Progestogen / hormone replacement
Progesterone with thyroid medication (levothyroxine)
Levothyroxine is one of the most prescribed medications worldwide, and many adults on it also use chronic medications such as Progesterone (Progesterone). 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 100mg, 200mg.
How Progesterone affects thyroid medication
Levothyroxine absorption is sensitive to timing relative to food, calcium, iron and several medications. Whether Progesterone interferes depends on Progesterone — most agents in Progestogen / hormone replacement have no clinically meaningful effect on thyroid hormone levels, but a small number affect TSH or T4 free fraction. Progesterone binds to progesterone receptors and modulates gene expression in reproductive and other tissues.
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. Progesterone at 100mg, 200mg can usually be taken at any time relative to the levothyroxine dose, but the prescribing information for Progesterone should be checked for specific timing instructions.
Frequently asked questions
Will Progesterone affect my thyroid levels? ▾
Most Progestogen / hormone replacement medications do not directly affect thyroid hormone levels at 100mg, 200mg. 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 Progesterone relative to levothyroxine? ▾
Levothyroxine is taken on an empty stomach with at least a 30-minute fast and 4-hour separation from interacting medications. Progesterone at 100mg, 200mg usually has no specific timing constraint relative to levothyroxine; the pharmacist confirms based on the prescribing information for Progesterone.
Products containing Progesterone
More on Progesterone
- With alcoholProgesterone and alcohol — is it safe to drink?
- With foodShould Progesterone be taken with food?
- Side effectsProgesterone side effects: common, rare and warning signs
- Dosage guideProgesterone dosage guide: how much to take and when
- OnsetHow fast does Progesterone start working?
- DurationHow long does Progesterone last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.