A practical assessment protocol for clinically relevant P-glycoprotein-mediated drug-drug interactions

Area of Science:

• Pharmacology
• Clinical Pharmacy
• Drug Interactions

Background:

• Drug-drug interactions (DDIs) significantly impact medication effectiveness and safety.
• P-glycoprotein (P-gp) mediated DDIs are common but often lack sufficient clinical guidance.
• Existing information is insufficient for managing P-gp DDIs in practice.

Purpose of the Study:

• To describe a protocol for assessing P-gp mediated DDIs.
• To develop and implement practice recommendations for clinically relevant P-gp DDIs.
• To address changes in systemic drug exposure caused by P-gp interactions.

Main Methods:

• A seven-step approach combining literature review and expert opinion.
• Establishment of an expert panel and core definitions.
• Selection of P-gp modulators and substrates for evaluation.

Main Results:

• Classification of P-gp modulators and substrates for clinical relevance.
• Development of practice recommendations for clinically relevant P-gp DDIs.
• Extrapolation of conclusions for DDIs with limited data based on pharmacological properties.

Conclusions:

• A standardized protocol for assessing P-gp mediated DDIs has been developed.
• The approach generates alerts and recommendations for managing P-gp DDIs.
• Recommendations aim to improve patient care and support clinical decision-making.