Oral ED medicines might not work or might be dangerous if you also take any of the following: Nitrate medicines. If you’re not sure if you’re taking a nitrate, ask your doctor or pharmacist. When choosing one, tell your doctor or other health care professional what your preferences are, such as cost, ease of use, how long the drug’s effects last and side effects. Push the plunger of the syringe, then insert the tip into the bottle while holding the bottle upright on a flat surface. They’re often the first line of treatment for trouble getting or keeping an erection, called erectile dysfunction ED. Use only the brand of this medicine that your doctor prescribed.Viagra (sildenafil) is a brand-name prescription drug that’s used to treat erectile dysfunction (ED). Learn about side effects, warnings, dosage, and more. Sildenafil tablets for erectile dysfunction come in different strengths ranging from 25mg to mg. The usual dose is 50mg, when you need it. Do not take it more than once a day. The dose can be increased to mg or decreased to 25mg depending on its effect. Take sildenafil up to 4 hours before you want to have sex. Cialis lasts up to 36 hours in the body, while Viagra lasts 4–6 hours in the body. Both are taken 30 minutes before sex. Cialis can cause limb pain, while Viagra can cause vision change, rash.

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