Veterinary Technician Complete Exam Practice 2026

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If treatment instructions read "Administer chloramphenicol 500 mg B.I.D per OS," how should this be interpreted?

500 mg once a day by mouth

500 mg twice a day by mouth

The instruction "Administer chloramphenicol 500 mg B.I.D per OS" should be interpreted as administering 500 mg of the medication twice a day by mouth.

"B.I.D" is the abbreviation for "bis in die," which means "twice a day" in Latin. This indicates the frequency of administration. The term "per OS" denotes that the drug should be given orally, meaning by mouth. Therefore, combining these elements confirms that the correct interpretation is to administer 500 mg of chloramphenicol two times a day orally.

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250 mg once a day by mouth

250 mg twice a day by mouth

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