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Understanding Viagra: How it Works and What You Need to Know
Viagra is a medication used to treat erectile dysfunction (ED) in men. Erectile dysfunction is a condition where men are unable to achieve or maintain an erection sufficient for sexual intercourse. 온라인비아그라 works by increasing blood flow to the penis, which helps men achieve and maintain an erection.

Viagra is a brand name for sildenafil citrate, a drug developed by Pfizer in the 1990s. It was originally developed as a treatment for hypertension (high blood pressure) and angina (chest pain), but during clinical trials, researchers discovered that it also had a significant effect on erections.

Viagra is a phosphodiesterase type 5 (PDE5) inhibitor. PDE5 is an enzyme that breaks down cyclic guanosine monophosphate (cGMP), a chemical that relaxes the smooth muscles in the penis and allows blood to flow into the corpus cavernosum, the spongy tissue that fills with blood during an erection. By inhibiting PDE5, Viagra increases the levels of cGMP in the penis, which helps to promote blood flow and improve erections.

Viagra comes in tablet form and is taken orally, usually about an hour before sexual activity. It is important to take the medication exactly as prescribed by a doctor, and not to exceed the recommended dosage. The recommended starting dose of Viagra is 50mg, but dosage may vary depending on the individual's needs and response to the medication.

Viagra is generally considered safe and effective, but like all medications, it can cause side effects. Some common side effects of Viagra include headache, facial flushing, indigestion, and nasal congestion. More serious side effects, such as sudden vision loss or hearing loss, are rare but can occur.

Viagra should not be taken by men who are taking nitrates, a type of medication used to treat chest pain or heart problems, as this combination can cause a dangerous drop in blood pressure. It should also not be taken by men who are taking certain medications for HIV or hepatitis C, as these drugs can interact with Viagra and cause serious side effects.

It is important to talk to a doctor before taking Viagra, to ensure that it is safe and appropriate for an individual's needs. Doctors may also recommend lifestyle changes, such as exercise or changes to diet, as well as other treatments for ED, such as counseling or other medications.
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