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What is OD BD and HS?

Published in Medical Abbreviations 1 min read

OD, BD, and HS are abbreviations commonly used in medical prescriptions to indicate the frequency and timing of medication administration.

  • OD: Stands for "once a day". It typically refers to taking the medication once in the morning.
  • BD: Stands for "twice a day" or "bis in die" (Latin for "twice a day"). It indicates that the medication should be taken twice a day, usually at equal intervals, such as morning and evening.
  • HS: Stands for "at bedtime". It indicates that the medication should be taken before going to sleep.

These abbreviations help ensure patients understand their medication schedule correctly and adhere to their prescribed dosage. However, it is crucial to clarify any doubts with your doctor or pharmacist to avoid potential medication errors.