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Viagra
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Viagra isn't the first -- or the only -- game in town. Two additional drugs that work much like Viagra have been approved by the FDA: Levitra (vardenafil) and Cialis (tadalafil). Until these pills came along, the most common drug treatment for impotence consisted of injecting alprostadil (a synthetic form of a naturally-occurring chemical called prostaglandin E1) into the penis. For obvious reasons, that never caught on the way Viagra has. Prostaglandin E1 works much like Viagra, relaxing muscles and dilating blood vessels. At least two topical gel versions are in the works and may be on the market within a year or so.
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Viagra is a prescription medication and should always be used in accordance with its approved labeling. Viagra is contraindicated in patients who use nitrates in any form at any time. Viagra should be prescribed with caution in patients with recent serious cardiovascular events, strokes, or uncontrolled hypotension or hypertension. As with all ED treatments, a patient's cardiovascular status should be evaluated before beginning treatment. The most common side effects of Viagra are headaches, facial flushing and indigestion.
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Several reports of Viagra deaths have raised concern over the safety of this popular erectile dysfunction prescription medication. Pfizer's blockbuster drug, Viagra (Sildenafil citrate), received FDA approval in March 1998 to treat male impotency. Viagra has been used by over 27 million American males since its introduction on the market, though not without reports of serious side effects.
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Do not share Viagra with others, since they may have a problem that is not effectively treated by this drug. Use of this drug does not protect against sexually transmitted diseases (e.g., HIV, Hepatitis B, gonorrhea).
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Sildenafil Citrate (Generic Viagra) belongs to a group of medicines that delay the enzymes called phosphodiesterases from working too quickly. The penis is one of the areas where these enzymes work. Sildenafil Citrate is used to treat men who have erectile dysfunction (... called sexual impotence).
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It is interesting to note, that the information on drugs effectiveness, given on the official web-sites of Viagra, Cialis and Levitra, differs from the results of the study. Viagra is said to be effective in 85% of patients with ED. The site of Levitra gives the same rate of vardenafil effectiveness (85%). The web-site of tadalafil emphasizes the longest period of action (36 hours) for Cialis in comparison to the other available options without mentioning its actual effectiveness. According to the initial efficacy study, Cialis was effective for 81% of patients.
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