These results demonstrated that the effect of VIAGRA on the primary endpoint was statistically non-inferior to placebo. In healthy male volunteers, there was no evidence of a clinically significant effect of azithromycin mg daily for 3 days on the systemic exposure of sildenafil or its major circulating metabolite. One-third to one-half of the subjects in these studies reported successful intercourse at least once during a 4-week, treatment-free run-in period. Sildenafil at steady state, at a dose not approved for the treatment of erectile dysfunction 80 mg t. Viagra vs. Before taking sildenafil, tell your doctor and pharmacist if you are allergic to sildenafil, any other medications, or any of the ingredients in sildenafil tablet or suspension.Dosage. The dose of Cialis you need will depend on whether you’re taking it daily or as needed. Daily doses are often between and 5 milligrams (mg). The as-needed dose is usually 10 mg but can range from 5–20 mg. The typicaldose of Viagra is 50 mg. However, the dosage can range from 25– mg. AdSay Goodbye to Performance Anxiety and Hello to Improved Sexual Stamina! Take Charge of Your Sexual Health with Our Top-Rated Male Enhancement Products!Honest & Unbiased Reviews · Over 20 Years Online · Over Products Tested. AdGet a Prescription for ED treatment, discreetly deliverED to your door.