impairment.(1) PATIENT MANAGEMENT: Patients receiving concurrent therapy should be monitored for hypotension. Counsel patients about the risk of orthostatic hypotension.(1) DISCUSSION: Healthy volunteers who took sublingual nitroglycerin (0.4 mg) concomitantly with apomorphine experienced a mean largest decrease in supine systolic blood pressure (SBP) of 9.7 mm Hg and in supine diastolic blood pressure (DBP) of 9.3 mm Hg, and a mean largest decrease in standing SBP and DBP of 14.3 mm Hg and 13.5 mm Hg, respectively. The maximum decrease in SBP and DBP was 65 mm Hg and 43 mm Hg, respectively. When apomorphine was taken alone, the mean largest decrease in supine SBP and DBP was 6.1 mm Hg and 7.3 mm Hg, respectively, and in standing SBP and DBP was 6.7 mm Hg and 8.4 mm Hg, respectively.(1) |
APOKYN, APOMORPHINE HCL, ONAPGO |
The following contraindication information is available for TADALAFIL (tadalafil):
Drug contraindication overview.
Concomitant use of organic nitrates or nitrites, either regularly and/or intermittently. Concomitant use of guanylate cyclase stimulators (e.g., riociguat). Known hypersensitivity to tadalafil, finasteride, or any ingredient in the formulations. Finasteride/tadalafil fixed combination: Pregnancy.
Concomitant use of organic nitrates or nitrites, either regularly and/or intermittently. Concomitant use of guanylate cyclase stimulators (e.g., riociguat). Known hypersensitivity to tadalafil, finasteride, or any ingredient in the formulations. Finasteride/tadalafil fixed combination: Pregnancy.
There are 0 contraindications.
There are 15 severe contraindications.
Adequate patient monitoring is recommended for safer drug use.
| Severe List |
|---|
| Alcohol intoxication |
| Anterior ischemic optic neuropathy |
| Aortic valve stenosis |
| Chronic heart failure |
| Chronic kidney disease stage 3A (moderate) GFR 45-59 ml/min |
| Chronic kidney disease stage 3B (moderate) GFR 30-44 ml/min |
| Chronic kidney disease stage 4 (severe) GFR 15-29 ml/min |
| Chronic kidney disease stage 5 (failure) GFr<15 ml/min |
| Hypertrophic cardiomyopathy |
| Hypotension |
| Life-threatening cardiac arrhythmias |
| Peptic ulcer |
| Pigmentary retinopathy |
| Restrictive cardiomyopathy |
| Unstable angina pectoris |
There are 13 moderate contraindications.
Clinically significant contraindication, where the condition can be managed or treated before the drug may be given safely.
| Moderate List |
|---|
| Cerebrovascular accident |
| Fibrosis of corpus cavernosum |
| Hearing loss |
| Increased risk of bleeding |
| Increased risk of bleeding due to coagulation disorder |
| Kidney disease with likely reduction in glomerular filtration rate (GFr) |
| Leukemia |
| Multiple myeloma |
| Penile angulation |
| Peyronie's disease |
| Seizure disorder |
| Severe uncontrolled hypertension |
| Sickle cell disease |
The following adverse reaction information is available for TADALAFIL (tadalafil):
Adverse reaction overview.
Tadalafil (Cialis(R) and generic equivalents): Most common adverse effects reported in at least 2% of patients receiving tadalafil for the treatment of ED and/or BPH include headache, dyspepsia, back pain, myalgia, nasal congestion, flushing, and limb pain. Finasteride/tadalafil: Most common adverse effects associated with finasteride monotherapy (>=1%) in a 4-year study were impotence, decreased libido, decreased volume of ejaculate, breast enlargement, breast tenderness, and rash. Most common adverse effects (>=2%) associated with tadalafil were headache, dyspepsia, back pain, myalgia, nasal congestion, flushing, and limb pain.
Tadalafil (Cialis(R) and generic equivalents): Most common adverse effects reported in at least 2% of patients receiving tadalafil for the treatment of ED and/or BPH include headache, dyspepsia, back pain, myalgia, nasal congestion, flushing, and limb pain. Finasteride/tadalafil: Most common adverse effects associated with finasteride monotherapy (>=1%) in a 4-year study were impotence, decreased libido, decreased volume of ejaculate, breast enlargement, breast tenderness, and rash. Most common adverse effects (>=2%) associated with tadalafil were headache, dyspepsia, back pain, myalgia, nasal congestion, flushing, and limb pain.
There are 28 severe adverse reactions.
| More Frequent | Less Frequent |
|---|---|
| None. | None. |
| Rare/Very Rare |
|---|
|
Abnormal hepatic function tests Acute myocardial infarction Angina Anterior ischemic optic neuropathy Blurred vision Cerebrovascular accident Chest pain Conjunctivitis Dysphagia Dyspnea Esophagitis Exfoliative dermatitis Facial edema Hearing loss Hypertension Hypotension Kidney disease with reduction in glomerular filtration rate (GFr) Orthostatic hypotension Palpitations Priapism Rectal bleeding Retinal vascular occlusion Seizure disorder Stevens-johnson syndrome Syncope Tachycardia Vision impairment Visual field defect |
There are 46 less severe adverse reactions.
| More Frequent | Less Frequent |
|---|---|
|
Headache disorder |
Acute abdominal pain Anemia Back pain Cough Diarrhea Dyspepsia Flushing Gastroesophageal reflux disease Myalgia Nasal congestion Nausea Pain in extremities Pharyngitis Upper respiratory infection |
| Rare/Very Rare |
|---|
|
Acquired chromatopsia Arthralgia Conjunctival hyperemia Dizziness Drowsy Epistaxis Eye tearing Eyelid edema Fatigue Frequent erections Gastritis General weakness Hyperhidrosis Hypoesthesia Insomnia Loose stools Migraine Neck pain Ocular pain Pain Paresthesia Peripheral edema Pruritus of skin Skin rash Tinnitus Transient global amnesia Urticaria Vertigo Visual changes Vomiting Xerostomia |
The following precautions are available for TADALAFIL (tadalafil):
Use of tadalafil has not been evaluated for the treatment of BPH or ED in individuals younger than 18 years of age.
