The abbreviation for four times a day is "q.i.d." This stands for "quater in die," which is Latin for four times a day. It is commonly used in medical prescriptions to indicate the frequency of medication administration.
References:
Medical Abbreviations: 32,000 Conveniences at the Expense of Communication and Safety by Neil M. Davis
Institute for Safe Medication Practices (ISMP) - Abbreviation Guidelines
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