Viagra relaxes the blood vessels in the penis. This allows blood
to flow into the penis causing an erection. However, it will only
help you get an erection if you're sexually stimulated. Viagra isn't
an aphrodisiac and it doesn't increase your sex drive.
How to take it
is available in three doses: 25mg, 50mg and 100mg. Your doctor
will select the dose most suitable for you. The tablet should
be swallowed whole with some water about an hour before sexual
works better on an empty stomach, so it's best to avoid having
a large meal or a lot of alcohol before taking the tablet.
takes about 20 minutes to an hour to work and is effective for
about four hours. Within this four-hour period you should be able
to get an erection in response to sexual stimulation.
Possible side effects
Side effects are generally mild and brief, with the most common
side effects being headaches and facial flushing. Less often,
men have reported indigestion, a runny nose and a blue tint to
Does it work for everyone?
Although a safe and effective drug, Viagra isn't suitable
for everyone and doesn't work in all cases. If you fall into either
category, your doctor can advise you of other effective treatment
reduces blood pressure slightly, which isn't a problem in most
men. However, this effect is greatly exaggerated if taken with
nitrate treatment, which is prescribed for angina (chest pain).
Viagra taken with this will cause a large drop in blood pressure
which could prove fatal. If you're taking nitrates, you shouldn't
isn't licensed for use in women and its safety in women hasn't
you have a heart condition it's important that you discuss your
condition and medication with your doctor before taking Viagra.
Men who have any of the following conditions should also avoid
* severe heart or liver problems
* recent stroke or heart attack
* low blood pressure
* certain rare inherited eye diseases
Remember: it's dangerous to get Viagra through the internet
or other advertised sources. Drugs from unknown sources may be
fake and if taken with some medicines (as mentioned above) the
result could be fatal.