下藥

to prescribe medicine / to poison / to slip a drug (into sb's drink etc)

down / downwards / below / lower / later / next (week etc) / second (of two parts) / to decline / to go down / to arrive at (a decision, conclusion etc) / measure word to show the frequency of an action

medicine / drug / substance used for a specific purpose (e.g. poisoning, explosion, fermenting) / CL:種|种[zhong3],服[fu4],味[wei4] / to poison

lit. to prescribe the right medicine for an illness (idiom); fig. to study a problem to find the right way to solve it / to take appropriate steps