During longer fasts, the reduced intake of food often lowers blood glucose. If you take the same dose of medication as you would on a normal eating day, there is a high risk of becoming hypoglycemic, which is very dangerous. Symptoms of hypoglycemia include confusion, sweating, and tremors. You may also experience a feeling of hunger, shakiness, or weakness. Left untreated, it may advance to loss of consciousness, seizures, and, in extreme cases, death.
