Final answer:
The correct answer is a. expiration date. Once a multiple dose vial is opened, it should be discarded based on its expiration date. For example, if a vial of insulin has an expiration date of six months after opening, it should be discarded six months after its first use, even if there is still some insulin remaining in the vial.
Step-by-step explanation:
The correct answer is a. expiration date. Once a multiple dose vial is opened, it should be discarded based on its expiration date. This is because the effectiveness and safety of medications can deteriorate over time, and using expired medications may lead to harmful or ineffective treatment. For example, if a vial of insulin has an expiration date of six months after opening, it should be discarded six months after its first use, even if there is still some insulin remaining in the vial.
Once a multiple dose vial is opened, it should be discarded based on its expiration date. For example, if a vial of insulin has an expiration date of six months after opening, it should be discarded six months after its first use, even if there is still some insulin remaining in the vial.