- Viagra is a prescription drug that treats male erectile dysfunction. In a case study, men were able to achieve an erection in under 15 minutes. In some cases, an erection can last up to four hours.
- Viagra works with the male body to sustain erectile function. At the start of sexual arousal, blood vessels in the penis flood with blood and start to expand the length and girth of the penis (this is an erection). During this process, a chemical called cyclic GMP is produced. This chemical creates a buildup of blood in the penis, allowing it to enter more quickly than it can flow out. Viagra stops an enzyme that attacks cyclic GMP, to allow more cyclic GMP to build up and sustain an erection. The increase in cyclic GMP causes continued expansion in the arteries and narrowing of the veins, which means the penis remains hard and flushed with blood.
- Men generally will be able to produce an erection in as little as 10 to 40 minutes. It can continue working for up to four hours.
- During a medical emergency, it is important to disclose all medical history and information about prescription drugs you are currently taking, especially within a 24-hour period and if used in combination with Viagra. A special warning is made for patients with heart disease and those being treated for high cholesterol and high blood pressure. Pfizer Pharmaceuticals, the maker of Viagra, warns heart patients who have used Viagra within a 24-hour period not be treated with nitroglycerin. Pfizer says there have been cases where patients who received both drugs have died after developing irreversible hypotension, a severe drop in blood pressure. This warning is provided on the label and should be strictly followed. To assist doctors during a medical emergency, it is important for those taking Viagra to provide all dosage information before any treatment is received.
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