What Should Happen If Narcotics Are Not Used Due to a Partial

What should happen if narcotics are not used due to a partial dosage,error,or cancellation of an order?

A) They should be reviewed by the physician who wrote the order,who will determine next steps.
B) They should be sent back to the pharmacy for inspection and potential reuse.
C) They must be destroyed and two health care practitioners must sign as witnesses of the disposal of the drug.
D) They should be kept in the medication room for other patients for up to one week.