Synthroid (levothyroxine) is a replacement medicine for a hormone normally produced by the thyroid gland in the body (this hormone is responsible for regulating your body's energy and metabolism). Another way Synthroid can be used is to prevent enlarged thyroid gland - this condition can be caused by a surgery, cancer or a radiation therapy. Synthroid can be taken by virtually anyone since this hormone occurs naturally in the body. However, contraindications include history of a heart attack, adrenal gland problem or thyrotoxicosis. Your doctor needs to know if you have or used to have coronary artery disease, anemia, diabetes, heart disease, history of blood clots or problems with pituitary glands.
Do not stop taking this drug suddenly if you see no changes are happening - it is normal for synthroid to take several weeks for the first results to be seen. Synthroid is FDA pregnancy category A, which means it is absolutely safe to use even if you are pregnant or breastfeeding. In most of the cases synthroid should be taken for the rest of your life. One of the long-term effects of this medicine is gradual bone loss that can lead to the development of osteoporosis.