Before taking acarbose, 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.It may be harder to control your blood sugar when your body is stressed (such as due to fever, infection, injury, or surgery). Consult your doctor because this may require a change in your treatment plan, medications, or blood sugar testing. Before using this medication, tell your doctor or pharmacist your medical history, especially of intestine/bowel problems (such as inflammatory bowel disease, blockage, ulcers), kidneyproblems, liver disease. Tell your doctor if your condition does not get better or if it gets worse (your blood sugar is too high or too low). Any medications you take for diabetes and blood-sugar control. Digoxin (Lanoxin) Diuretics (water pills) Estrogens. Isoniazid. Medicines for high blood pressure or colds. Medications to treat ADHD (attention deficit hyperactivity disorder) Oral contraceptives.