Read about synthroid: "Differences of only a few micrograms of Synthroid can make a large difference in how you feel. Side effects produced by Synthroid include fatigue, increased appetite, weight loss, heat intolerance, and fever. If you suffer from high blood pressure, angina or heart disease. Synthroid may rapidly swell and disintegrate resulting in choking, gagging, the tablet getting stuck in your throat, or difficulty swallowing. Synthroid is long acting and comes in a wide variety of doses that allows for individualized treatment."