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q.h.

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  1. (in prescriptions) each hour; every hour.

Origin of q.h.

From the Latin word quāque hōrā
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
q.h. in Medicine

q.h.

abbr.
  1. quaque hora (every hour)
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.