Sildenafil is used to treat pulmonary hypertension (high blood pressure in the blood vessels of your lungs), and sometimes other conditions. It improves blood flow by relaxing your blood vessels.
If you are taking sildenafil for erectile dysfunction see separate information sheet "Sildenafil (for erectile dysfunction)".
Take sildenafil regularly as directed with a glass of water. You can take it with or without food.
Measure the liquid carefully with an oral syringe or measuring spoon. Shake the bottle well before measuring each dose.
If it is nearly time for your next dose, skip the missed dose and take your next dose at the usual time. Otherwise, take the missed dose as soon as you remember. Do not take two doses at the same time.
Some medicines available without a prescription may react with sildenafil including:
Tell your pharmacist or doctor about all medicines or treatments that you may be taking, including vitamins, herbal products (e.g. St John's wort) or recreational drugs.
|Side Effects||Recommended action|
Prolonged erection (longer than four hours)
Changes in vision
|Tell your doctor immediately|
Runny or blocked nose
Muscle aches and pains
|Tell your doctor if troublesome|
If you notice any other effects, discuss them with your doctor or pharmacist.
This leaflet contains important, but not all, information about this medicine.
Prepared by the PILs Committee at Christchurch Hospital, Canterbury District Health Board, New Zealand. December 2021
For more general information about this sheet annd its contents, see: What does a My Medicines sheet cover?
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My Medicines Patient Information Leaflets (PILs) contain important, but not all, information about the medicines they describe.
For more information about the sheets, see: What does a My Medicines sheet cover?
My Medicines is developed by a team at the Canterbury District Health Board. Our team is made up of doctors, pharmacists, and a non-medical person to help us keep to plain language. We also discuss our information with specialist health professionals or groups when needed