Final answer:
Generally, a pharmacist without additional prescribing authority cannot initiate drug therapy, even in emergencies, since their role is primarily to dispense prescribed medications.
Step-by-step explanation:
A pharmacist who does not have additional prescribing authority typically cannot initiate drug therapy, even in an emergency. Their role is to dispense medications that have been prescribed by a licensed provider, such as a physician. However, in some jurisdictions, there may be specific protocols in place that allow pharmacists to provide emergency medications under certain conditions. These are usually very clearly defined and limited circumstances. Therefore, without knowing the specific laws and regulations in a given area, it is generally true that a pharmacist cannot initiate drug therapy without prescribing authority.