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s.o.s.

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  1. (in prescriptions) if necessary.

Origin of s.o.s.

From the Latin word sī opus sit
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
s.o.s. in Medicine

s.o.s.

abbr.
  1. si opus sit (if needed)
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.