Drug interactions
Loratadine + Rifapentine
Severity: Minor
Loratadine and Rifapentine: 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
Rifapentine induces CYP3A4 and may lower loratadine and desloratadine levels, possibly reducing antihistamine effect.
What this interaction means in plain words
Loratadine and Rifapentine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Loratadine belongs to Respiratory; Rifapentine belongs to Anti Bacterial.
Why it happens
Induction of CYP3A4 by rifapentine increases loratadine clearance.
What to do
Monitor allergy symptom control; use a different antihistamine or adjust the dose 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
Other interactions of Rifapentine
- Ledipasvir-sofosbuvir + Rifapentine Contraindicated
- Lorlatinib + Rifapentine Contraindicated
- Lurasidone + Rifapentine Contraindicated
- Ranolazine + Rifapentine Contraindicated
- Rifapentine + Sofosbuvir-velpatasvir Contraindicated
- Rifapentine + Sofosbuvir-velpatasvir-voxilaprevir Contraindicated
Frequently asked questions
Can I take Loratadine with Rifapentine?
MediHelp rates the interaction as minor. Loratadine and Rifapentine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Rifapentine induces CYP3A4 and may lower loratadine and desloratadine levels, possibly reducing antihistamine effect.
How serious is the interaction between Loratadine and Rifapentine?
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 allergy symptom control; use a different antihistamine or adjust the dose 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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