Answer
Ritonavir strongly affects drug-metabolising enzymes and transporters, so some medicines may reach dangerous concentrations while others may become less effective.
Sources for this answer
- Kaletra 100mg/25mg film-coated tablets (Great Britain) — Current selected SmPCemc · Summary of Product Characteristics
- Kaletra 80mg/20mg Oral Solution (Great Britain) — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.