Levothyroxine is used for:
Treating low thyroid hormone levels and certain types of goiters. It is also used with surgery and other medicines for managing certain types of thyroid cancer.
Levothyroxine is a thyroid hormone. It works by replacing thyroid hormone when your body does not make enough on its own.
Do NOT use levothyroxine if:
you are allergic to any ingredient in levothyroxine
you have untreated adrenal gland problems or high thyroid hormone levels
you have had a recent heart attack
Many prescription and nonprescription medicines (eg, used for infections, inflammation, aches and pains, nasal congestion, asthma, high blood pressure, irregular heartbeat or other heart problems, blood thinning, mental or mood problems, depression, diabetes, other thyroid problems, high cholesterol, hepatitis, weight loss, heartburn, birth control, hormone replacement therapy, growth hormone deficiency, cancer, seizures), and multivitamin products may interact with levothyroxine, increasing the risk of side effects or decreasing effectiveness.
All medicines may cause side effects, but many people have no, or minor, side effects. No COMMON side effects have been reported with the use of levothyroxine. Seek medical attention right away if any of these SEVERE side effects occur:
Severe allergic reactions (rash; hives; itching; difficulty breathing; flushing; tightness in the chest; swelling of the mouth, face, lips, or tongue; unusual hoarseness); changes in appetite; changes in menstrual periods; chest pain; diarrhea; excessive sweating; fast or irregular heartbeat; fever; heat intolerance; joint pain; leg cramps; mental or mood changes (eg, anxiety, irritability, nervousness); muscle weakness; seizures; severe or persistent headache or fatigue; shortness of breath; stomach cramps; tremors; trouble sleeping; unusual weight gain or weight loss; vomiting; wheezing.