Aldactone

Common known side effects

In rats, spironolactone has been found to increase the risk of tumors. It is not known if spironolactone increases the chance of tumors in humans.

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor as soon as possible if any of the following side effects occur:

Rare

For amiloride, spironolactone, and triamterene

For spironolactone and triamterene only (in addition to effects listed above)

For triamterene only (in addition to effects listed above)

Signs and symptoms of too much potassium

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

less common with amiloride and triamterene

Less common

For amiloride, spironolactone, and triamterene

For amiloride and spironolactone only (in addition to effects listed above)

For amiloride only (in addition to effects listed above)

For spironolactone only (in addition to effects listed above for spironolactone)

For triamterene only (in addition to effects listed above for triamterene)

Signs and symptoms of too little sodium

For male patients: Spironolactone sometimes causes enlarged breasts in males, especially when they take large doses of it for a long time. Breasts usually decrease in size gradually over several months after this medicine is stopped. If you have any questions about this, check with your doctor.

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.