H
Hour
Example
The meds say q3h so you should take them every 3 hours
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h definition by Slang.net - The Slang Dictionary
This page explains what the abbreviation "h" means. The various definitions, examples, and related terms listed above have been manually compiled and written by the Slang.net team.
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H is a quick and easy way to denote "hour." In medical contexts, doctors and pharmacists often use "h" to communicate how often you should take your medication. You'll likely see it paired with a "Q" and a number, like "Q4h," meaning every 4 hours. This shorthand helps you stay on track with your dosing schedule without confusion.
Beyond medicine, h pops up just about anywhere someone needs to reference time without spelling it all out. From scheduling meetings to estimating arrival times, h is a helpful abbreviation for saving time when talking about time.