You should read the Pfizer Viagra information site, and advise your family physician of your intended use. Make sure there are no possible contraindications in your history and follow the doctor's advice. Have regular physical checkups.

How do I know if VIAGRA is right for me?
It's important to know that VIAGRA isn't for everyone. If you're a man who uses nitrate drugs, like GTN, (drugs commonly used for the treatment of chest pains) never take VIAGRA with any nitrate medicine, your blood pressure could suddenly drop to an unsafe or life threatening level. Viagra must never be used by men taking nitrates of any kind, any time. Other medications may interact with VIAGRA and change the way VIAGRA works. It's important to tell your doctor about any medications you take, both prescription and nonprescription. Like many medications, your Doctor may have to adjust your initial VIAGRA dosage if it doesn't produce the desired results or you're bothered by side effects.

What is Viagra for?
Viagra is approved for the treatment of men who have difficulty having and maintaining an erection (impotence).

How does Viagra work?
VIAGRA enables many men with ED to respond to sexual stimulation. When a man is sexually aroused, the arteries in the penis relax and widen, allowing more blood to flow into the penis. As the arteries in the penis expand and harden, the veins that normally carry blood away from the penis become compressed, restricting the blood flow out of the penis. With more blood flowing in and less flowing out, the penis enlarges, resulting in an erection.
If the nerves or blood vessels associated with this process aren't working properly, a man may not be able to get an erection. VIAGRA increases blood flow to the penis, so that when a man is sexually aroused, he can get and keep an erection. When the sexual encounter is over, the erection goes away.

How do I take Viagra?
Viagra is taken orally as a once daily dose, one hour before sexual activity. For more detailed information consult with your Doctor.

How will Viagra be supplied?
Viagra will be available as oral tablets in 25mg, 50mg and 100mg strengths.

Will Viagra be prescription or OTC?
Viagra will be available by prescription only.

Are there any side effects with Viagra?
As with any drug products, there are side effects of the product in some people. The most commonly reported side effects in patients treated with Viagra during the testing of the product were: headache, flushing, stomach ache, and mild and temporary visual changes (colour perception changes, light perception changes, and blurred vision).

Can Viagra be used with other treatment for impotence?
The safety and effectiveness of Viagra when used with other treatment for impotence has not been studied. The use of such treatments in combination with Viagra is not recommended at present.

What if I am taking other drugs?
Always discuss with your Doctor ALL of the medications you are taking (prescription and over-the-counter). In that way, you can receive the best advice for your own situation. At present, Viagra is not recommended for people taking nitrate medication because the combination may lower blood pressure.

What is ED?
Erectile dysfunction, or ED, is the medical term for impotence - the inability to get and/or keep an erection sufficient for satisfactory sexual activity. About 6 million men in the UK suffer from some degree of ED, including about half of all men aged 40 to 70 years.

How well does VIAGRA work?
VIAGRA improves erections in up to 4 of 5 men who take it, regardless of how long they have had ED, what caused it, or how old they are.

Will VIAGRA work as soon as I take it?
Take VIAGRA about 1 hour before engaging in sexual activity. For most patients, beginning in about 30 minutes and lasting up to 4 hours, VIAGRA can help you get an erection if you are sexually excited.

Does VIAGRA automatically cause an erection?
No. With VIAGRA, you must be sexually aroused to get an erection. If you take VIAGRA and are not sexually stimulated, nothing will happen-you won't get an erection just by taking the pill. VIAGRA is not a hormone. It is not an aphrodisiac. It's a prescription medication that can improve the erectile function of most men with erection problems.

How much VIAGRA can I take?
VIAGRA comes in different doses (50 mg, and 100 mg). Like many medications, your Doctor may have to adjust your initial VIAGRA dose if it doesn't produce the desired results or you're bothered by side effects. Do not take more VIAGRA than your Doctor prescribes, and do not take VIAGRA more than once a day.
If you are older than 65 years, have a serious liver or kidney problem, or are taking protease inhibitors, such as for the treatment of HIV, your Doctor may start you at the lowest dose of VIAGRA.

How often can I take VIAGRA?
For most patients, VIAGRA should not be taken more than once a day. In patients taking certain protease inhibitors (such as for the treatment of HIV), it is recommended to not exceed a maximum single dose of 25 mg of VIAGRA in a 48-hour period.

Who should not take VIAGRA?
VIAGRA is only for patients with ED. VIAGRA is not for newborns, children, or women. Do not let anyone else take your VIAGRA. VIAGRA must be used only under a Doctor's supervision.
Before you start any treatment of VIAGRA, be sure to ask your Doctor if your heart is healthy enough. If you're a man who uses nitrate drugs, like GTN, never take VIAGRA. The combination of VIAGRA and nitrates can make your blood pressure suddenly drop to unsafe levels. You could get dizzy, faint, or even have a heart attack or stroke. Nitrates are found in many prescription medications that are used to treat angina (chest pain due to heart disease) such as:
Nitroglycerin (sprays, ointments, skin patches or pastes, and tablets that are swallowed or dissolved in the mouth) Isosorbide mononitrate and isosorbide dinitrate (tablets that are swallowed, chewed, or dissolved in the mouth) Nitrates are also found in recreational drugs such as amyl nitrate or nitrite ("poppers"). If you are not sure if any of your medications contain nitrates, or if you do not understand what nitrates are, ask your Doctor or pharmacist.