Its effects often last for 4 to 5 hours. This boosts blood flow and helps you get an erection from sexual activity. Avanafil Stendra. 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. Some people may also have ringing in their ears tinnitus or dizziness. Medicines that you take by mouth are called oral medicines. Severe liver disease.And while generic Revatio is available only in a mg strength—Viagra comes in , , and mg tabs—not to worry: Your doctor can prescribe the most . 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 . Q&A Drug Images What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that you take Viagra. It’s a prescription drug that’s used in .

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