Sildenafil should not be taken by people on nitrates such as nitroglycerin (glycerin trinitrate), as this may result in a serious drop in blood pressure.
Rare but serious side effects include a prolonged erection (priapism) that can lead to damage to the penis, vision problems, and hearing loss. Caution is advised in those with cardiovascular disease. Ĭommon side effects include headaches, heartburn, and flushed skin.
Onset is typically within twenty minutes and lasts for about two hours. It is taken by mouth or by injection into a vein. It is unclear if it is effective for treating sexual dysfunction in women. Sildenafil, sold under the brand name Viagra, among others, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension.
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