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Thyroxine sodium

Thyroxine sodium

Thyroxine sodium

Thyroxine sodium is a prescription drug. It comes as a tablet or capsule you take by mouth. It also comes as an injectable solution that’s only given by a healthcare provider.

Thyroxine sodium is available as the brand-name drugs Levoxyl, Synthroid, and Unithroid. It’s also available as a generic drug. Generic drugs usually cost less than the brand-name version. In some cases, they may not be available in every strength or form as the brand-name drug.

Thyroxine sodium may be used as part of a combination therapy. This means you may need to take it with other medications.

Why it's used

Thyroxine sodium is used to treat hypothyroidism. This is a condition when your thyroid gland produces too little thyroid hormone.

Thyroxine sodium also can be used to treat goiter, which is an enlarged thyroid gland. It also treats certain types of thyroid cancer.

How it works

Thyroxine sodium  belongs to a class of drugs called hormones. A class of drugs is a group of medications that work in a similar way. These drugs are often used to treat similar conditions.

Thyroxine sodium works by providing the thyroid hormone that your thyroid gland would produce if it were working normally.

Side Effects

  • Abnormal Heart Rhythm
  • Abnormal Liver Function Tests
  • Angina
  • Complete Stoppage Of The Heart
  • Fast Heartbeat
  • Giant Hives
  • Heart Attack
  • Heart Failure
  • Hives
  • Inflammation Of Skin Caused By An Allergy
  • Mood Changes
  • Pseudotumor Cerebri
  • Rash
  • Seizures
  • Trouble Breathing


Before taking l Thyroxine sodium, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: increased thyroid hormones, decreased adrenal gland function, heart disease (such as coronary artery disease, irregular heartbeat), high blood pressure, diabetes.


Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.


Missed Dose

Take the missed dose as soon as you remember it. If it is almost the time for the next scheduled dose, then the missed dose can be skipped. Do not double your dose to make up for the missed one.


Contact your doctor immediately if an overdose with this medicine is suspected. Symptoms may include a headache, shaking and trembling of hands and feet, nervousness, irritability, fast and pounding heartbeats, etc.


Warnings for special population

Pregnancy - This medicine is safe for use during pregnancy. Consult your doctor before taking this medicine.

Breast-feeding - This medicine is safe for use while breastfeeding. Consult your doctor before taking this medicine.

General warnings

Other medicines - Report the use of all medicines including dietary supplements and herbal preparations to the doctor before starting treatment with Thyrox 25 mcg Tablet since the likelihood of interactions is significantly high.