It is very important that your doctor check your progress at regular visits to make sure that this medicine is working properly. Blood and urine tests may be needed to check for unwanted effects.
You should not take this medicine if you are also using atropine, benztropine (Cogentin®), glycopyrrolate (Robinul®), or a diuretic or "water pill" (such as amiloride, spironolactone, triamterene, Aldactone®, Dyrenium®, or Midamor®). Using these medicines together may cause serious problems.
Hyperkalemia (high potassium in the blood) may occur while you are using this medicine. Stop using this medicine and check with your doctor right away if you have the following symptoms: abdominal or stomach pain; confusion; difficulty with breathing; irregular heartbeat; nausea or vomiting; nervousness; numbness or tingling in the hands, feet, or lips; shortness of breath; or weakness or heaviness of the legs.
Stop using this medicine and check with your doctor right away if you have bloody or black, tarry stools; constipation; severe stomach pain; or vomiting of blood or material that looks like coffee grounds. These may be symptoms of a serious stomach problem.
Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.