A registered pharmacy technician cannot engage in which of the following?

A registered pharmacy technician is not permitted to engage in patient counseling because this activity falls under the scope of practice reserved for licensed pharmacists. Patient counseling involves providing information and advice to patients about their medications, which requires a comprehensive understanding of pharmacology, interactions, and therapeutic outcomes that only a pharmacist is qualified to provide.

In contrast, tasks like filling prescriptions, inventory management, and assisting pharmacists are clearly defined responsibilities of pharmacy technicians. Filling prescriptions involves preparing and dispensing medications under the supervision of a pharmacist, while inventory management includes maintaining stock levels and ensuring medications are properly stored. Assisting pharmacists in various tasks is also within the technician's role, allowing pharmacists to focus on clinical responsibilities.