ED medications can cause side effects, and it’s crucial to have access to a medical provider if needed. Psychological factors like stress, depression, or anxiety can also contribute. You should also call your insurance company to see if they cover erectile dysfunction medications. Most online pharmacies do not prescribe or refill controlled substances, like Adderall, Xanax, or oxycodone. 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.Looking to overcome erectile dysfunction problems? We reviewed and compared prices, insurance coverage, and safety from the best online ED prescription companies. This . Many medical clinics now offer remote health services where you can request a prescription online without visiting a doctor in person. Many online companies claim . Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that .