In some cases, online ED providers accept health insurance. It’s available in 10 mg and 20 mg tablets. However, all medications come with risks. You’ll also need to fill out a medical questionnaire with answers about your medical history, current medications, and lifestyle habits. Common side effects include headache, facial flushing, indigestion, and dizziness. The products discussed in this site may have different product labeling in different countries.Drug Images. What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that you take Viagra. It’s a prescription drug that’s used in adult males* with ED. With ED, you. Sildenafil (Viagra, Revatio) is a moderately priced drug used to treat erection problems in men. It is also used to treat pulmonary arterial hypertension, a serious heart and lung drug is more popular than comparable drugs. It is available in generic and brand versions. Generic sildenafil is covered by most Medicare and insurance plans, but . · Generic name: sildenafil (oral) [ sil-DEN-a-fil ] Brand names: Revatio, Viagra. Drug classes: Agents for pulmonary hypertension, Impotence agents. Medically reviewed by Kaci Durbin, MD. Last updated on Uses. Warnings. Before taking. Dosage. Side effects. Interactions. FAQ. What is sildenafil?