Do NOT use Glucotrol XL if:

• you are allergic to any ingredient in Glucotrol XL
• you have certain severe problems associated with diabetes (eg, diabetic ketoacidosis, diabetic coma)
• you have moderate to severe burns, or very high blood acid levels (acidosis)
• you have type 1 diabetes
• you are pregnant and are within 1 month of the expected delivery date

• if you are pregnant, planning to become pregnant, or are breast-feeding
• if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
• if you have allergies to medicines, foods, or other substances
• if you have had a severe allergic reaction (eg, a severe rash, hives, breathing difficulties, dizziness) to any other sulfonamide medicine, such as acetazolamide, celecoxib, certain diuretics (eg, hydrochlorothiazide), probenecid, sulfamethoxazole, valdecoxib, or zonisamide
• if you have a history of liver, kidney, thyroid, or heart problems
• if you have stomach or bowel problems (eg, stomach or bowel narrowing or blockage, stomach paralysis), drink alcohol, or have had poor nutrition
• if you have very poor health, a high fever, a severe infection, severe diarrhea, or high blood acid levels, or have had a severe injury
• if you have a history of certain hormonal problems (eg, adrenal or pituitary problems, syndrome of inappropriate secretion of antidiuretic hormone [SIADH]), or low blood sodium levels
• if you will be having surgery

• Beta-blockers (eg, propranolol) because the risk of low blood sugar may be increased. They may also hide certain signs of low blood sugar and make it more difficult to notice
• Angiotensin-converting enzyme (ACE) inhibitors (eg, enalapril), anticoagulants (eg, warfarin), azole antifungals (eg, miconazole, ketoconazole), chloramphenicol, clofibrate, fenfluramine, insulin, monoamine oxidase (MAO) inhibitors (eg, phenelzine), nonsteroidal anti-inflammatory medicines (NSAIDs) (eg, ibuprofen), phenylbutazone, probenecid, quinolone antibiotics (eg, ciprofloxacin), salicylates (eg, aspirin), or sulfonamides (eg, sulfamethoxazole) because the risk of low blood sugar may be increased
• Calcium channel blockers (eg, diltiazem), corticosteroids (eg, prednisone), decongestants (eg, pseudoephedrine), diazoxide, diuretics (eg, furosemide, hydrochlorothiazide), estrogens, hormonal contraceptives (eg, birth control pills), isoniazid, niacin, phenothiazines (eg, promethazine), phenytoin, rifamycins (eg, rifampin), sympathomimetics (eg, albuterol, epinephrine, terbutaline), or thyroid supplements (eg, levothyroxine) because they may decrease Glucotrol XL Extended-Release Tablets's effectiveness, resulting in high blood sugar
• Gemfibrozil because blood sugar may be increased or decreased

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:

• Diarrhea; dizziness; gas; nausea.

• Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue; skin redness; dizziness); confusion; dark urine; fainting; fever, chills, or persistent sore throat; irregular heartbeat; low blood sugar symptoms (eg, anxiety, drowsiness, fast heartbeat, headache, lightheadedness, severe or persistent dizziness, tremors, unusual sweating, weakness); severe or persistent blurred vision or other vision problems; unusual bruising or bleeding; unusual tiredness or weakness; yellowing of the eyes or skin.

If you have any questions about Glucotrol XL, please talk with your doctor, pharmacist, or other health care provider.
Glucotrol XL is to be used only by the patient for whom it is prescribed. Do not share it with other people.
If your symptoms do not improve or if they become worse, check with your doctor.

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