Prostaglandin analogue
Latanoprost with thyroid medication (levothyroxine)
Levothyroxine is one of the most prescribed medications worldwide, and many adults on it also use chronic medications such as Latanoprost (Latanoprost). 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 0.005%.
How Latanoprost affects thyroid medication
Levothyroxine absorption is sensitive to timing relative to food, calcium, iron and several medications. Whether Latanoprost interferes depends on Latanoprost — most agents in Prostaglandin analogue have no clinically meaningful effect on thyroid hormone levels, but a small number affect TSH or T4 free fraction. Latanoprost is a prodrug ester hydrolysed by corneal esterases to its active free acid, which selectively binds the prostaglandin F (FP) receptor.
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. Latanoprost at 0.005% can usually be taken at any time relative to the levothyroxine dose, but the prescribing information for Latanoprost should be checked for specific timing instructions.
Frequently asked questions
Will Latanoprost affect my thyroid levels? ▾
Most Prostaglandin analogue medications do not directly affect thyroid hormone levels at 0.005%. 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 Latanoprost relative to levothyroxine? ▾
Levothyroxine is taken on an empty stomach with at least a 30-minute fast and 4-hour separation from interacting medications. Latanoprost at 0.005% usually has no specific timing constraint relative to levothyroxine; the pharmacist confirms based on the prescribing information for Latanoprost.
Products containing Latanoprost
More on Latanoprost
- With alcoholLatanoprost and alcohol — is it safe to drink?
- With foodShould Latanoprost be taken with food?
- Side effectsLatanoprost side effects: common, rare and warning signs
- Dosage guideLatanoprost dosage guide: how much to take and when
- OnsetHow fast does Latanoprost start working?
- DurationHow long does Latanoprost last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.