Otherwise, Viagra and Viagra Connect are both taken in the same way: one tablet about an hour before sex — and only one tablet per day. Clinical trials for MED found minimal side effects. Some people may also have ringing in their ears tinnitus or dizziness. It might work longer if you have mild to moderate erectile dysfunction. These are commonly prescribed for an enlarged prostate or male pattern baldness. They include dutasteride Avodart, Jalyn and finasteride Propecia, Proscar. Sudden vision loss in one or both eyes can be a sign of a serious eye problem called non-arteritic anterior ischemic optic neuropathy NAION.Clinically proven to treat men with erectile dysfunction (ED) Ongoing commitment to product quality and safety monitoring Learn More IF YOU CHOOSE BRAND-NAME VIAGRA, MAKE SURE YOU GET THE BRAND NAME Your prescription may have been filled with a generic version instead of brand-name VIAGRA.  · The FDA has approved an over-the-counter topical gel to treat erectile dysfunction that men apply immediately before intercourse. and sildenafil (Viagra) take around 30 minutes to work. The common side effects of MED were headaches and nausea, but these occurred in only 1% to 3% of men. regardless of date, should ever . FAQs What to consider Cost Overdose Ask your doctor Q&A Drug Images What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that you take Viagra. It’s a prescription.