Answer
Pegasys (peginterferon alfa-2a) pre-filled syringes have a shelf life of 3 years for the 90 microgram strength and 4 years for both the 135 and 180 microgram strengths.
Sources for this answer
- Pegasys 90 micrograms, 135 micrograms and 180 micrograms solution for injection in pre-filled syringepharmaand GmbH · emc · SmPC §6.3 Shelf life · Version 2Document updated
Sources checked