Contraindicated
Severe Precaution
Management or Monitoring Precaution
Contraindicated
| None |
Severe Precaution
| None |
Management or Monitoring Precaution
| None |
The manufacturer of tadalafil (Cialis(R)) states that the drug is not indicated for use in women. Tadalafil and/or its metabolites cross the placenta, resulting in fetal exposure in rats. In animal reproduction studies, no adverse developmental effects were observed with oral administration of tadalafil to pregnant rats or mice during organogenesis at exposures up to 11 times the maximum recommended human dose (MRHD) of 20 mg/day.
Finasteride/tadalafil: Contraindicated in pregnancy and not indicated for use in females. Based on animal studies and the mechanism of action of finasteride, finasteride/tadalafil may cause abnormal development of external genitalia in a male fetus if administered to a pregnant female. Reproduction studies in pregnant rats receiving finasteride dosages ranging from 0.1
to 86 times the MRHD of 5 mg daily resulted in dose-dependent development of hypospadias in 3.6-100% of male offspring. Pregnant rats produced male offspring with decreased prostatic and seminal vesicular weights, delayed preputial separation, and transient nipple development when given dosages 0.03
times the MRHD and decreased anogenital distance in male offspring at maternal doses approximately 0.003 times the MRHD. These effects are expected pharmacologic effects of 5alpha-reductase inhibitors and are similar to those reported in male infants with a genetic deficiency of 5alpha-reductase.
Pregnant females should not handle crushed or open finasteride/tadalafil capsules because of the potential for absorption of finasteride and the subsequent potential risk to a male fetus. Wash the contact area immediately with soap and water if contact occurs.
Finasteride/tadalafil: Contraindicated in pregnancy and not indicated for use in females. Based on animal studies and the mechanism of action of finasteride, finasteride/tadalafil may cause abnormal development of external genitalia in a male fetus if administered to a pregnant female. Reproduction studies in pregnant rats receiving finasteride dosages ranging from 0.1
to 86 times the MRHD of 5 mg daily resulted in dose-dependent development of hypospadias in 3.6-100% of male offspring. Pregnant rats produced male offspring with decreased prostatic and seminal vesicular weights, delayed preputial separation, and transient nipple development when given dosages 0.03
times the MRHD and decreased anogenital distance in male offspring at maternal doses approximately 0.003 times the MRHD. These effects are expected pharmacologic effects of 5alpha-reductase inhibitors and are similar to those reported in male infants with a genetic deficiency of 5alpha-reductase.
Pregnant females should not handle crushed or open finasteride/tadalafil capsules because of the potential for absorption of finasteride and the subsequent potential risk to a male fetus. Wash the contact area immediately with soap and water if contact occurs.
Tadalafil (Cialis(R)) and finasteride/tadalafil (Entadfi(R)) are not indicated for use in women. Tadalafil and/or its metabolites are present in the milk of lactating rats at concentrations approximately 2.4 times that found in the plasma.
Safety and efficacy of tadalafil in geriatric patients (older than 65 years of age) are similar to those in younger patients. Substantial age-related differences in pharmacokinetics of tadalafil were not observed between patients 65 years of age or older and younger individuals; therefore, the manufacturer states that modification of tadalafil dosage is not needed in geriatric patients solely on the basis of age. However, the possibility of greater sensitivity in some geriatric individuals should be considered.
The following prioritized warning is available for TADALAFIL (tadalafil):
No warning message for this drug.
No warning message for this drug.
The following icd codes are available for TADALAFIL (tadalafil)'s list of indications:
| Benign prostatic hyperplasia with lower urinary tract sx | |
| N40.1 | Benign prostatic hyperplasia with lower urinary tract symptoms |
| Erectile dysfunction | |
| F52.21 | Male erectile disorder |
| N52 | Male erectile dysfunction |
| N52.0 | Vasculogenic erectile dysfunction |
| N52.01 | Erectile dysfunction due to arterial insufficiency |
| N52.02 | Corporo-venous occlusive erectile dysfunction |
| N52.03 | Combined arterial insufficiency and corporo-venous occlusive erectile dysfunction |
| N52.1 | Erectile dysfunction due to diseases classified elsewhere |
| N52.2 | Drug-induced erectile dysfunction |
| N52.3 | Postprocedural erectile dysfunction |
| N52.31 | Erectile dysfunction following radical prostatectomy |
| N52.32 | Erectile dysfunction following radical cystectomy |
| N52.33 | Erectile dysfunction following urethral surgery |
| N52.34 | Erectile dysfunction following simple prostatectomy |
| N52.35 | Erectile dysfunction following radiation therapy |
| N52.36 | Erectile dysfunction following interstitial seed therapy |
| N52.37 | Erectile dysfunction following prostate ablative therapy |
| N52.39 | Other and unspecified postprocedural erectile dysfunction |
| N52.8 | Other male erectile dysfunction |
| N52.9 | Male erectile dysfunction, unspecified |
Formulary Reference Tool