*This statement summarizes the third USPSTF recommendations for screening for chlamydial infection and the supporting scientific evidence, and it updates the 1995 recommendations contained in the Guide to Clinical Preventive Services, second edition (1).
What are the possible side effects of levothyroxine (Levothroid, Levoxyl, Synthroid, Tirosint, Unithroid)? Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat. Call your doctor at once if you have a serious side effect such as: headache;
Safety Considerations. 1  Thyroid hormones, including SYNTHROID, should not be used for the treatment of obesity or weight loss. 2  Do not use SYNTHROID if you have uncorrected adrenal problems. 3  Excessive amounts of levothyroxine sodium therapy have been associated with decreased bone strength, especially in women after menopause.