SIDE EFFECTS: Dizziness, lightheadedness, headache, blurred vision, loss of appetite, stomach upset, diarrhea, or constipation may occur. If any of these effects persist or worsen, notify your doctor or pharmacist promptly. Remember that your doctor has prescribed this medication because he or she 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 lead to a loss of too much body water and minerals (dehydration). Tell your doctor right away if you have any of these unlikely but serious symptoms: muscle cramps, weakness, confusion, severe dizziness, drowsiness, unusual dry mouth, unusual increased thirst, nausea/vomiting, fast/irregular heartbeat, fainting, seizures. Tell your doctor right away if you have any serious side effects, including: signs of kidney problems (such as change in the amount of urine), easy bleeding/bruising, hearing loss, ringing in the ears, numbness/tingling of the arms/legs, stomach/abdominal pain, yellowing eyes/skin. 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.

PRECAUTIONS: Before using furosemide, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details. Before using this medication, tell your doctor or pharmacist your medical history, especially of: kidney disease, liver disease, gout, lupus. If you have diabetes, furosemide may make it harder to control your blood sugar levels. Monitor your blood sugar levels regularly and inform your doctor of the results. This drug may reduce the potassium levels in your blood. Ask your doctor about adding potassium to your diet. A potassium supplement may be prescribed by your doctor. This medication may make you more sensitive to the sun. Limit your time in the sun. Avoid tanning booths and sunlamps. Use sunscreen and wear protective clothing when outdoors. Tell your doctor right away if you get sunburned or have skin blisters/redness. Before having surgery, tell your doctor or dentist that you are taking this medication. This drug may make you dizzy or drowsy or blur your vision. Alcohol or marijuana can make you more dizzy or drowsy. Do not drive, use machinery, or do anything that needs alertness or clear vision until you can do it safely. Limit alcoholic beverages. Talk to your doctor if you are using marijuana. To minimize dizziness and lightheadedness, get up slowly when rising from a sitting or lying position. Babies born early (premature infants) and children may be more sensitive to certain effects of this drug, such as kidney stones. Caution is advised when using this drug in the elderly because they may be more sensitive to its effects, especially dizziness. Furosemide should be used only when clearly needed during pregnancy. Discuss the risks and benefits with your doctor. This drug passes into breast milk and may affect milk production. Consult your doctor before breast-feeding.

DRUG INTERACTIONS: Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval. Some products that may interact with this drug include: desmopressin, ethacrynic acid, 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 (such as thyroid hormone levels), possibly causing false test results. Make sure lab personnel and all your doctors know you use this drug.

OVERDOSE: If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center. Symptoms of overdose may include: a severe decrease in amount of urine, weakness, fast/irregular heartbeat.