Thyroxine 12.5 mcg tablets (also known as levothyroxine sodium) are a prescription medication used primarily to treat an underactive thyroid gland (hypothyroidism). They work by replacing the natural thyroid hormone that your body is unable to produce in sufficient quantity. 
Key Information
  • Uses: Thyroxine is used to treat hypothyroidism, manage goiter (enlarged thyroid gland), and in the management of certain types of thyroid cancer.
  • Dosage: The 12.5 mcg (microgram) dose is one of the lowest available strengths. Your doctor determines the correct dosage based on your age, body weight, TSH (thyroid-stimulating hormone) blood test results, and overall health condition.
  • Administration: The tablet should be taken orally once daily on an empty stomach, ideally 30 to 60 minutes before your first meal, tea, or coffee, to ensure optimal absorption. Swallow it whole with a glass of water; do not crush, chew, or break it.
  • Long-Term Use: Hypothyroidism is typically a chronic condition, and treatment with thyroxine is often lifelong. Do not stop taking the medicine without consulting your doctor, as symptoms are likely to return.
  • Monitoring: Regular blood tests are necessary to monitor hormone levels and ensure the dosage is correct. 
Common Side Effects
Most side effects are associated with dosages that are too high and typically resolve once the correct dose is established. 
  • Headache
  • Nervousness or anxiety
  • Sleeplessness (insomnia)
  • Diarrhea or muscle cramps
  • Weight loss or increased appetite
  • Rapid or irregular heartbeat (palpitations) 
If you experience severe symptoms such as very high temperature, chest pain, or confusion, seek medical help immediately. 
Important Precautions
  • Interactions: Certain foods and medications can interfere with thyroxine absorption. Avoid taking iron supplements, calcium supplements, antacids, or multivitamins within four hours of your thyroxine dose.
  • Pregnancy: Thyroxine is generally safe during pregnancy and breastfeeding, but dosage adjustments are often necessary. Inform your doctor immediately if you are pregnant or planning to become pregnant.
  • Weight Loss: This medication should not be used for weight loss in individuals with normal thyroid function, as it is ineffective for that purpose and can cause serious side effects. 
Always consult with a healthcare professional regarding your specific medical condition and treatment plan. 

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