Although medications offer instant relief in various ailments but they do cause certain side-effects, disturbance in blood sugar being the common. This is a concern if you are a patient of diabetes. Whenever you visit a doctor, make sure they know about all the medicines, vitamins, or herbal supplements you take. A few medications that can affect your blood sugar level include Barbiturates (for controlling anxiety and depression), Corticosteroids (for treating severe asthma, organ transplant, cystic fibrosis), Birth control pills (oral contraceptive) and progesterone, Catecholamines (made by adrenaline glands), Decongestants ( contains beta-adrenergic agents), B vitamin niacin, asthma medicines, nicotinic acid etc.