Synthetic steroid (STEAR)
Tibolone with thyroid medication (levothyroxine)
Levothyroxine is one of the most prescribed medications worldwide, and many adults on it also use chronic medications such as Tibolone (Tibolone). The combination is generally safe, but levothyroxine's narrow therapeutic index and finicky absorption mean a few practical points matter more than for most other co-administered drugs at 2.5mg.
How Tibolone affects thyroid medication
Levothyroxine absorption is sensitive to timing relative to food, calcium, iron and several medications. Whether Tibolone interferes depends on Tibolone — most agents in Synthetic steroid (STEAR) have no clinically meaningful effect on thyroid hormone levels, but a small number affect TSH or T4 free fraction. Tibolone is a prodrug; on absorption it is rapidly converted to three active metabolites (3α-OH-tibolone, 3β-OH-tibolone and Δ4-tibolone) with different tissue-selective activity.
Practical timing
According to standard endocrine practice, levothyroxine is taken on an empty stomach at least 30 minutes before food and 4 hours from interacting medications. Tibolone at 2.5mg can usually be taken at any time relative to the levothyroxine dose, but the prescribing information for Tibolone should be checked for specific timing instructions.
Frequently asked questions
Will Tibolone affect my thyroid levels? ▾
Most Synthetic steroid (STEAR) medications do not directly affect thyroid hormone levels at 2.5mg. Some affect TSH testing, hormone-binding proteins or T4 free fraction in subtle ways. Routine thyroid function tests every few months catch any meaningful drift.
When should I take Tibolone relative to levothyroxine? ▾
Levothyroxine is taken on an empty stomach with at least a 30-minute fast and 4-hour separation from interacting medications. Tibolone at 2.5mg usually has no specific timing constraint relative to levothyroxine; the pharmacist confirms based on the prescribing information for Tibolone.
Products containing Tibolone
More on Tibolone
- With alcoholTibolone and alcohol — is it safe to drink?
- With foodShould Tibolone be taken with food?
- Side effectsTibolone side effects: common, rare and warning signs
- Dosage guideTibolone dosage guide: how much to take and when
- OnsetHow fast does Tibolone start working?
- DurationHow long does Tibolone last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.