Answer
Antacids reduce the bioavailability of rifampicin, isoniazid and ethambutol in Rimstar, so Rimstar should be taken at least 1 hour before antacids.
Sources for this answer
- Rimstar Film-coated Tablet / Voractiv Film-coated TabletSandoz Limited · emc · SmPC §4.5 Interaction with other medicinal products · Version 11Document updated
Sources checked