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q_h (on prescription): If a medicine is to be taken every so-many hours, it is written q_hthe q standing for the Latin word for once quaque and the h indicatingthe number of hours.So, for example, 2 caps q4h means Take 2 capsules every 4 hours.However it is written, it is one of a number of hallowed abbreviations ofLatin terms that have been traditionally used in prescriptions to specifythe frequency with which medicines should be taken.
Other examples include:
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