Erectile dysfunction is a condition where the penis does not harden and expand when a man is sexually excited, or when he cannot keep an erection. There are many safe, reliable online services offering ED prescriptions. Sildenafil Viagra is used to treat erectile dysfunction impotence; inability to get or keep an erection in men. Privacy: Confirm that your personal data and payment details are confidential. You can take it up to 4 hours before you want to have sex. Sorry something went wrong with your subscription Please, try again in a couple of minutes Retry. You might check out Harvard’s Catalyst site, which helps match researchers with Harvard labs.The Savings Offer and Program expire on 12/31/ For further information, call , visit test1.ru, or write: Viatris Inc., P.O. Box , Mission, KS Eligible patients may save on their VIAGRA® (sildenafil citrate) prescription with the VIAGRA savings card. Generic Viagra (sildenafil) is available as a , , , and milligram (mg) pill and in liquid form. It’s meant to be taken as needed — about an hour before sex — but shouldn’t be. There is generic Viagra now. They have 20mg and mg tablets. It’s usually $/bottle depending on your pharmacy. 2. ClandestineUs. • 5 yr. ago. Wow! What’s the name? 2.