Be sure to let your doctor and pharmacist know that you are taking these medications before you start taking sildenafil. Sildenafil treats erectile dysfunction by increasing blood flow to the penis during sexual stimulation. Some services offer a subscription option where they’ll send your medications every month at a discount. There are many safe, reliable online services offering ED prescriptions. That’s not to say there aren’t just as many illegitimate sites. According to the FDA, generic medications contain the same active ingredients as brand names, meaning there’s no difference in effectiveness or safety.AdWe Have Health & Personal Care Items From Hundreds Of Popular Brands In Stock For You. Get Deals and Low Prices On viritenz On has been visited by 1M+ users in the past monthTypes: Pharmacy, VigRX Prostate Support, Natural Male Enhancement, VigRX Plus and more. Their efficacy may not have been scientifically tested to the same degree as the drugs listed in the table above. However there may be historical, cultural or anecdotal evidence linking their use to the treatment of Erectile Dysfunction. Damiana. Horny Goat Weed.  · Do not take more than one dose of Viagra per day. Doing this can increase your risk for serious side effects. Missed dose. Viagra isn’t a medication you take every day. You’ll only take a dose.