Acarbose slows the digestion of carbohydrates in the body, which helps control blood sugar levels. Acarbose is used to treat type 2 diabetes. Acarbose is sometimes used in combination with insulin or other diabetes medications you take by mouth. Do not use this medication if you are allergic to acarbose, or if you are in a state of diabetic ketoacidosis (call your doctor for treatment with insulin). You also should not use acarbose if you have inflammatory bowel disease, an ulcer or blockage in your intestines, or cirrhosis of the liver. Before taking acarbose, tell your doctor if you have liver disease, or any type of stomach or intestinal disorder. Take acarbose with the first bite of a main meal, unless your doctor tells you otherwise. Your medication needs may change if you become sick or injured, if you have a serious infection, or if you have any type of surgery. Do not change your dose or stop taking acarbose without first talking to your doctor. If you take acarbose with insulin or other diabetes medications, your blood sugar could get too low. Take care to keep your blood sugar from getting too low, causing hypoglycemia. You may have hypoglycemia if you skip a meal, exercise too long, drink alcohol, or are under stress. Symptoms of low blood sugar may include headache, nausea, hunger, confusion, drowsiness, weakness, dizziness, blurred vision, fast heartbeat, sweating, tremor, or trouble concentrating. Keep a supply of oral glucose (dextrose) with you in case you have low blood sugar. While you are taking acarbose, candy or table sugar (sucrose) may not work as well as dextrose in quickly raising your blood sugar. Also be sure your family and close friends know how to help you in an emergency. Acarbose is only part of a complete program of treatment that also includes diet, exercise, and weight control. It is important to use this medicine regularly to get the most benefit. Get your prescription refilled before you run out of medicine completely. Do not use this medication if you are allergic to acarbose, or if you are in a state of diabetic ketoacidosis (call your doctor for treatment with insulin). You also should not use acarbose if you have: inflammatory bowel disease a blockage in your intestines a digestive disorder affecting your intestines intestinal ulcer (of your colon) cirrhosis of the liver Before taking acarbose, tell your doctor if you are allergic to any drugs, or if you have: liver disease a bowel or intestinal disorder a stomach disorder If you have any of these conditions, you may need a dose adjustment or special tests to safely take this medication. FDA pregnancy category B. This medication is not expected to be harmful to an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant during treatment. It is not known whether acarbose passes into breast milk or if it could harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.