Drug interactions
Ketamine + Levothyroxine
Severity: Moderate
Ketamine and Levothyroxine: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Thyroid hormone increases sensitivity to catecholamines, and ketamine has sympathomimetic effects. Case reports describe marked hypertension and tachycardia when they are given together, particularly with higher thyroid doses.
What this interaction means in plain words
Ketamine and Levothyroxine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Ketamine belongs to Central Nervous System; Levothyroxine belongs to Endocrine.
Why it happens
Additive sympathomimetic stimulation, with thyroid hormone increasing adrenergic sensitivity.
What to do
Monitor blood pressure and heart rate during ketamine use, and treat hypertension or tachycardia promptly, for example with a beta-blocker. Ensure thyroid status is well controlled before elective use.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Ketamine
Other interactions of Levothyroxine
Frequently asked questions
Can I take Ketamine with Levothyroxine?
MediHelp rates the interaction as moderate. Ketamine and Levothyroxine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Thyroid hormone increases sensitivity to catecholamines, and ketamine has sympathomimetic effects. Case reports describe marked hypertension and tachycardia when they are given together, particularly with higher thyroid doses.
How serious is the interaction between Ketamine and Levothyroxine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood pressure and heart rate during ketamine use, and treat hypertension or tachycardia promptly, for example with a beta-blocker. Ensure thyroid status is well controlled before elective use.
What other medicines interact with Ketamine?
MediHelp also lists interactions of Ketamine with, for example, Benzhydrocodone / acetaminophen, Brexanolone, Buprenorphine buccal. The full list is on the Ketamine page.
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