Final answer:
Physicians cannot call in refills for Robitussin AC, as it contains codeine, a controlled substance. Each refill must follow DEA regulations, potentially necessitating a new prescription.
Step-by-step explanation:
The question is whether a physician can call in a number of refills for Robitussin AC. The answer is b) No. Robitussin AC contains codeine, which is classified as a controlled substance due to its potential for abuse and dependence. The U.S. Drug Enforcement Administration (DEA) regulates the prescribing and refilling of controlled substances, and electronic prescriptions for controlled substances have specific requirements, including a secure process for refills. Physicians cannot simply call in refills for controlled substances; each refill must be authorized in a manner compliant with federal regulations. In some cases, a new prescription may be necessary for each refill.