Be sure to mention any of the following: alpha blockers such as alfuzosin Uroxatral , doxazosin Cardura , dutasteride Avodart, in Jalyn , prazosin Minipress , silodosin Rapaflo , tamsulosin Flomax, in Jalyn , and terazosin; amiodarone Cordarone, Pacerone ; certain antifungals such as fluconazole Diflucan , griseofulvin Grifulvin, Gris-PEG , itraconazole Onmel, Sporanox , ketoconazole Extina, Ketozole, Nizoral, Xolegel , and voriconazole Vfend ; aprepitant Emend ; bosentan Tracleer ; carbamazepine Carbatrol, Epitol, Tegretol, Teril, others ; clarithromycin Biaxin, in Prevpac ; diltiazem Cardizem, Cartia,Tiazac, others ; efavirenz Sustiva, in Atripla ; erythromycin E. Your healthcare provider will discuss which dose is right for you. Tadalafil comes as a tablet to take by mouth. Comparison with actions of other PDE5 inhibitors[ edit ] Sildenafil and vardenafil inhibit PDE6, an enzyme found in the eye, more than tadalafil. What if I am taking other drugs? Tadalafil may not be safe for people with certain medical conditions, including people who have had a stroke , have coronary heart disease or retinitis pigmentosa an eye disease.This PDF document provides the full prescribing information for Cialis (tadalafil), a drug used to treat erectile dysfunction and benign prostatic hyperplasia. It includes indications, dosage, warnings, interactions, adverse reactions, and clinical studies. Cialis (branded Tadalafil) Cialis is a reliable, branded ED treatment that lasts up to 36hrs. Can be taken with food. Works in 30mins, lasts up to 36hrs. Works for 80% of men. 10mg 20mg. 4 tablets. Out of stock. 8 tablets. Roman sells the following versions of Cialis: Generic: available in tablets of 5, 10, and 20 milligrams (mg), starting from $11 Daily Generic: available in doses of and 5 mg at $8 Branded.