About Letrox 100mcg Tablets
Synthetic thyroid hormone
Used for
- Treats an underactive thyroid
- Helps suppress thyroid-stimulating hormone after some thyroid cancers
Usual adult dose
Usually started at 25–100 micrograms once daily; adjusted gradually using blood tests.
Usual dose in children
Individualized by age and weight; usually 10–15 micrograms/kg once daily in infants, with lower doses per kilogram as children grow.
Common side effects
- Fast or irregular heartbeat
- Shaking, nervousness, or difficulty sleeping
- Sweating or heat intolerance
- Weight loss or diarrhea
Important warnings
- Too much can cause serious heart problems and bone loss.
- Take consistently on an empty stomach; separate from iron or calcium by four hours.
- Dose needs may change with age, illness, pregnancy, or other medicines.
- Do not use for weight loss.
Pregnancy
Usually continued; requirements often increase, so thyroid tests and dose monitoring are important.
Breastfeeding
Generally compatible; usual replacement doses are considered safe.
Interactions
- Iron, calcium, and antacids can reduce absorption.
- Warfarin effects may increase when thyroid levels normalize.
- 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 It may be incomplete or out of date.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.