Answer
For Rifadin for Infusion 600 mg (rifampicin), the unopened lyophilisate vial has a shelf life of 36 months and the unopened solvent ampoule has a shelf life of 60 months.
Sources for this answer
- Rifadin For Infusion 600mgSANOFI · emc · SmPC §6.3 Shelf life · Version 32Document updated
Sources checked