Rearrange the parts to make a meaningful sentence.

P. under the age

Q. given to children

R. on no account must

S. the medicine be

T. of twelve

Explanation

1. 01

   "On no account" at the start turns the verb round: R "on no account must", then S "the medicine be", the subject and a plain verb.

2. 02

   "Be" needs a past form: Q "given to children", and P says which children, completed by T.

3. 03

   So the order is RSQPT: "On no account must the medicine be given to children under the age of twelve."