Answer
Reconstituted Betaferon (interferon beta-1b) must be discarded before use if it contains particulate matter or is discoloured; its normal appearance is colourless to light yellow and slightly opalescent to opalescent.
Sources for this answer
- BetaferonBayer plc · emc · SmPC §6.6 Special precautions for disposal and other handling · Version 28Document updated
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