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

Origin of Viagra:
Sildenafil was developed by Pfizer at its research center in Sandwich, Kent, UK. It was originally intended as a phosphodiesterase type 5 (PDE5) inhibitor for the treatment of cardiovascular disease and entered clinical trials. Researchers hoped that Sildenafil could relax vascular smooth muscle by releasing the bioactive substance nitric oxide, thereby dilating blood vessels and alleviating cardiovascular conditions. However, the first clinical trial at Morriston Hospital in Swansea showed that Sildenafil's effect on the cardiovascular system did not meet expectations. Its performance as a cardiovascular drug was disappointing and it failed to become a successful treatment.

In April 1991, the clinical study of Sildenafil was officially declared a failure, but researchers noticed a side effect reported by subjects. They found that trial participants were reluctant to return unused medication. Investigation revealed that the drug improved patients' sexual function. With approval from Pfizer's senior management, researchers began studying Sildenafil's effects on the smooth muscle of the corpus cavernosum. It received marketing approval from the U.S. Food and Drug Administration (FDA) on March 27, 1998, and quickly achieved commercial success. In 2008, Pfizer generated $1.934 billion in profit from this product, making it a blockbuster that brought the company widespread recognition.

Mechanism of Action of Viagra:
Viagra is an oral medication for male erectile dysfunction. It effectively promotes blood circulation in the male body, rapidly expanding the corpus cavernosum of the penis, resulting in fast, hard, and thick erections. Patient satisfaction with Viagra's effectiveness and improvement in sexual function can exceed 85%.

Who Should Use Viagra:
Adult men with decreased libido, weak erections, or impotence. After use, the penis quickly becomes firm and erect, enhancing the quality of intercourse, shortening the interval between sexual encounters, reducing fatigue, eliminating premature ejaculation, activating kidney function, and promoting 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%), loss of appetite (7%), and temporary visual disturbance (3%). The probability of other serious complications is less than 2%.
Common adverse reactions include: dizziness, nasal congestion, indigestion, and temporary visual abnormalities such as difficulty distinguishing blue/green colors, increased light sensitivity, or blurred vision. Most of these side effects are due to the relaxation of related smooth muscles.

Dosage and Administration of Viagra:
When taking Viagra, avoid using other sexual enhancement medications simultaneously. Each tablet contains 100mg. For first-time use, start with a low dose: 1/4 or 1/2 tablet, then adjust based on individual response. If no effect is observed after several uses, it is recommended to 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. Take 1 tablet per dose.

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