Can I Take These?

Can You Take Doxycycline and Levothyroxine Together?

No documented interaction was identified between levothyroxine and doxycycline in the sources reviewed.

No documented interaction identifiedEvidence: Moderate

What the interaction means

Levothyroxine's FDA label does not mention doxycycline. Doxycycline's own FDA label does not mention levothyroxine.

No documented interaction was identified in the authoritative sources reviewed. This is not a guarantee that no interaction exists for every dose, formulation, or individual -- it means the sources checked did not document one.

Practical context

Both substances' own current FDA labels were checked directly, full text, in both directions.

What the sources say

Doxycycline Hyclate — FDA Prescribing Information — Sun Pharmaceutical Industries, Inc. (via DailyMed, U.S. National Library of Medicine)Levothyroxine Sodium Capsules — FDA Prescribing Information — YARAL Pharma, Inc. (via DailyMed, U.S. National Library of Medicine)

Last reviewed 2026-08-23

Medical information disclaimer: this information is general and educational. It does not diagnose conditions, prescribe treatment, or determine whether a combination is safe for you personally. Follow your prescription label and ask a pharmacist or clinician before starting, stopping, or combining products. Full disclaimer.

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