*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).
Older adults may be more sensitive to the side effects of this drug, especially fast/pounding/irregular heartbeat. Current information shows that this drug may be used during pregnancy. Tell your doctor if you are pregnant because your dose may need to be adjusted. Levothyroxine passes into breast milk but is unlikely to harm a nursing infant.
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.