Drug interactions
Ethanol + Varenicline
Severity: Moderate
Ethanol and Varenicline: 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
Some patients taking varenicline have had heightened intoxication from alcohol, occasionally with aggressive behavior or amnesia. This can impair judgment and safety.
What this interaction means in plain words
Ethanol and Varenicline 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
The mechanism is not established; a pharmacodynamic enhancement of alcohol effects on the CNS is suspected.
What to do
Advise patients to drink less alcohol, or abstain, until they know how varenicline affects their tolerance. Counsel about driving and unusual behavior.
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 Varenicline
- Tafenoquine + Varenicline Moderate
- Trilaciclib + Varenicline Moderate
- Cimetidine + Varenicline Minor
- Erdafitinib + Varenicline Minor
- Ibuprofen / famotidine + Varenicline Minor
- Nicotine inhaled + Varenicline Minor
Frequently asked questions
Can I take Ethanol with Varenicline?
MediHelp rates the interaction as moderate. Ethanol and Varenicline 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. Some patients taking varenicline have had heightened intoxication from alcohol, occasionally with aggressive behavior or amnesia. This can impair judgment and safety.
How serious is the interaction between Ethanol and Varenicline?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Advise patients to drink less alcohol, or abstain, until they know how varenicline affects their tolerance. Counsel about driving and unusual behavior.
What other medicines interact with Varenicline?
MediHelp also lists interactions of Varenicline with, for example, Tafenoquine, Trilaciclib, Cimetidine. The full list is on the Varenicline page.
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