Uses
Viagra is phosphodiesterase inhibitor which used for erectile dysfuction treatment. Viagra enables much better erection, but sexual stimulation is necessary in order to achieve results.

The blood stream is rushed into penis, which serve the purpose of prolonged erections. Viagra's effect lasts from 4 to 6 hours.

Dosage
Please consult with your doctor about proper dosage for you.
Viagra can be taken once in 24 hours. Regular dose is 50 mg one hour before sexual activity.

Side effects
Hypotension, ventricular arrhythmias, hypotension are some of the serious but rare genre of side effects that can occur. Some people complain of cyanopsia syndrome after taking Viagra tablets. In other cases, complain comes in the form of blurriness in vision and decreased peripheral vision.

Some other common side effects which come with Viagra are headache, flushing, stomach problem, dizziness and little bit of lightheadedness fatigue.

Drug precautions
Being inhibitors, they tend to give lightheadedness feeling and little bit of dizziness. So one should not lift up or lay down suddenly. Just you need to be bit more smooth and alert.
Women and children needn't use Viagra tablets, as it is not potent.

Drug interactions
Alpha blocker when taken along with Viagra can potentially cause hypotension, retinal disorder, stroke problem, hepatic impairment.

There can be some kind of serious drug interaction between Viagra and nitrate medicines. In case of high dosage nitrate medicines such as Sordid, ISMO, Nitro-dur can cause serious fainting and even low BP.

Similarly grape juice, fatty food and alcohol should be avoided while taking Viagra.

Intake of the above mentioned can cause serious side effects and health problems.