primum non nocere

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Latin for ‘first do no harm.’ A guiding principle for physicians that, whatever the intervention or procedure, the patient’s well-being is the primary consideration
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

primum non nocere

First, do no harm Medical ethics A guiding principle for physicians, that whatever the intervention or procedure, the Pt's well-being is the primary consideration. See Hippocratic oath.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

primum non nocere

A dictum, universally-respected among doctors, to the effect that one's first concern should be to do no harm to the patient.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005