Cytomel (Liothyronine) Dosage and Side Effects
CYTOMEL is used for the treatment of mild to severe hypothyroidism and enlarged thyroid gland.
Proper Use of this medication
You should take CYTOMEL as prescribed by your doctor. Treatment is usually started with a low dose of CYTOMEL, then increased gradually according to your response.
In case of drug overdose, contact your doctor or a Poison Control Centre, or go to the emergency room of the hospital near you immediately, even if there are no symptoms.
If you miss a dose, take it as soon as you remember on the same day. Skip that dose if you do not remember until the next day.
Side effects with CYTOMEL may include symptoms of hyperthyroidism as follows: Headache, excessive sweating, fatigue, increased appetite, weight loss, fever, nervousness, anxiety, irritability, insomnia, cardiac arrhythmias (heartbeats which are irregular or too fast), angina pectoris (chest pain), diarrhea and menstrual irregularities.
Tell your doctor about any other side effect that is not included above or if you have any question. Your doctor may ask you stop taking CYTOMEL until the symptoms disappear, and re-start after one or two days at a lower dose.
Warnings and Precautions
Serious Warnings and Precautions
CYTOMEL, like other thyroid hormones, should not be used for the treatment of obesity or for weight loss, either alone or with other medicines. At normal doses, CYTOMEL does not reduce body weight and at higher doses, it can produce serious or even life-threatening side effects.
Before or While you use CYTOMEL talk to your doctor if you have the following conditions:
any heart problems, such as a heart attack, angina pectoris (chest pain)
- a history problem with thyroid (myxedema), or adrenal or pituitary gland
- kidney disease
- high blood sugar (diabetes)
- decreased development of sexual organs (hypogonadism)
- bone thinning (osteoporosis)
- pregnant or planning to become pregnant
- breast feeding
- blood clotting problem
Interactions with this medication
Before or while you use CYTOMEL tell your doctor or pharmacist about all other medications you take including medications that you bought without a prescription, vitamins, and natural products. Particularly if you are taking the following:
Blood thinner (anticoagulants)
Medications for high cholesterol levels such as lovastatin, cholestyramine, clofibarate
Medications for high blood sugar or insulin
Medications that contain estrogen such as birth control pills
Medicines that contain iodine such as radiographic contrast agents
5-fluorouracil, mitotane, tamoxifen
Tricyclic antidepressant such as imipramine
Cyokines such as interferon-alpha, interleukin-2
Resorcinol (topical products)
Some medicines may interfere with blood tests done to determine thyroid hormone levels (thyroid function tests). It is important to inform your doctor of all medicines you are taking before and at the time of blood tests.
The following drugs are known to interfere with laboratory tests performed in patients on thyroid hormone therapy:
Androgens (male hormones)
Corticosteroids (eg., prednisone, dexamethasone)
Estrogens and estrogen-containing oral contraceptives (birth control pills)
Preparations containing iodine
Salicylates (eg., aspirin)
Other related products
The above information is an educational aid only. It is not intended as medical advice for individual conditions or treatments. Talk to your doctor, nurse or pharmacist before following any medical regimen to see if it is safe and effective for you.