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Product Description

They believed that sildenafil would help the pulmonary blood vessels expand and relax, and allow greater blood and oxygen to circulate to working muscles, therefore improving exercise performance. The participants in the study performed both moderate exercise and a time trial (10k at sea level and 6k at high altitude) after either taking no pill, a placebo pill, or sildenafil. At sea level, no differences in performance were seen between taking sildenafil and not taking it. At high altitude, however, four of the men showed increased oxygen content of the arteries and great improvements in their time trials buy viagra uk only brands taking sildenafil. The remaining six men showed no improvements. Fanfreluche generique viagra four men who did see improvements were the same men who had been most negatively affected by the high altitude to begin with.

Therefore people who have a history of eye-related problems must exercise caution while taking the drug.

Detailed information

Maintenance: 25 to 100 mg orally once a day, as needed, 1 hour prior to sexual activity.

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Contact your doctor right away if you have an erection that lasts more than 4 hours. Viagra does not stop the spread of HIV or other sexually transmitted diseases (STDs) to others through sexual contact.]