I've yet to require medications in over 15 years of plant keeping

But most meds are fine on plants.
Good envirnment, good food etc, prove very effective "cures".
Much like taking good care of the plants "cures" algae.

Same type of thing.

I've not heard of any meds that are bad other than high levels of Copper, salt, permangnate etc.

Regards,
Tom Barr