Thyroid hormone
Levothyroxine (Synthroid)
Levothyroxine replaces thyroid hormone in hypothyroidism. Sold as Synthroid, Levoxyl, and others.
Generic: Levothyroxine sodium
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Common dosages
- 25mcg
- 50mcg
- 75mcg
- 100mcg
- 125mcg
- 150mcg
Common uses
- Hypothyroidism
- Hashimoto thyroiditis
- Thyroid cancer (post-surgery)
Top warnings
- ⚠Take on empty stomach
- ⚠Wait 4 hours before calcium or iron
- ⚠Monitor TSH every 6-8 weeks during adjustment
- ⚠Brand vs generic switches may need re-titration
Drug interactions
| Interacting drug | Severity | Note |
|---|---|---|
| Calcium carbonate | Medium | Reduced absorption — separate by 4hr |
| Iron supplements | Medium | Reduced absorption |
| Warfarin | Medium | Enhanced anticoagulation |
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Get Scanō →Informational only. Not medical advice or a substitute for a licensed pharmacist or physician. Always confirm medication identity, dosage, and interactions with a healthcare provider before use.