A weekend in the mountains was always a 'tonic' for him.
To her, classical music is a 'tonic'.
an herbal 'tonic'
(..) more pleasure, Miss Scarlett. You'd better stay to supper, too. I'm sure Aunt Pitty'd be agreeable and I'd like a good long visit with you. Oh, you act on me just like a tonic, Miss Scarlett. And will you tell me all the news... ...all the news of Miss Suellen? What's the matter, Miss Scarlett? (..)1939 Gone with the Wind