I know we have very different belief systems, and I'm not going to pretend to know yours. I mean nodisrespect by that, just being honest.
What I do know though, is that I avoid Rx meds like the plague. I prefer the more natural route of holistic healing. Almost anything can be looked at as a medicine, especially if you read the actual definition.
Medicine defined
Drug defined
According to the basic definitions, even food can be looked at like a medicine/drug. Food very much has a "physiological effect when ingested or otherwise introduced into the body."
It's naturally found in food also! Would you consider tomatoes, walnuts, olives, rice, barley, strawberries, cherries, and cow’s milk medicine?
In regards to season changes, it has a big effect on your own melanin production.
https://www.sleep.org/articles/melatonin/
It doesn't get more natural that a compound that your body naturally produces. If it's something you feel strongly on, and are not willing to try, I understand. I'm just trying to shine a bit of light on the subject. I'm not trying to challenge your beliefs, and respect your conviction. I am however trying to (nicely) challenge your understanding of it as a medicine.