This is important for your overall health and safety, as certain medications can negatively interact with each other or cause existing conditions to worsen. Your health and wellbeing come first. Some services offer a subscription option where they’ll send your medications every month at a discount. Read our editorial process. 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.Viagra (sildenafil) as low as. $ View other PDE5 Inhibitors. Sildenafil (Viagra, Revatio) is a moderately priced drug used to treat erection problems in men. It is also used to Missing: mail order. Buying Safely Online 3 min read If you search “buy erectile dysfunction drugs” online, you’ll bring up nearly 22 million sites. You may find well-known ED drugs for sale, as well Missing: mail order. Drug details Here are some details on sildenafil: Drug class: phosphodiesterase type 5 (PDE5) inhibitor Drug forms: oral tablet, liquid suspension, .