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27/03/1998 Viagra is approved in the US

Sildenafil, sold as the brand name Viagra among others, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension. Since becoming available in 1998, sildenafil has been a common treatment for erectile dysfunction; its primary competitors are tadalafil, trade name Cialis, and vardenafil, also known as Levitra.

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