Drug interactions
Loratadine + Pentobarbital
Severity: Minor
Loratadine and Pentobarbital: 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
Pentobarbital induces CYP3A4 and may lower loratadine and desloratadine levels, potentially reducing antihistamine effect. Pentobarbital also causes sedation, which may add to any drowsiness from loratadine.
What this interaction means in plain words
Loratadine and Pentobarbital have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Barbiturate induction of hepatic CYP3A4 increases loratadine clearance, plus additive CNS depression.
What to do
Monitor for reduced allergy symptom control and excess sedation; consider an alternative antihistamine if efficacy is lost.
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 Loratadine
- Acrivastine + Loratadine Moderate
- Amobarbital + Loratadine Moderate
- Fentanyl + Loratadine Moderate
- Isocarboxazid + Loratadine Moderate
- Levoketoconazole + Loratadine Moderate
- Loratadine + Mavacamten Moderate
Frequently asked questions
Can I take Loratadine with Pentobarbital?
MediHelp rates the interaction as minor. Loratadine and Pentobarbital have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Pentobarbital induces CYP3A4 and may lower loratadine and desloratadine levels, potentially reducing antihistamine effect. Pentobarbital also causes sedation, which may add to any drowsiness from loratadine.
How serious is the interaction between Loratadine and Pentobarbital?
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 for reduced allergy symptom control and excess sedation; consider an alternative antihistamine if efficacy is lost.
What other medicines interact with Loratadine?
MediHelp also lists interactions of Loratadine with, for example, Acrivastine, Amobarbital, Fentanyl. The full list is on the Loratadine page.
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