Viagra, a trade names of Sildenafil citrate, is a drug used to treat erectile dysfunction and pulmonary arterial hypertension (PAH). It acts by inhibiting cGMP-specific phosphodiesterase type 5, an enzyme that promotes degradation of cGMP, which regulates blood flow in the penis. Since becoming available in 1998, sildenafil has been the prime treatment for erectile dysfunction.
Viagra is commonly referred to as a "lifestyle drug". Orgasms are initially the same intensity as normal, but the drug allows for new, strong erections minutes after orgasm, and later orgasms are delayed and more intense. Sildenafil is commonly and increasingly used as an aphrodisiac, i.e. to increase sexual desire. I-Doser Viagra dose has been designed to be the perfect compliment to sexual activity.
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