AndroGel with thyroid medication (levothyroxine)
Levothyroxine is one of the most prescribed medications worldwide, and many adults on it also use chronic medications such as AndroGel (Testosterone). 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 1%, 1.62%.
How AndroGel affects thyroid medication
Levothyroxine absorption is sensitive to timing relative to food, calcium, iron and several medications. Whether AndroGel interferes depends on Testosterone — most agents in Hormones and Birth Control have no clinically meaningful effect on thyroid hormone levels, but a small number affect TSH or T4 free fraction. Testosterone in AndroGel is absorbed through skin, with about 10% of the applied dose entering systemic circulation.
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. AndroGel at 1%, 1.62% can usually be taken at any time relative to the levothyroxine dose, but the prescribing information for Testosterone should be checked for specific timing instructions.
Frequently asked questions
Will AndroGel affect my thyroid levels? ▾
Most Hormones and Birth Control medications do not directly affect thyroid hormone levels at 1%, 1.62%. 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 AndroGel relative to levothyroxine? ▾
Levothyroxine is taken on an empty stomach with at least a 30-minute fast and 4-hour separation from interacting medications. AndroGel at 1%, 1.62% usually has no specific timing constraint relative to levothyroxine; the pharmacist confirms based on the prescribing information for Testosterone.
More on AndroGel
- With alcoholAndroGel and alcohol — is it safe to drink?
- With foodShould AndroGel be taken with food?
- Side effectsAndroGel side effects: common, rare and warning signs
- Dosage guideAndroGel dosage guide: how much to take and when
- OnsetHow fast does AndroGel start working?
- DurationHow long does AndroGel last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.