National Library of Medicine. Healthcare providers have experience talking about ED and providing treatment options without any judgment or shame. A phone or video consultation is sometimes required for legal purposes. Read our editorial process. Refills: See if you can set up automatic refills or order as needed. Stendra avanafil : This is an as-needed medication taken 30 minutes before sex and can last up to six hours. This allows the smooth muscles in the penis to relax and fill with blood.Use this coupon to get this price at any CVS PHARMACY location. Expand to see all locations within your area. Tadalafil Brand names: Cialis, Adcirca. Tadalafil. Find out how tadalafil treats erectile dysfunction, pulmonary hypertension and benign prostate enlargement, and how to take it. CIALIS for Use as Needed. Creatinine clearance 30 to 50 mL/min: A starting dose of 5 mg not more than once per day is recommended, and the maximum dose is 10 mg not more than once in every 48 hours. Creatinine clearance less than 30 mL/min or on hemodialysis: The maximum dose is 5 mg not more than once in every 72 hours [see .