Liothyronine

When should one not use Liothyronine

• If you are allergic to liothyronine or any other ingredients of Liothyronine.
• If you have uncorrected adrenal insufficiency.

Common side effects of this drug are:

• Arrhythmias
• Myocardial infarction
• Dyspnoea
• Headache
• Nervousness
• Irritability
• Insomnia
• Tremors
• Muscle weakness
• Increased appetite
• Weight loss
• Diarrhoea
• Heat intolerance
• Menstrual irregularities
• Skin rash

Other General Warnings

• You have a heart condition or are elderly, as Liothyronine may increase your heart rate or cause chest pain or irregular heartbeat.
• You are undergoing surgery and have heart disease. Your heart rhythm needs careful monitoring while on this medication.
• You have symptoms of severe hypothyroidism (myxoedema coma), such as low body temperature, confusion, or extreme tiredness. This condition requires emergency IV treatment, not oral medicines.
• You have adrenal gland problems. Starting Liothyronine without treating adrenal insufficiency can cause a life-threatening crisis.
• You experience symptoms of too much or too little thyroid hormone, such as fatigue, weight changes, mood swings, or rapid heartbeat. Your dose may need adjusting.
• You have diabetes; this medicine can make blood sugar harder to control and may require changes to your diabetes medications.
• You are a post-menopausal woman or at risk for bone loss. Excessive liothyronine intake can lead to a reduction in bone strength over time.

How Does It Work?

Interactions with other medicines

• Take Liothyronine at least four hours apart from medications that can bind it in your stomach, such as cholestyramine, colestipol, colesevelam, Kayexalate, or sevelamer, to ensure proper absorption.
• Certain hormones and drugs, such as oestrogen pills, tamoxifen, steroids, or anticonvulsants, can change the levels of proteins that carry thyroid hormones in your blood, but this usually does not affect how you feel. Your doctor will check your lab tests regularly.
• Some medications, like phenobarbital or rifampin, may make your liver break down liothyronine faster, so your doctor may adjust your dose if you are taking them.
• Large doses of beta-blockers (e.g., propranolol), steroids (like dexamethasone), or heart medications (e.g., amiodarone) may reduce the conversion of T4 to T3 or interfere with liothyronine's action. Your thyroid levels will need close monitoring.
• If you take blood thinners (such as warfarin), Liothyronine can increase their effect, so your doctor may reduce your dose and monitor your blood clotting tests more frequently.
• Liothyronine may also affect medicines for heart conditions, such as digoxin, requiring adjustments in dosage.
• Antidepressants (like amitriptyline or sertraline) used with liothyronine may increase sensitivity to their effects; your doctor may need to adjust both doses.
• When used with pain/numbing drugs like ketamine or stimulants (e.g., adrenaline, decongestants), liothyronine may raise blood pressure or heart rate. Patients with heart disease should be monitored carefully.
• Certain cancer drugs (like imatinib) may cause low thyroid levels, so thyroid function tests should be checked regularly if these medications are used.
• Tests for thyroid hormones can be affected by changes in the levels of thyroid hormone-binding proteins. If you take oestrogens, steroids, or have liver or kidney conditions, your doctor may order "free T4 or T3" tests for accurate monitoring.

Overdose

Missed a Dose