Thereisn'taspecificabbreviationfor"处方用法用量"inEnglish.However,acommonlyusedabbreviationfor"dosage"is"Dose."Asfor"prescriptionusage,"itcanbeabbreviatedas"Rx."
There isn't a specific abbreviation for "处方用法用量" in English. However, a commonly used abbreviation for "dosage" is "Dose." As for "prescription usage," it can be abbreviated as "Rx."