Yes, usually. Popular ED medications found online include: Viagra sildenafil : As the first FDA-approved PDE5 inhibitor for ED, sildenafil is taken 30 minutes to four hours before sexual intercourse to help achieve and maintain an erection. However, others work on a cash-pay basis and don’t partner with insurance companies. People with heart conditions should never take ED medications without consulting a doctor. Answer: In short, the drug in Viagra, Sildenafil, dilates blood vessels at the entrance to the penis.Our average rating based on reviews. Express shipping US clinicians Starting from $ Get your treatment We’ll deliver to you in days Starting from $ . Lemonaid can prescribe sildenafil (generic Viagra), tadalafil (generic Cialis), and vardenafil (generic Levitra). You can get a prescription online following a quick and easy visit with . If you’re interested in buying Viagra online, five of the best options available are Hims, Roman, Lemonaid, Optum Store, and REX MD. Read on for full details on the process .