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Viagra is a brand of sildenafil citrate, widely used for the treatment of erectile dysfunction and impotence.It is a brand from Pfizer Pharmaceuticals.

The medicine belongs to the drug class, PDE5 inhibitors. It is also used under different brand name for the treatment of pulmonary arterial hypertension.

It is a prescription only medicine.

You should take your doctor’s prescription, if you want to buy Viagra. If you want to buy Viagra online, then too you should have your doctor’s prescription.

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Erectile dysfunction is caused when enough blood does not reach the penis. This is because an enzyme called cGMP which is responsible for this increased blood flow is broken down by another enzyme called PDE5.

Viagra blocks this very enzyme, and thus saves enzyme cGMP from breaking down, and thus erectile dysfunction and impotence is overcome.

The dose is 25 to 100 mg depending upon the severity of the condition and tolerance of the patient.

It is to be taken between 30 minutes to 4 hours before sexual intercourse. The dose should not be more than once per day.

You should remember that this medicine does not act automatically. It needs arousal.

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Also you should not get anxious if you do not get result immediately. The medicine works for 4 hours.

Some men may take more time, while some men get result in as less time as 14 minutes. Discuss with your doctor about its usage, before you buy Viagra.

You can buy Viagra online, but do it with your doctor’s prescription. It should be remembered that fats decrease the absorption of this medicine. Preferably do not eat anything before taking the medicine, because the medicine acts best on empty stomach.

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But if you have to take meal, take it 2 hours before taking the medicine and it should be devoid of fats.

Do not get upset if you don’t succeed at first. In many men, it works for the first or second time, but some men require relaxing into sex. Therefore do not give up. Keep trying. And you should remember that in most men it can be taken as often as everyday, provided, daily dose should be only once a day.

If you have ED, Viagra can help you to get an erection, achieve harder erection and maintain erections longer.

You should remember that this medicine cannot cure ED, cannot cure or protect from sexually transmitted diseases or cannot be used as a male contraceptive. You should talk to your doctor before you buy Viagra.

Even if you buy Viagra online, you should have a talk with your doctor.

Read more about Viagra .