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 Viagra is an oral medication developed by Pfizer in the United States for the treatment of erectile dysfunction (ED). Its main ingredient is Sildenafil, with each tablet containing 100mg. Also known as Viagra, it is highly effective in treating erectile dysfunction and premature ejaculation symptoms.

Origin of Viagra:
Sildenafil was developed by Pfizer in its research center in Sandwich, Kent, UK. It was originally intended as a phosphodiesterase type 5 inhibitor for treating cardiovascular diseases and entered clinical trials. Researchers hoped Sildenafil would release nitric oxide to relax cardiovascular smooth muscles, thereby dilating blood vessels and alleviating cardiovascular conditions. However, the first clinical trial at Morriston Hospital in Swansea showed that Sildenafil's cardiovascular effects did not meet 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 reported side effect caught researchers' attention. They found that trial participants were reluctant to return unused medication. Upon investigation, it was discovered that the drug improved patients' sexual performance. With Pfizer management's approval, researchers studied Sildenafil's effects on penile corpus cavernosum smooth muscle. It received FDA approval on March 27, 1998, and quickly achieved commercial success, generating $1.934 billion in profit for Pfizer in 2008, making it a blockbuster product for the company.

Mechanism of Action:
Viagra is an oral medication for treating male erectile dysfunction. It effectively promotes blood circulation in the male body, rapidly expanding the penile corpus cavernosum, leading to quick, firm, and thick erections. Over 85% of ED patients report satisfaction with Viagra's effectiveness and improvement in sexual performance.

Suitable Users:
Adult males with decreased libido, weak erections, or impotence. It quickly induces firm erections, enhances sexual quality, shortens recovery time between sessions, reduces fatigue, eliminates premature ejaculation, activates kidney function, and boosts testicular cell secretion.

Side Effects:
Viagra's side effect rate 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 include dizziness, nasal congestion, indigestion, and temporary visual abnormalities, such as blue/green color discrimination issues, increased light sensitivity, or blurred vision. These side effects are mostly due to related smooth muscle relaxation.

Dosage and Usage:
Avoid using other aphrodisiacs simultaneously with Viagra. Each tablet contains 100mg. First-time users may start with a lower dose: 1/4 or 1/2 tablet, then adjust based on individual response. If ineffective after several uses, discontinue use.

[Name]: Viagra
[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, once daily.

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