Viagra 4-Pack Buy One Get One Free, Must-Have Hot Item for Male Enhancement and Prolonged Performance

 Viagra is an oral medication for the treatment of erectile dysfunction (ED) developed and produced by Pfizer in the United States. The main ingredient of Viagra is sildenafil, with each pill containing 100mg. Viagra is also known as "Wan Ai Ke" and has shown significant improvement effects in treating erectile dysfunction and premature ejaculation symptoms.

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

In April 1991, the clinical research on sildenafil was officially declared a failure. However, a side effect reported by trial participants caught the researchers' attention. They found that participants were unwilling to return the remaining medication after receiving the trial drugs. Upon investigation, it was discovered that this drug improved patients' sexual lives. With permission from Pfizer's senior management, researchers began studying sildenafil's effects on the smooth muscles of the penile corpus cavernosum. On March 27, 1998, it received approval from the U.S. Food and Drug Administration (FDA) for market release. It quickly achieved commercial success, with Pfizer earning $1.934 billion from it in 2008, making it a product that greatly enhanced the company's reputation.

Mechanism of Viagra:
Viagra is an oral medication for treating male erectile dysfunction. It effectively promotes blood circulation in the male body, causing rapid expansion of the penile corpus cavernosum and leading to quick, firm, and thick erections. Satisfaction with Viagra's effects and improvement in sexual ability among patients with erectile dysfunction can reach over 85%.

Target Users of Viagra:
Adult males with reduced libido, weak erections, or erectile dysfunction. After use, it quickly induces firm erections, enhances the quality of intercourse, shortens the time between subsequent sexual activities, reduces fatigue, eliminates premature ejaculation, activates kidney function, and increases testicular cell secretion.

Side Effects of Viagra:
Viagra causes side effects in approximately 2.5% of users, including mild headaches (16%), facial flushing (11%), loss of appetite (7%), and temporary visual disturbances (3%). The probability of other serious complications is less than 2%.
Common adverse reactions of 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 the relaxation of related smooth muscles.

Dosage and Administration of Viagra:
When taking Viagra, avoid using other erectile dysfunction medications simultaneously. Each pill contains 100mg. For first-time users, start with a small dose: one-quarter or one-half pill, and adjust based on individual response to the medication. If ineffective after several uses, discontinue use.

【Name】: Viagra (Wan Ai Ke)
【Ingredients】: Sildenafil 100mg per pill
【Specifications】: One box contains 4 pills / One bottle contains 30 pills
【Validity】: Three years
【Manufacturer】: Pfizer Inc., USA
【Usage】: Take one pill one hour before sexual activity.

【Precautions】: Avoid excessive use. Take once a day, one pill at a time. Do not exceed the recommended dose. If a prolonged erection occurs, rinse the penis with cold water.