Drug interactions
Doxycycline + Pentobarbital
Severity: Moderate
Doxycycline and Pentobarbital: 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
Barbiturates induce hepatic enzymes and can shorten the half-life of doxycycline, lowering its concentrations. This may lead to subtherapeutic antibiotic exposure and treatment failure, particularly with prolonged barbiturate use.
What this interaction means in plain words
Doxycycline and Pentobarbital 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.
Why it happens
Barbiturate induction of hepatic microsomal enzymes accelerates doxycycline metabolism.
What to do
Monitor clinical response to doxycycline and consider a higher or divided dose or an alternative antibiotic for serious infections. Reassess dosing when the barbiturate is stopped.
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 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 Pentobarbital?
MediHelp rates the interaction as moderate. Doxycycline and Pentobarbital 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. Barbiturates induce hepatic enzymes and can shorten the half-life of doxycycline, lowering its concentrations. This may lead to subtherapeutic antibiotic exposure and treatment failure, particularly with prolonged barbiturate use.
How serious is the interaction between Doxycycline and Pentobarbital?
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 clinical response to doxycycline and consider a higher or divided dose or an alternative antibiotic for serious infections. Reassess dosing when the barbiturate is stopped.
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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