How oral medicines differ. Sildenafil (Viagra). This medicine works best when you take it on an empty stomach an hour before sex. The body takes longer to .In order to recoup some of these costs, a pharmaceutical company will take out a patent on their product. These medicines are called PDE5 inhibitors. Severe liver disease. They are the same and should therefore produce the same outcome whether you opt for the brand-name or the generic. Oral ED medicines might not work or might be dangerous if you also take any of the following: Nitrate medicines. When oral medications might not be safe Check with your health care team before you take any medicine for erectile dysfunction. · Generic name: sildenafil (oral) [ sil-DEN-a-fil ] Brand names: Revatio, Viagra Drug classes: Agents for pulmonary hypertension, Impotence agents Medically reviewed . These drugs include: nitrate drugs, such as nitroglycerin (Nitro-Dur) alpha-blocker drugs, such as prazosin (Minipress) blood pressure drugs, including amlodipine . There are generic versions of sildenafil, vardenafil, and tadalafil available, and you can get these medications via subscription services like Hims or Roman. What .How oral medicines differ Each oral medicine for ED has a slightly different chemical makeup. Once it expires, other companies can choose to sell the product under the generic name. Severe liver disease. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide. The brand-name medication, in this case Viagra, tends to be more expensive and that can be for a number of reasons.

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