You can see an in-person provider or speak with a doctor virtually. Some examples of nitrates are nitroglycerin Nitro-Dur, Nitrostat, others , isosorbide mononitrate Monoket and isosorbide dinitrate Bidil. It’s available in 50 mg, mg, and mg tablets. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide. Your doctor or other health care professional can recommend one for you based on these factors, other health conditions you have and any other medicines you take. Common side effects include headache, facial flushing, indigestion, and dizziness.VIAGRA is available by prescription only in 25 mg, 50 mg, and mg tablets. Patients should always ask their doctors for medical advice about adverse events. You are . 1 Choose your meds Sildenafil, tadalafil, Cialis Daily, and more. 2 Answer health questions Including your blood pressure reading. 3 Medical team review Some states require a . $ Get free savings directions Closest store Rite Aid.