。
Please keep medicine out of children's reach.
Literal
Medicine [topic-は] child [poss-の] hand [subj-の] not-reach place [loc-に] put-[request-てください].
A polite request rather than a direct command — ~てください softens 置く into 'please place.' The same content can be delivered as a blunt imperative, a moral 'should,' or a tentative request; the choice of ~てください sits squarely in the everyday-polite middle.