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What Is Thyrox (Levothyroxine)?

Thyrox is a brand name for a medication called levothyroxine sodium. It is used to treat an underactive thyroid gland (hypothyroidism). Thyrox contains the hormone thyroxine (also known as levothyroxine), naturally produced by the thyroid gland. It helps regulate your body’s energy and metabolism by substituting the thyroid hormone not produced adequately by your thyroid gland. 

Thyrox Dosage and Storage


Thyrox has various strengths, usually measured in micrograms (mcg), such as:

  1. Thyrox 25 mcg: A lower dose is often prescribed for individuals needing mild thyroid hormone adjustment.
  2. Thyrox 50 mcg: This may be prescribed for those needing moderate thyroid hormone adjustment.

Other strengths are also available, including 75 mcg, 88 mcg, 100 mcg, 112 mcg, 125 mcg, 137 mcg, 150 mcg, 175 mcg, 200 mcg, and 300 mcg. 

How to Take?

Thyrox should be taken orally, ideally on an empty stomach, before your first meal. Your doctor will do a blood test to see what dose you need before you start taking Thyrox. Once you start taking the medicine, you will have regular blood tests to see how well it works, and the dose may be adjusted occasionally. Various factors determine a person’s dosage, including the severity of their hypothyroidism, age, weight, and response to the Thyrox 50 composition.

How to Store?

  • Store Thyrox at room temperature, away from moisture and heat.
  • Keep it in its original packaging, tightly closed.
  • Avoid exposure to direct sunlight.
  • Keep it out of reach of children and pets.
  • Check the expiration date and discard any expired medicine.
  • If you have specific storage instructions on the prescription label, follow those guidelines.

How Does Thyrox Work? 

Thyroxine, or T4, is a hormone naturally produced by the thyroid gland, constituting the initial step in the Thyrox 25 mechanism. It plays a crucial role in influencing the body’s metabolic rate, affecting the production and utilization of energy. Additionally, Thyrox 25 supports growth and development. A feedback loop involving the hypothalamus, pituitary gland, and thyroid gland regulates the production of thyroxine. 

Once released into the bloodstream, T4 undergoes conversion to its more active form, triiodothyronine (T3), in peripheral tissues. T3 binds to thyroid receptor proteins in the cell nucleus, influencing gene expression. This, in turn, activates specific genes, resulting in an increased metabolic rate within cells and a subsequent boost in energy production.

Side Effects of Thyrox 50 Tablets

Common side effects of Thyrox 50 tablets may include:

  1. Headache
  2. Insomnia
  3. Weight loss (or gain)
  4. Cardiovascular Effects (Palpitations, Increased heart rate, and Elevated blood pressure)
  5. Musculoskeletal Effects (tremors, muscle weakness or cramps)
  6. Gastrointestinal Effects (Diarrhea, Vomiting, and abdominal cramps)
  7. Endocrine Effect (menstrual irregularities in women)
  8. Allergic reactions

You must inform a healthcare professional immediately if you experience any unusual or severe side effects. To ensure normal thyroid hormone levels, levothyroxine users must take the correct dosage and monitor their thyroid levels regularly.


  1. It is not recommended to take Thyrox 50 mcg if you have an allergy to levothyroxine or any of its ingredients.
  2. If you have heart disease, high blood pressure, bleeding disorders, anemia, sugar, osteoporosis, fertility problems, or other thyroid problems, tell your doctor.
  3. Consult your doctor before taking Thyrox 50 composition if you are pregnant or breastfeeding.
  4. A regular blood test is needed to monitor the medicine’s effectiveness and ensure that you are taking the right dosage.
  5. If you take Thyrox 50 mcg, talk to your doctor before stopping it.

Levothyroxine Interactions

Thyrox 50 can interact with various medications. Some notable interactions include:

  1. Antacids (Aluminum or calcium-containing antacids)
  2. Iron Supplements (Ferrous sulfate or ferrous gluconate)
  3. Calcium Supplements (Calcium carbonate or calcium citrate)
  4. Cholestyramine (A bile acid sequestrant)
  5. Sucralfate
  6. Antidepressants (Amitriptyline or imipramine)
  7. Corticosteroids (Prednisone or dexamethasone)
  8. Blood Thinners (Warfarin or Heparin)

Always inform your healthcare provider about all medications to avoid potential interactions. Adjustments to medication dosages may be necessary.

Frequently Asked Questions

Can Thyrox 50 mcg tablets cause hair loss?

Yes, Thyrox 50 mcg, a medication for thyroid conditions, may cause hair loss in some individuals. Changes in thyroid hormone levels can affect hair growth cycles, leading to temporary hair loss. If you experience this side effect, consult your healthcare provider. Adjustments to medication dosage or additional interventions may help manage hair loss while ensuring proper thyroid function.

Is Thyrox gluten-free?

Thyrox may contain ingredients with gluten. You must check with your healthcare provider or pharmacist to confirm its gluten-free status. If you have gluten sensitivity or celiac disease, discuss alternative options with your healthcare team to ensure your medication aligns with your dietary needs.

Can I take Thyrox during pregnancy?

Yes, Thyrox can be taken during pregnancy, but it’s crucial to consult your healthcare provider. Maintaining proper thyroid function is vital for both you and your baby. Your healthcare team will monitor thyroid levels and adjust the medication dosage to ensure a healthy pregnancy. Never make changes to your thyroid medication without consulting your healthcare provider during pregnancy.

How long is Thyrox treatment typically needed?

Thyrox treatment duration varies. For some, it’s lifelong, especially for hypothyroidism. Regular monitoring ensures the right dosage. Your healthcare provider will assess thyroid function over time, adjusting medication as needed. Follow their guidance and attend regular check-ups to maintain optimal thyroid health. Individual factors, like the cause of thyroid issues, influence the duration of treatment.

Thyrox works by replacing the thyroid hormones that your thyroid gland cannot produce in a sufficient quantity, and relieves the symptoms of hypothyroidism (tiredness, weight gain, and depression).

Our Guarantee

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