A pen is mightier than a medicine

I always knew about pet therapy but writing as a therapy is a news to me. Yes, a recent research has confirmed the healing power of writing.......and it is named as poetic medicine.
The study has promising findings in people battling ailments like cancer and other diseases.

http://www.sgvtribune.com/living/ci_12204681

So can I say.......A pen is mightier than a medicine