Final answer:
Synthroid is associated with weight loss, but it does not have a black boxed warning.
Step-by-step explanation:
The major side effect associated with Synthroid is weight loss. Synthroid is a medication used to treat an underactive thyroid, and one of its possible side effects is unintentional weight loss.
There is no black boxed warning specifically associated with Synthroid. Black boxed warnings are the most serious warnings issued by the U.S. Food and Drug Administration (FDA) and are used for medications that have potential serious or life-threatening risks.
Learn more about Side effects of Synthroid