-amiodarone
-antacids
-anti-thyroid medicines
-calcium supplements
-carbamazepine
-certain medicines for depression
-certain medicines to treat cancer
-cholestyramine
-clofibrate
-colesevelam
-colestipol
-digoxin
-female hormones, like estrogens and birth control pills, patches, rings, or injections
-iron supplements
-kayexylate
-ketamine
-liquid nutrition products like Ensure
-lithium
-medicines for colds and breathing difficulties
-medicines for diabetes
-medicines or dietary supplements for weight loss
-methadone
-niacin
-orlistat
-oxandrolone
-phenobarbital or other barbiturates
-phenytoin
-rifampin
-sevelamer
-simethicone
-soy isoflavones
-steroid medicines like prednisone or cortisone
-sucralfate
-testosterone
-theophylline
-warfarin

They need to know if you have any of these conditions:

-Addison''s disease or other adrenal gland problem
-angina
-bone problems
-diabetes
-dieting or on a weight loss program
-fertility problems
-heart disease
-pituitary gland problem
-take medicines that treat or prevent blood clots
-an unusual or allergic reaction to levothyroxine, thyroid hormones, other medicines, foods, dyes, or preservatives
-pregnant or trying to get pregnant
-breast-feeding

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.

Some brands of this medicine may have a strong odor. This does not mean that the drug is spoiled.

You may lose some of your hair when you first start treatment. With time, this usually corrects itself.

If you are going to have surgery, tell your doctor or health care professional that you are taking this medicine.

Keep out of the reach of children.

Store at room temperature between 15 and 30 degrees C (59 and 86 degrees F). Protect from light and moisture. Keep container tightly closed. Throw away any unused medicine after the expiration date.