Can I buy generic Viagra without a prescription? No. In most countries, including the United States, Viagra is not available without a prescription.It might work longer if you have mild to moderate erectile dysfunction. Side effects Side effects of oral ED medicines are often mild. Generic versions of sildenafil, vardenafil and tadalafil are available. ED can sometimes signal an underlying medical problem, like heart disease or diabetes , that needs to be treated separately. Some examples of nitrates are nitroglycerin Nitro-Dur, Nitrostat, others , isosorbide mononitrate Monoket and isosorbide dinitrate Bidil. When oral medications might not be safe Check with your health care team before you take any medicine for erectile dysfunction.Can you get Viagra without a prescription? You cannot legally get Viagra in the United States and most other countries without a prescription. The United Kingdom is one notable. Oral medications, like Viagra and Cialis, which require a prescription and are commonly used to treat ED, can take 30 minutes to take effect, she adds. Injections take less time to work, but they. 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.They’re often the first line of treatment for trouble getting or keeping an erection, called erectile dysfunction ED. You can take it in a small dose daily or in a larger dose as needed. It lasts 4 to 5 hours, or longer if you have mild to moderate ED. It works for up to 36 hours. Medicines that block an enzyme called CYP3A4. As with sildenafil, a high-fat meal or alcohol keep the body from absorbing it as quickly. This medicine works best when you take it on an empty stomach an hour before sex.

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