Electronic prescribing (e-prescribing) allows doctors to electronically send new prescriptions and prescription renewals to pharmacies instead of using handwritten or faxed notes. The key components of an e-prescribing system include the prescriber, transaction hub, pharmacy, and pharmacy benefit manager. E-prescribing can reduce errors, improve efficiency, and allow doctors and pharmacists to access patients' medication history and insurance information. While e-prescribing provides benefits, it also faces disadvantages such as upfront costs, need for training, potential for errors, and system failures impacting patient care.