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This medication can increase your potassium levels, especially if you have kidney disease or diabetes, or are severely ill. Potassium levels must be done while you are taking this medication. If not treated, very high potassium levels can sometimes be fatal. If you notice any of the following serious side effects, tell your doctor right away: muscle weakness, slow/irregular heartbeat.

Dizziness, lightheadedness, tiredness, headache, stomach upset, or diarrhea may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. To reduce the risk of dizziness and lightheadedness, get up slowly when rising from a sitting or lying position. Remember that this medication has been prescribed because your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. This medication may cause dehydration and electrolyte imbalance. Tell your doctor right away if you have any symptoms of dehydration or electrolyte imbalance, including unusual dry mouth/thirst, muscle cramps/weakness, slow/fast/irregular heartbeat, or confusion. Tell your doctor right away if you have any serious side effects, including: signs of kidney problems (such as pain in the side/back/abdomen, painful urination, blood in the urine, change in the amount of urine), joint pain (such as big toe pain), fainting. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing. This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist. In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch. In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Some products that may interact with this drug include: drugs that may increase the level of potassium in the blood (such as amiloride, cyclosporine, eplerenone, tacrolimus, birth control pills containing drospirenone), lithium. Some products have ingredients that could raise your blood pressure or worsen your swelling. Tell your pharmacist what products you are using, and ask how to use them safely (especially cough-and-cold products, diet aids, or NSAIDs such as ibuprofen/naproxen). This medication may interfere with certain lab tests, possibly causing false test results. Make sure lab personnel and all your doctors know you use this drug.