Some examples of nitrates are nitroglycerin Nitro-Dur, Nitrostat, others , isosorbide mononitrate Monoket and isosorbide dinitrate Bidil. Its effects might last longer if you have mild to moderate ED. Medications We Prescribe:. Insurance: If you plan to use insurance, make sure the online provider accepts it. Other warning signs of an unsafe online pharmacy include outdated medication, no customer service, or suspiciously low prices. Be sure to let your doctor and pharmacist know that you are taking these medications before you start taking sildenafil.Can I buy generic Viagra online? The safest way to get a prescription for Viagra is from your doctor. You can even do this over a telehealth call (on the phone or computer) in . 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 . Looking to overcome erectile dysfunction problems? We reviewed and compared prices, insurance.