Drug interactions
Caffeine + Doxepin
Severity: Minor
Caffeine and Doxepin: 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
Caffeine can counteract the sedating effect of doxepin, which may reduce its benefit when used for insomnia. Caffeine may also add to tachycardia or anxiety in patients on tricyclic antidepressants.
What this interaction means in plain words
Caffeine and Doxepin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Caffeine belongs to Miscellaneous; Doxepin belongs to Dermatology.
Why it happens
Opposing pharmacodynamic effects on arousal (adenosine antagonism versus histamine H1 blockade).
What to do
Advise avoiding caffeine in the hours before the doxepin dose when it is used for sleep; monitor heart rate if palpitations occur.
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 Caffeine
- Caffeine + Ephedrine Major
- Caffeine + Fezolinetant Major
- Caffeine + Methylenedioxymethamphetamine Major
- Caffeine + Selegiline transdermal Major
- Adenosine + Caffeine Moderate
- Benzphetamine + Caffeine Moderate
Other interactions of Doxepin
- Doxepin + Isocarboxazid Contraindicated
- Doxepin + Phenelzine Contraindicated
- Doxepin + Procarbazine Contraindicated
- Doxepin + Safinamide Contraindicated
- Doxepin + Selegiline Contraindicated
- Doxepin + Tranylcypromine Contraindicated
Frequently asked questions
Can I take Caffeine with Doxepin?
MediHelp rates the interaction as minor. Caffeine and Doxepin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Caffeine can counteract the sedating effect of doxepin, which may reduce its benefit when used for insomnia. Caffeine may also add to tachycardia or anxiety in patients on tricyclic antidepressants.
How serious is the interaction between Caffeine and Doxepin?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Advise avoiding caffeine in the hours before the doxepin dose when it is used for sleep; monitor heart rate if palpitations occur.
What other medicines interact with Caffeine?
MediHelp also lists interactions of Caffeine with, for example, Ephedrine, Fezolinetant, Methylenedioxymethamphetamine. The full list is on the Caffeine page.
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