Yes, ED pills can cause side effects. Stendra avanafil : This is an as-needed medication taken 30 minutes before sex and can last up to six hours. Here are some key factors to consider when deciding: Pricing: Know how much your monthly supply will cost with shipping and tax. Most online pharmacies do not prescribe or refill controlled substances, like Adderall, Xanax, or oxycodone. 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. Finding an online ED provider can feel overwhelming.Online pharmacies allow you to fill prescription medications from the comfort of your home using a pharmacy site or an app rather than having to fill them in person. An online pharmacy can also offer you more cost savings and convenience. Your medications can be mailed to you directly and set to arrive on a fixed schedule (aka auto . Generic sildenafil is covered by most Medicare and insurance plans, but some pharmacy coupons or cash prices may be lower. Get sildenafil for as low as $, which is 99% off the average retail price of $ for the most common version, by . Generic Viagra (sildenafil) is an alternative to the branded Viagra drug that can be used for treating erectile dysfunction (ED). It’s now sold by many manufacturers, including online.