About Letrox 150mcg Tablets
Synthetic thyroid hormone
Used for
- Treats an underactive thyroid (hypothyroidism)
- Helps suppress thyroid-stimulating hormone after some thyroid cancers
Usual adult dose
Usually 25–50 micrograms once daily initially, adjusted gradually using blood tests; maintenance is often 100–200 micrograms daily.
Usual dose in children
Individualized by age, weight, and blood tests; commonly 10–15 micrograms/kg once daily in infants, with lower weight-based doses in older children.
Common side effects
- Fast or irregular heartbeat
- Shakiness, nervousness, or trouble sleeping
- Sweating or heat intolerance
- Weight loss or diarrhea
Important warnings
- Excess dosing can cause heart problems and bone loss.
- Use extra caution with heart disease or in older adults.
- Take consistently on an empty stomach; calcium and iron can reduce absorption.
- Dose changes require thyroid blood-test monitoring.
Pregnancy
Usually continued during pregnancy; dose requirements often increase, and close blood-test monitoring is important.
Breastfeeding
Generally compatible with breastfeeding at prescribed doses.
Interactions
- Calcium, iron, and antacids reduce absorption.
- Warfarin effects may increase when thyroid levels change.
- Some seizure medicines and rifampicin can reduce effectiveness.
- Food, coffee, and soy may affect absorption.
AI-generated from general medical knowledge, not from this product's official leaflet. It may be incomplete or out of date. Not medical advice — ask a pharmacist or doctor before making any decision.