Triamterene

About triamterene

Triamterene is known as a potassium-sparing diuretic and may also sometimes be referred to as a water tablet. It is known as a potassium-sparing diuretic because, unlike some other diuretics, it does not cause your body to lose potassium.

Triamterene is used to treat oedema (water retention) which can be caused by various conditions, especially diseases of the heart or kidney. Oedema occurs when fluid leaks out of blood vessels causing swelling in the tissues of the lungs, feet or ankles.

Triamterene prevents the build-up of fluid in the body by increasing the amount of urine produced by the kidneys. It is mainly used alongside other diuretics.

Before taking triamterene

Before taking triamterene make sure your doctor or pharmacist knows:

• If you are pregnant, trying for a baby or breast-feeding.
• If you have kidney problems.
• If you have diabetes mellitus (sugar diabetes).
• If you know you have hyperkalaemia (high blood potassium).
• If you have Addison's disease (a disorder of the adrenal glands).
• If you are taking other medicines, including those available to buy without a prescription, herbal or complementary medicines.
• If you have ever had an allergic reaction to this or any other medicine.

How to take triamterene

• Before beginning treatment, read the manufacturer's printed information leaflet.
• Take triamterene exactly as directed by your doctor.
• If you are taking another diuretic you should take it at the same time as triamterene.
• Take triamterene capsules with or immediately after food.
• Triamterene will make you want to go to the toilet more often, so your doctor will usually advise you to take your dose in the morning. If you take more than one dose per day, take the second dose after lunch. Do not take any doses after 6 pm in the evening so as not to disturb your sleep.
• If you miss a dose of triamterene take it as soon as you remember. However, if it is after 6 pm in the evening, skip the missed dose and continue taking it at the usual times. Do not take two doses at the same time to make up for a missed dose.

Getting the most from your treatment

• Triamterene may cause your urine to look slightly blue in some lights - this is harmless and nothing to be concerned about.
• A diet rich in potassium should be avoided whilst taking this medicine as too much potassium can be harmful. Your doctor or pharmacist will be able to advise you on your diet. Salt substitutes also contain potassium. Do not use them while taking triamterene unless you have been instructed to do so by your doctor.
• It is important to take triamterene exactly as your doctor has instructed and not to stop taking it without speaking to your doctor first, even if you feel quite well.
• Diuretics help you to lose water. On occasions you may lose too much and become dehydrated, leaving you feeling thirsty and your skin looking and feeling dry. Let your doctor know if this happens.
• Keep your regular doctor's appointment so your progress can be monitored.
• If you are having any treatment like an operation or dental treatment, tell the person carrying out the treatment which medicines you are taking.
• If you buy any medicines, check with a pharmacist that they are safe to take with your other medicines.

Can triamterene cause problems?

Along with their useful effects all medicines can cause unwanted side-effects. These usually improve as your body adjusts to the new medicine. Speak with your doctor or pharmacist if any of the following side-effects continue or become troublesome.

If you experience any other symptoms which you think may be due to this medicine, speak with your doctor or pharmacist.

How to store triamterene

• Keep all medicines out of the reach and sight of children.
• Store in a cool, dry place, away from direct heat and light.

Important information about all medicines

References

• British National Formulary; 58th Edition (September 2009) British Medical Association and Royal Pharmaceutical Society of Great Britain, London (link to current BNF).