Drug interactions
Doxycycline + Ethotoin
Severity: Minor
Doxycycline and Ethotoin: minor 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
Enzyme-inducing hydantoin anticonvulsants can shorten the half-life of doxycycline and lower its levels. Ethotoin is a weaker inducer than phenytoin, and the effect is mostly extrapolated.
What this interaction means in plain words
Doxycycline and Ethotoin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Hepatic enzyme induction by the hydantoin increases doxycycline metabolism.
What to do
Monitor clinical response to doxycycline and consider a higher or twice-daily dosing if infection responds poorly.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Doxycycline
- Acitretin + Doxycycline Contraindicated
- Aminolevulinic acid + Doxycycline Major
- Cholera vaccine + Doxycycline Major
- Doxycycline + Isotretinoin Major
- Doxycycline + Methoxyflurane Major
- Doxycycline + Microbiota Major
Frequently asked questions
Can I take Doxycycline with Ethotoin?
MediHelp rates the interaction as minor. Doxycycline and Ethotoin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Enzyme-inducing hydantoin anticonvulsants can shorten the half-life of doxycycline and lower its levels. Ethotoin is a weaker inducer than phenytoin, and the effect is mostly extrapolated.
How serious is the interaction between Doxycycline and Ethotoin?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor clinical response to doxycycline and consider a higher or twice-daily dosing if infection responds poorly.
What other medicines interact with Doxycycline?
MediHelp also lists interactions of Doxycycline with, for example, Acitretin, Aminolevulinic acid, Cholera vaccine. The full list is on the Doxycycline page.
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