Dyrenium (generic: triamterene) is a prescription medication used to treat fluid retention caused by congestive heart failure and other conditions. Dyrenium belongs to a group of drugs called diuretics ("water pills"). Specifically, it is a "potassium-sparing" diuretic which means that it works by helping the body get rid of excess fluid by increasing the amount of salt and water the kidneys remove from the blood, while still keeping potassium in the body.

Dyrenium comes in capsule form and is taken twice daily, after meals.

Common side effects of Dyrenium include headache, diarrhea, and nausea. This medication can cause dizziness. Do not drive or operate heavy machinery until you know how it affects you.