No drugs shall be administered except upon the order of a person lawfully authorized to prescribe for and treat human illness. All such orders shall be in writing and signed by the person giving the order. The name, quantity or duration of therapy, dosage and time of administration of the drug, the route of administration if other than oral and the site of injection when indicated shall be specified. Telephone orders may be given only to a licensed pharmacist or licensed nurse and shall be immediately recorded in the patient's health record and shall be signed by the prescriber within 48 hours. The signing of orders shall be by signature or a personal computer key.