SOPs need to remain current to be useful. It is the responsibility of the superintendent and supervising pharmacist to ensure they are updated and reviewed regularly, at a minimum annually or when any element of the process changes, for example if legislation or PSI Guidance has been updated or as a result of an error or incident.
SOPs should be clearly marked with a scheduled date for the next review.
When a review takes place, the review should be documented, i.e. dated and signed by the appropriate person, and the policy or procedure should be updated if necessary.
As part of your review, if an SOP is available for a service that is no longer provided then it should be withdrawn from the current set and archived.