Viagra treats impotency. The drug is considered to be the most sold Erectile dysfunction drug in the market.

The drug acts upon the muscles of the penis. Viagra relaxes the muscles, which helps in the increased flow of blood into the penile region. This increased blood flow helps in getting and maintaining good erection.

Always follow your doctor's direction while taking Viagra. The drug should be taken half an earlier to sex. The normal dosage is one pill a day and for some persons it could be once in three days. When taking the drug, avoid other impotency drugs. Grapefruit and grapefruit juice should be avoided as these can cause adverse side effects.

Before using Viagra, discuss with your doctor all your medical conditions so that he can take an appropriate decision on the prescription and the dosage. Tell your doctor if you have problems of the heart, kidney or liver, high or low pressure, stomach ulcer and blood cell problems.

Viagra also comes with many side effects and some of the common side effects are Chest pain, breathing difficulty, irregular heart beat, closing of throat, dizziness, vomiting, angina and swelling of face, lips or tongue.

One important thing that you should have to take care is to look for longer erections. If you have an erection that lasts for more than four hours, you should have to contact your doctor immediately as prolonged erection damages the penis.

Certain medicines are known to interact with Viagra. Therefore, it is better to inform your doctor about all the medications that you are taking before he prescribed Viagra.