Answer
Yes. Proton-pump inhibitors, H2-receptor antagonists and frequent antacid use can reduce absorption and potentially reduce effectiveness. Ask the cancer team to review them.
Sources for this answer
- Gefitinib Sandoz 250 mg Film-coated Tablets — 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.