Drug interactions
Istradefylline + Loratadine
Severity: Minor
Istradefylline and Loratadine: 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
Istradefylline inhibits P-glycoprotein and can increase exposure to P-gp substrates. Loratadine's wide margin of safety makes serious effects unlikely.
What this interaction means in plain words
Istradefylline and Loratadine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Istradefylline belongs to Central Nervous System; Loratadine belongs to Respiratory.
Why it happens
P-gp inhibition by istradefylline increases loratadine absorption.
What to do
No dose change usually required; monitor for increased drowsiness.
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 Istradefylline
Frequently asked questions
Can I take Istradefylline with Loratadine?
MediHelp rates the interaction as minor. Istradefylline and Loratadine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Istradefylline inhibits P-glycoprotein and can increase exposure to P-gp substrates. Loratadine's wide margin of safety makes serious effects unlikely.
How serious is the interaction between Istradefylline and Loratadine?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No dose change usually required; monitor for increased drowsiness.
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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