Drug interactions
Atenolol-chlorthalidone + Primidone
Severity: Minor
Atenolol-chlorthalidone 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
Primidone, and its metabolite phenobarbital, induces hepatic enzymes and can lower concentrations of drugs that are metabolized. Atenolol is mostly cleared renally, so the effect is expected to be small, though some reduction in beta-blockade is possible.
What this interaction means in plain words
Atenolol-chlorthalidone 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.
Atenolol-chlorthalidone belongs to Cardiovascular; Primidone belongs to Central Nervous System.
Why it happens
Enzyme induction by primidone/phenobarbital; atenolol is minimally metabolized so impact is limited.
What to do
Monitor heart rate and blood pressure after starting or stopping primidone and adjust the atenolol dose only if response is inadequate.
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 Atenolol-chlorthalidone
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 Atenolol-chlorthalidone with Primidone?
MediHelp rates the interaction as minor. Atenolol-chlorthalidone 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. Primidone, and its metabolite phenobarbital, induces hepatic enzymes and can lower concentrations of drugs that are metabolized. Atenolol is mostly cleared renally, so the effect is expected to be small, though some reduction in beta-blockade is possible.
How serious is the interaction between Atenolol-chlorthalidone 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: Monitor heart rate and blood pressure after starting or stopping primidone and adjust the atenolol dose only if response is inadequate.
What other medicines interact with Atenolol-chlorthalidone?
MediHelp also lists interactions of Atenolol-chlorthalidone with, for example, Acebutolol, Aldesleukin, Amiodarone. The full list is on the Atenolol-chlorthalidone page.
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