Just type Viagra in any search engine and not less than 50,000,000 results will crop up. The plethora of Viagra information online will make you close all the windows and grab a good nap before beginning the search for Viagra information again.

This page is specifically intended to give you spot on information which is not only concise but also comprehensive.

- Viagra is an erectile dysfunction drug and helps men in improving their erectile health.

- Viagra should be taken by men who have been having trouble achieving and maintaining erection, for fairly long time (more than two or three months) and on regular basis.

If however they are having morning or night erections, things are under control. Also if men are drinking too much and are stressed; taking medicines which may cause erection problems as side effect and the problem seems more occasional than regular, it may not be erectile dysfunction. In this case, you don't have erectile dysfunction and so don't need Viagra information.

- Viagra contains active ingredient called sildenafil citrate and it works by inhibiting PDE5 which is responsible for degradation of cGMP. This way Viagra helps in increasing the blood flow to penis and producing an erection.

- Viagra comes in 25mg, 50mg and 100mg dosage and it is best if you start with the lowest dosage to avoid side effects. Viagra information about dosage online may be too broad and prescribed dosage differs from person to person. So your doctor's advice is what you need to follow and you should not take Viagra information online word for word.

- Viagra is a wonder drug as many claim but that does not mean it is free from side effects. Viagra causes several side effects such as headache, flushing, dizziness, visual problems (blurred vision, blue tinge to vision), nasal congestion, palpitations, indigestion, eye pain, rash, chest pain, priapism and fainting.

- should be taken an hour before sexual activity. Viagra can be taken anytime from 4 hours to 30 minutes before sexual activity as its effects last for 4 hours. Viagra should not be taken more than once a day.

For more Viagra information you can visit any one of the numerous websites providing information about the medication online. Not only will you get detailed and helpful information, but many of these websites also allow you to do an online consultation and buy Viagra online if it is approved for you.

So before you go ahead with getting Viagra for your impotence get all the necessary Viagra information online. And don't fall for generic or herbal versions; do a proper consultation with your own doctor or online and get the original medication.