A drug may not be given equally to all patients.

"Vancomycin for your mother, metronidazole for your mother-in-lw" (Read, 2007)


Prescription bias can occur when a drug is prescribed:

(1) only for a certain disease severity

(2) only to a subset of patients based on sex, education or insurance

(3) only to a subset of patients who may be able to use or not use a drug or device (such as an inhaler) correctly


Prescription bias may also extend to the dose and route of administration.

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