Viagra is one of the most popular Impotence treatment drugs for men. Sildenafil or Viagra, a patented product of Pfizer, is very effective for Erectile Dysfunction (ED) treatment. Due to psychological or physical conditions, a person cannot get an erection or is not able to hold erection during sexual intercourse. Viagra works in human body to increase the blood flow to penis thereby increasing the size and making it erect.

Viagra Dosage

Recommended dosage for Viagra is 25 mg tablet to start with. Viagra comes in 25 mg, 50 mg and 100 mg tablets. For ED, a person should take a dosage of 25 mg to 100 mg, as required, and should take drug once in a day. Viagra should be taken between 4 hours to 30 minutes before sexual intercourse.

How it works

Viagra contains Sildenafil Citrate which releases Nitric Oxide in Corpus Cavernosum of penis. Nitric oxide released binds itself to Guanylate Cycase enzyme resulting in increased cGMP. Also Sildenafil inhibits PDE5 enzyme which degrades cGMP. With increased level of cGMP, smooth muscle relaxation takes place which results in increased blood flow to penis resulting in erection. Viagra works when a person experiences sexual stimulation.

Side effects of Viagra

Though Viagra is considered to be safe for ED, some people may experience certain side effects like:

• Headache
• Flushing
• Dyspepsia
• Nasal congestion
• Impaired vision

Rare Side Effects of Viagra include:

• Priapism
• Severe hypotension
• Heart attack
• Stroke
• Increased intraocular pressure
• Sudden hearing loss.

Though Viagra is quite popular to treat male impotence, it is recommended to take the dosage after consultation with a doctor. Also you should not take Viagra if you are already taking Nitrates. If you are above 65 years old or have serious kidney or liver problem, you should consult a doctor before taking Viagra pills.

You can consult with a doctor and buy your prescription of Viagra through online pharmacies.