Drug interactions
Caffeine + Primidone
Severity: Minor
Caffeine and Primidone: 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 may reduce primidone's sedative effect, and high intake may lower seizure threshold. Primidone, through its phenobarbital metabolite, may also increase caffeine clearance.
What this interaction means in plain words
Caffeine and Primidone 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; Primidone belongs to Central Nervous System.
Why it happens
Adenosine antagonism opposes sedation, and CYP1A2 induction by the phenobarbital metabolite increases caffeine metabolism.
What to do
Advise moderate and steady caffeine intake and monitor seizure control in patients with epilepsy.
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 Primidone
- Lorlatinib + Primidone Contraindicated
- Lurasidone + Primidone Contraindicated
- Primidone + Ranolazine Contraindicated
- Primidone + Sofosbuvir-velpatasvir-voxilaprevir Contraindicated
- Primidone + Voriconazole Contraindicated
- Abiraterone + Primidone Major
Frequently asked questions
Can I take Caffeine with Primidone?
MediHelp rates the interaction as minor. Caffeine and Primidone 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 may reduce primidone's sedative effect, and high intake may lower seizure threshold. Primidone, through its phenobarbital metabolite, may also increase caffeine clearance.
How serious is the interaction between Caffeine and Primidone?
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 moderate and steady caffeine intake and monitor seizure control in patients with epilepsy.
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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