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 Viagra is an oral medication for erectile dysfunction (ED) developed and manufactured by Pfizer Inc., USA. The main active ingredient of Viagra is Sildenafil, with each tablet containing 100mg. Viagra is also known as: Sildenafil Citrate, used to treat erectile dysfunction and premature ejaculation with significant improvement effects.

The Origin of Viagra:
Sildenafil was developed by Pfizer Inc. at its research center in Sandwich, Kent, UK. It was initially entered into clinical trials as a PDE5 inhibitor intended for the treatment of cardiovascular diseases. Researchers hoped that Sildenafil could relax cardiovascular smooth muscle by releasing the bioactive substance nitric oxide, thereby dilating blood vessels to alleviate cardiovascular conditions. However, the first clinical trial at Morrison Hospital in Swansea showed that Sildenafil's effects on the cardiovascular system did not meet researchers' expectations, and its performance as a cardiovascular drug was disappointing, failing to become a successful therapeutic treatment.

In April 1991, the clinical research on Sildenafil was officially declared a failure, but a side effect reported by trial participants caught the researchers' attention. Researchers noticed that the treated subjects were reluctant to return the remaining trial medication. Upon investigation, they discovered that this drug improved patients' sexual performance. With permission from Pfizer's senior management, researchers began studying Sildenafil's effects on the smooth muscle of the penile corpus cavernosum. It received FDA marketing approval on March 27, 1998, and quickly achieved commercial success. In 2008, Pfizer earned $1.934 billion from this product, making it a widely renowned product for the company.

How Viagra Works:
Viagra is an oral medication for treating male erectile dysfunction. It effectively promotes blood circulation in the male body, facilitating rapid expansion of the penile corpus cavernosum, resulting in quick, firm, and thick erections. Patient satisfaction and improvement in sexual function among those with erectile dysfunction can reach over 85%.

Who Should Use Viagra:
Adult men with decreased libido, weak erections, or impotence. After use, it quickly induces firm erections, enhances sexual quality, shortens the interval between sexual encounters, reduces fatigue, eliminates premature ejaculation, activates kidney function, and boosts testosterone secretion from testicular cells.

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 probability 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 adverse reactions are caused by relaxation of related smooth muscles.

Dosage and Administration:
When taking Viagra, avoid using other sexual enhancement drugs simultaneously. Each tablet contains 100mg. For first-time users, it is recommended to start with a lower dose: take 1/4 or 1/2 tablet initially, then adjust based on individual response to the medication. If there is no effect after several uses, it is advised to discontinue use.

【Name】: Viagra (Sildenafil Citrate)
【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 persistent erection occurs, rinse the penis with cold water.