How to take Viagra

Follow all directions given to you by your doctor and pharmacist carefully. They may differ from the information contained in this leaflet.

If you do not understand the instructions on the box, ask your doctor or pharmacist for help.

How much to take

Your doctor will decide the correct dose for you depending on your condition and response.

This can be one 25 mg tablet a day or one 50 mg tablet a day or one 100 mg tablet a day.

Do not take more than one dose of Viagra a day.

How to take it

Swallow the tablet whole with a full glass of water.

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When to take it

Take your dose of Viagra about one hour before you intend to have sex.

The amount of time Viagra takes to start working varies from person to person, but it normally takes between half an hour and one hour.

You may find Viagra takes longer to work if you take it with a heavy meal.

Viagra will work only if you are sexually excited.

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If you take too much (Overdose)

Immediately telephone your doctor or Poisons Information Centre (telephone 13 11 26) for advice or go to Accident and Emergency at the nearest hospital if you think that you or anyone else may have taken too much Viagra.

Do this even if there are no signs of discomfort or poisoning.

While you are taking it

Things you must do

Stop taking Viagra if you have a loss of eyesight in one or both eyes, experience loss of hearing or have an erection that persists more than 4 hours. Seek medical attention urgently.

If Viagra does not help you get an erection or if your erection does not last long enough to complete sexual intercourse, tell your doctor. In these cases, your doctor may decide that you need a higher dose.

If you are about to start taking any new medicines, especially nitrates, or Adepmas (riociguat), tell your doctor and pharmacist that you are taking Viagra.

See “Before you take Viagra” for a list of common nitrate medications.

Tell any other doctors, dentists and pharmacists who are treating you that you are taking Viagra.

Things you must not do

Do not use drugs containing amyl nitrite (sometimes called “poppers”) while you are taking Viagra.

If you get an angina attack do not take nitrate medicines to relieve the pain but tell your doctor immediately. Make sure your doctor knows you are taking Viagra.

Do not give Viagra to anyone else, even if they have the same condition as you.

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Things to be careful of

Be careful drinking alcohol while taking Viagra. Drinking alcohol can temporarily impair the ability to get an erection.

Do not drink large amounts of alcohol before sexual activity.

If you experience changes in vision, or dizziness, when taking Viagra, you should not drive or operate machinery.

Side effects

Tell your doctor or pharmacist as soon as possible if you do not feel well while you are taking Viagra.

While Viagra helps most people, it can cause some unwanted side effects in a few people. All medicines have side effects. If unwanted effects occur, most are likely to be minor and temporary. However, some may be serious and need medical attention.

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If any of the following happen, tell your doctor immediately or go to Accident and Emergency at your nearest hospital:

• signs of allergy such as shortness of breath, wheezing or difficulty breathing; swelling of the face, lips, tongue or other parts
• chest pain
• increased heart rate
• sudden decrease or loss of hearing
• seizures, fits or convulsions
• your erection is increased, painful or persists for longer than usual. If your erection continues for four hours, or sooner if there is pain, you should seek medical attention urgently
• rarely men have lost eyesight sometime after taking drugs to treat erectile dysfunction (known as impotence). If you lose eyesight in one or both eyes or experience changes in vision such as blurring, a blue colour to your vision or a greater awareness of light, seek medical attention urgentl