What is the primary function of a pharmacy designated as a "collector"?

The primary function of a pharmacy designated as a "collector" is the on-site destruction of controlled substances. Collector pharmacies are specifically authorized to accept and manage the disposal of unused or expired controlled substances in a safe and compliant manner. This role is crucial in preventing drug abuse and ensuring environmental safety through proper disposal processes.

In the context of drug regulation, collector pharmacies help facilitate the safe return and destruction of potentially harmful substances that may otherwise pose a risk to public health and safety. Their activities implement proper protocols that align with the Drug Enforcement Administration (DEA) regulations and state laws concerning controlled substances.

Administering controlled substances pertains to medication management and treatment rather than disposal processes, while pharmaceutical counseling focuses on educating patients about their medications. Refilling prescriptions for controlled substances involves the distribution aspect, which is distinct from the role of disposal. Therefore, the unique function of a collector pharmacy emphasizes the importance of responsible handling and destruction of controlled substances, making option B the correct answer.