Thyroid Hormones (Systemic)

Side Effects of This Medicine

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor as soon as possible if any of the following side effects occur since they may indicate an overdose or an allergic reaction:

Less common or rare

Headache (severe) in children; skin rash or hives

Signs and symptoms of overdose

Chest pain; confusion; fast or irregular heartbeat; mood swings; muscle weakness; psychosis; restlessness (extreme); yellow eyes or skin; shortness of breath

For patients taking this medicine for underactive thyroid:

• This medicine usually takes several weeks to have a noticeable effect on your condition. Until it begins to work, you may experience no change in your symptoms. Check with your doctor if the following symptoms continue:

Clumsiness; coldness; constipation; dry, puffy skin; listlessness; muscle aches; sleepiness; tiredness; weakness; weight gain

Other effects may occur if the dose of the medicine is not exactly right. These side effects will go away when the dose is corrected. Check with your doctor if any of the following symptoms occur:

Changes in appetite; changes in menstrual periods; diarrhea; fever; hand tremors; headache; increased sensitivity to heat; irritability; leg cramps; nervousness; sweating; trouble in sleeping; vomiting; weight loss

Other side effects not listed above may also occur in some patients. If you notice any other effects, check with your doctor.