Bugleweed Side Effects and Warnings

Safety Issues

The safety of bugleweed has not been established. Long-term or high-dose use of the herb may cause an enlarged thyroid. Bugleweed should not be used by individuals with hypothyroidism (low thyroid hormone) or an enlarged thyroid gland. Pregnant or nursing women should also avoid bugleweed because of potential effects on their children as well as on breast milk production.

Bugleweed should not be combined with thyroid medications. It may also interfere with diagnostic procedures that rely on radioactive isotopes to evaluate the thyroid.

Interactions You Should Know About

If you are taking thyroid medications, do not use bugleweed.

If you are undergoing tests of your thyroid function, do not use bugleweed except on physician advice.