Stop taking VIAGRA and call your healthcare provider right away if you have any sudden vision loss sudden hearing decrease or hearing loss. Men who want to switch over may ask their pharmacist for the individually-wrapped packs instead of a bottle of pills. Alpha-blockers are sometimes prescribed for prostate problems or high blood pressure. Pfizer This approach makes practical sense — men take Viagra only as needed within four hours prior to sexual intercourse. Last year, the company launched its first ad featuring a female spokesperson talking directly to men.Viagra (sildenafil) and cost. Viagra (sildenafil) is a brand-name oral tablet prescribed for erectile dysfunction. The cost of the drug with and without insurance can Missing: single packs. In most males,* Viagra works within 1 hour after it’s taken. It’s possible that Viagra can begin working within 30 minutes of being taken. But other times, it may take Missing: single packs. VIAGRA usually starts to work within minutes. If VIAGRA is right for them, men with ED can get a VIAGRA Single Packs prescription from their physician.