What should I watch for?
Do not switch brands of this medicine unless your health care professional agrees with the change. Ask questions if you are uncertain.
You will need regular exams and occasional blood tests to check the response to treatment. If you are receiving this medicine for an underactive thyroid, it may be several weeks before you notice an improvement. Check with your doctor or health care professional if your symptoms do not improve.
It may be necessary for you to take this medicine for the rest of your life. Do not stop using this medicine unless your doctor or health care professional advises you to.
This medicine can affect blood sugar levels. If you have diabetes, check your blood sugar as directed.
You may lose some of your hair when you first start treatment. With time, this usually corrects itself.
Common and Rare Side Effects
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 immediately if any of the following side effects occur:
Incidence not determined
difficulty in moving
dryness of the eye
dry skin and hair
fast, irregular, pounding, or racing heartbeat or pulse
feeling sad or empty
hives or welts
hoarseness or husky voice
increase in blood pressure
joint pain, stiffness or swelling
lack of appetite
lack or loss of strength
loss of interest or pleasure
muscle aching or cramping
muscle pain or stiffness
redness of skin
shakiness in legs, arms, hands, feet
shortness of breath
swelling of eyelids, face, lips, hands, or feet
tightness in chest
trembling or shaking of hands or feet
troubled breathing or swallowing
unable to sleep
unusual tiredness or weakness
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
Incidence not determined
Hair loss, thinning of hair
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.