Definition: Around-the-clock (ATC) medication is defined as medication that is given at regularly scheduled intervals throughout the day. In contrast to medication that is given only as needed (indicated sometimes with the medical code "prn"), ATC medication is ordered by a physician to be given at specific intervals for maximum symptom control. Around-the-clock dosing is common for opioid medication to manage pain.
Around-the-Clock (ATC) Medication
From Angela Morrow, RN, former About.com Guide
Updated December 08, 2009
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
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