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WebTadalafil is used to treat erectile dysfunction (ED) or to reduce symptoms of benign prostatic hyperplasia (BPH). One ‘as needed’ tablet lasts for 36 hours or tadalafil is available as a .Emling S. Tadalafil is its active ingredient and is available as a generic drug. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. It works for up to 36 hours. This boosts blood flow and helps you get an erection from sexual activity. This site is intended only for U. When the blood vessel muscle cells relax, this expands the vessel and increases blood flow; this effect is referred to as vasodilation.WebVIAGRA can cause your blood pressure to drop suddenly to an unsafe level if taken with certain other medicines. Do not take VIAGRA if you take any other medicines called «nitrates.» Nitrates are used to treat chest pain (angina). A sudden drop in blood pressure can cause you to feel dizzy, faint, or have a heart attack or stroke. WebFeb 15,  · Viagra Dosage and Use Tips for First-Timers. Viagra dosage for erectile dysfunction (ED) is usually milligrams (mg), but those over 65 may start at 25 mg. Your doctor will also need to. WebFeb 13,  · The drugs are phosphodiesterase 5 (PDE5) inhibitors, and their brand and generic names, respectively, are Viagra (sildenafil), Cialis (tadalafil), Levitra (vardenafil), and Stendra (avanafil.It works for up to 36 hours. If it is not treated right away, priapism can permanently damage your penis sudden vision loss in one or both eyes. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide. Viagra is always taken as needed, usually about an hour before sex. This leads to more blood flow to the penis, leading to stronger erections.