You should also call your insurance company to see if they cover erectile dysfunction medications. Erectile dysfunction medications require a prescription from a licensed provider. Pearlman says it can often take months to get an appointment with a healthcare provider who can prescribe the medications commonly used to treat ED. An OTC drug will help patients get treatment more quickly. In some cases, ED can cause a strain on relationships and impact self-esteem. 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. We also looked at additional services, such as access to digital pharmacies and home delivery options.5 mg 10 mg 20 mg The cost for these different strengths depends on whether you have insurance, your individual plan coverage, and your treatment plan. For example, Cialis . Get started. Get Cialis and Tadalafil pill online. Try the generic Cialis option for a fraction of the cost, after speaking with one of our online medical professionals. Low price Walmart $ retail Save 94% $ Get free savings Walgreens $ retail Save 89% $ Get free savings.