Final answer:
After an emergency telephone C2 prescription, the prescriber must mail a valid written prescription to the pharmacy, which must be post-marked within seven days.
Step-by-step explanation:
If the prescriber chooses to mail the pharmacy the valid prescription following an emergency telephone C2 rx, it must be post-marked within seven days.
An emergency telephone C2 prescription is a situation where a Schedule II controlled substance is prescribed in an emergency situation via telephone. The Controlled Substances Act and the Drug Enforcement Administration (DEA) regulations require that a written and signed prescription must be provided to the pharmacy within a certain time frame after the emergency prescription was issued. Failure to comply with the regulations can result in penalties for the prescriber and the pharmacy.