If you have stomach or intestinal problems. If you have an overactive thyroid. If you have asthma. If you have liver disease. Studies inconclusive on harm to unborn child.
Animal studies show fetal abnormalities.
Decide with your doctor whether drug benefits justify risk to unborn child. Avoid drug or discontinue nursing until you finish medicine. Consult doctor about maintaining milk supply. Don't work around dangerous machinery. Don't climb ladders or work in high places.