In some cases, ED can cause a strain on relationships and impact self-esteem. Psychological factors like stress, depression, or anxiety can also contribute. Never purchase ED medications from a site or service that doesn’t require a prescription and medical documentation. Most online providers require a picture of a valid ID, a selfie showing your face, and a recent blood pressure reading taken with a home blood pressure monitor or by a medical provider. Read our editorial process. First and foremost, be sure that whichever online pharmacy you choose is legitimate, safe, and secure.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 drug that’s used in . Generic Viagra (sildenafil): $4 per 25 mg pill, $6 per 50 mg pill, $10 per mg pill; Branded Viagra: $90 per 25 mg, 50 mg, or mg pill; Generic Cialis (tadalafil): . If you’re holding out for a generic version of branded Viagra, you won’t have to wait much longer. Teva Pharmaceuticals plans to release its generic of the “little blue .