sildenafil, Viagra

  • Pharmacy Author:
    Omudhome Ogbru, PharmD

    Dr. Ogbru received his Doctorate in Pharmacy from the University of the Pacific School of Pharmacy in 1995. He completed a Pharmacy Practice Residency at the University of Arizona/University Medical Center in 1996. He was a Professor of Pharmacy Practice and a Regional Clerkship Coordinator for the University of the Pacific School of Pharmacy from 1996-99.

  • Medical and Pharmacy Editor: Jay W. Marks, MD
    Jay W. Marks, MD

    Jay W. Marks, MD

    Jay W. Marks, MD, is a board-certified internist and gastroenterologist. He graduated from Yale University School of Medicine and trained in internal medicine and gastroenterology at UCLA/Cedars-Sinai Medical Center in Los Angeles.

SIDE EFFECTS: Approximately 15% of persons taking Viagra experience side effects. The most common side effects are:


Rare cases of vision changes, including sudden temporary or permanent vision loss have been reported. Phosphodiesterase-5 inhibitors have been associated rarely with non-arteritic (non-inflammatory), anterior ischemic optic neuropathy (NAION), a condition that causes decreased vision and may lead to blindness. Patients should stop use of all PDE5 inhibitors and seek medical attention if they experience sudden loss of vision in one or both eyes.

Sudden hearing loss has been reported with phosphodiesterase inhibitors such as sildenafil, sometimes with ringing in the ears and dizziness. If changes in hearing occur, patients should discontinue their sildenafil and seek immediate medical attention.

Heart attacks, stroke, and irregular heartbeats have been reported during treatment with sildenafil. Symptoms of heart attack include

Prolonged erections greater than four hours and priapism (painful penis erections greater than 6 hours in duration) rarely occur. Patients should seek immediate medical attention if such abnormal erections occur.

Sildenafil may cause edema (water retention), which causes swelling in hands, ankles, feet, or face. Shortness of breath, feeling light-headed, and fainting may also occur.



PREPARATIONS: Sildenafil (Viagra) is a blue, film-coated, rounded, diamond-shaped tablet that comes in 25, 50, and 100 mg tablets for treating impotence.

STORAGE: Tablets should be kept at room temperature between 15 C and 30 C (59 F and 86 F).

Medically Reviewed by a Doctor on 8/6/2015

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