However, others work on a cash-pay basis and don’t partner with insurance companies. Some examples of nitrates are nitroglycerin Nitro-Dur, Nitrostat, others , isosorbide mononitrate Monoket and isosorbide dinitrate Bidil. Medical consultations were also taken into consideration, as PDE5 inhibitors require a valid prescription from a licensed medical provider. You’ll also need to fill out a medical questionnaire with answers about your medical history, current medications, and lifestyle habits. In some cases, ED can cause a strain on relationships and impact self-esteem.Sildenafil (Viagra). This medicine works best when you take it on an empty stomach an hour before sex. The body takes longer to absorb it after a high-fat meal or alcohol. Its effects often last for 4 to 5 hours. It might work longer if you have mild to moderate erectile dysfunction. Vardenafil. Generic Viagra (sildenafil) is an alternative to the branded Viagra drug that can be used for treating erectile dysfunction (ED). It’s now sold by many manufacturers, including online. No insurance is needed to order medications from the Optum Store after receiving your prescription. Your ED medication is also FSA/HSA eligible. The whole process is completed online, which makes.