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Viagra's (brand name Revatio) active ingredient is sildenafil citrate, owned by Pfizer pharmaceutical company. Viagra is prescribed for erectile dysfunction (ED), helping 25 million
http://answers.ask.com/Health/Pharmacy/what_is_via...
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Sildenafil under the name Viagra is used to treat erectile dysfunction (impotence) in men.
http://www.chacha.com/question/how-is-viagra-made
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The brand- name drug Viagra is made by the pharmaceutical company Pfizer, Their corporate headquarters are in
http://www.chacha.com/question/where-is-viagra-mad...
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Viagra has been available since 1998. It has already gained a world-wide reputation, with sales of
http://www.chacha.com/question/when-was-viagra-fir...
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