Viagra Pfizer

Viagra, the brand name for sildenafil, is primarily known as a medication for treating erectile dysfunction (ED) and pulmonary arterial hypertension. It's not intended for enhancing athletic performance or sports-related benefits. However, some athletes have mistakenly believed it might enhance endurance due to its effects on blood circulation. 

Positive Effects (outside of its intended medical use):

1. **Enhanced Blood Flow:** Viagra works by relaxing blood vessels, improving blood flow, particularly to the genital area, which helps in achieving and maintaining erections.

2. **Pulmonary Hypertension Treatment:** It's also used for treating pulmonary arterial hypertension by relaxing the blood vessels in the lungs, thereby reducing pressure.

Dosage:

For erectile dysfunction, the typical starting dose for Viagra is 50 milligrams, taken approximately one hour before sexual activity. Depending on effectiveness and tolerability, the dosage can range from 25 to 100 milligrams. It's generally advised not to take more than one dose per day.

It's essential to note that using Viagra or any similar medication without a prescription, especially for purposes unrelated to its intended use, is not recommended and can be dangerous. Misuse or overuse of Viagra can lead to adverse effects, including:

- **Cardiovascular Effects:** Fluctuations in blood pressure, heart palpitations, and potential cardiovascular complications, especially when combined with certain medications or underlying heart conditions.

- **Side Effects:** Headaches, flushing, dizziness, blurred vision, and indigestion are common side effects.

Viagra should only be used under the guidance of a healthcare professional and strictly for its intended medical purposes. Athletes seeking to improve their performance should focus on legal and safe methods such as proper training, nutrition, rest, and ethical sportsmanship. Consulting a healthcare professional for any concerns regarding sexual health or performance is advisable.