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 Viagra is an oral medication developed and produced by Pfizer in the United States for the treatment of erectile dysfunction (ED). The main ingredient of Viagra is Sildenafil, with each tablet containing 100mg. Also known as Sildenafil, it is used to treat erectile dysfunction and premature ejaculation, showing significant improvement effects.

Origin of Viagra:
Sildenafil was developed by Pfizer in its research center in Sandwich, Kent, UK. It was initially intended as a phosphodiesterase type 5 inhibitor for the treatment of cardiovascular diseases and entered clinical trials. Researchers hoped that Sildenafil could release the bioactive substance nitric oxide to relax cardiovascular smooth muscle, thereby dilating blood vessels and alleviating cardiovascular conditions. However, the first clinical trial at Morrison Hospital in Swansea showed that Sildenafil's effect on the cardiovascular system did not meet researchers' expectations, and its performance as a cardiovascular drug was disappointing, failing to become a successful treatment.

In April 1991, the clinical study of Sildenafil was officially declared a failure, but a side effect reported by participants caught researchers' attention. They found that subjects who received the trial drug were reluctant to return the remaining medication. Upon investigation, it was discovered that the drug improved patients' sexual performance. With Pfizer's senior management approval, researchers began studying Sildenafil's effect on the smooth muscle of the corpus cavernosum of the penis. It received marketing approval from the U.S. Food and Drug Administration on March 27, 1998, and quickly achieved commercial success. In 2008, Pfizer earned $1.934 billion from this product, making it a highly renowned drug for the company.

Mechanism of Action of Viagra:
Viagra is an oral medication for treating male erectile dysfunction. It effectively promotes blood circulation in the male body, facilitating rapid expansion of the corpus cavernosum of the penis, leading to quick, firm, and thick erections. Patient satisfaction and improvement in sexual ability with Viagra can reach over 85% for those with erectile dysfunction.

Suitable Users for Viagra:
Adult males with decreased libido, weak erections, or impotence. After use, it quickly induces a firm erection, enhances sexual quality, shortens the interval between sexual encounters, reduces fatigue, eliminates premature ejaculation, activates kidney function, and boosts testicular cell secretion.

Side Effects of Viagra:
The incidence of side effects from Viagra is approximately 2.5%, including mild headache (16%), facial flushing (11%), decreased appetite (7%), and temporary visual disturbances (3%). The risk of other serious complications is less than 2%.
Common adverse reactions to Viagra include dizziness, nasal congestion, indigestion, and temporary visual abnormalities, which may manifest as difficulty distinguishing blue/green colors, increased light sensitivity, or blurred vision. Most of these side effects are caused by related smooth muscle relaxation.

Dosage and Administration of Viagra:
When taking Viagra, avoid using other aphrodisiac drugs simultaneously. Each tablet contains 100mg. For first-time use, start with a small dose: 1/4 or 1/2 tablet, then adjust based on individual response. If ineffective after several uses, discontinue use.

【Name】: Viagra (Sildenafil)
【Ingredients】: Sildenafil 100mg per tablet
【Specifications】: 4 tablets per box / 30 tablets per bottle
【Shelf Life】: Three years
【Manufacturer】: Pfizer Inc., USA
【Usage】: Take 1 tablet 1 hour before sexual activity. Take 1 tablet each time.

【Precautions】: Avoid exceeding the recommended dose. Take once daily, one tablet at a time. Do not overdose. If a prolonged erection occurs, rinse the penis with cold water.