True or False: Written prescriptions must be signed by the physician.

Written prescriptions must be signed by the physician to be considered valid. The signature serves as a confirmation of the physician's approval and authorization for the medication to be dispensed to the patient. This requirement not only ensures accountability but also minimizes the potential for misuse or errors in medication distribution. In the absence of a signature, the prescription could be questioned by pharmacists or regulatory authorities, ultimately affecting patient care. Therefore, it is essential for medical assistants and other healthcare professionals to understand the importance of having signed prescriptions for legal and ethical compliance in medical practice.