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Levothyroxine Sodium - T4

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Cytomel T4 Profile:

Levothyroxine Sodium belongs to the general group of medicines called thyroid hormones. They are used when the thyroid gland does not produce enough hormone. They are also used to help decrease the size of enlarged thyroid glands (known as goiter) and to treat thyroid cancer.

Use Cytomel T4 only as directed by your doctor. Do not use more or less of it, and do not use it more often than your doctor ordered. Your doctor has prescribed the exact amount your body needs and if you take different amounts, you may experience symptoms of an overactive or underactive thyroid. Take it at the same time each day to make sure it always has the same effect.

If your condition is due to a lack of thyroid hormone, you may have to take this medicine for the rest of your life. It is very important that you do not stop taking this medicine without first checking with your doctor.

Cytomel T4 Dosing:

The dose of Cytomel T4 will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of these medicines. If your dose is different, do not change it unless your doctor tells you to do so.

The number of tablets that you take depends on the strength of the medicine. The amount of thyroid hormone that you need to take every day depends on the results of your thyroid tests. However, treatment is usually started with lower doses that are increased a little at a time until you are taking the full amount. This helps prevent side effects.

Adults and teenagers - At first, 0.0125 to 0.05 milligrams (mg) once a day. Then, your doctor may increase your dose a little at a time to 0.075 to 0.125 mg a day. The dose is usually no higher than 0.15 mg once a day.

Children less than 6 months of age - The dose is based on body weight and must be determined by your doctor. The usual dose is 0.025 to 0.05 mg once a day.

Children 6 months to 12 months of age - The dose is based on body weight and must be determined by your doctor. The usual dose is 0.05 to 0.075 mg once a day.

Children 1 to 5 years of age - The dose is based on body weight and must be determined by your doctor. The usual dose is 0.075 to 0.1 mg once a day.

Children 6 to 10 years of age - The dose is based on body weight and must be determined by your doctor. The usual dose is 0.1 to 0.15 mg once a day.

Children over 10 years of age - The dose is based on body weight and must be determined by your doctor. The usual dose is 0.15 to 0.2 mg once a day.

Missed dose of Cytomel T4:

If you are using Cytomel T4 regularly and you miss a dose, use it as soon as possible. Then use any remaining doses for that day at regularly spaced intervals. Do not double doses.

Storage - To store Cytomel T4:

  • Keep out of the reach of children.
  • Store away from heat and direct light.
  • Do not store in the bathroom, near the kitchen sink, or in other damp places. Heat or moisture may cause the medicine to break down.
  • Keep the medicine from freezing. Do not refrigerate.
  • Do not keep outdated medicine or medicine no longer needed. Be sure that any discarded medicine is out of the reach of children.

Cytomel T4 Side effects:

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most common side effects persist or become bothersome:

Anxiety; diarrhea; flushing; mood swings; muscle weakness; partial, temporary hair loss; sleeplessness; stomach cramps; tiredness; vomiting.

Seek medical attention right away if any of these severe side effects occur:

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); changes in appetite; changes in menstrual periods; chest pain; difficulty breathing; excessive sweating; fast heartbeat; fever; headache; hives or skin rash; hyperactivity; inability to handle warm or hot room/weather conditions; irregular heartbeat; irritability; leg cramps; nervousness; pounding in the chest; seizures; shortness of breath; tremors; weight gain or weight loss.