Should I medicate my flock?

[myblackf150]

I have 4- 1 year old hens and 12- 8 week old hens. My question is related to medications. I don't want to give my chickens any unnecessary medications but I also don't want health issues because I did not give them what they need. They all eat grower feed supplemented with oyster shells but I have never medicated them at all. They are all very healthy and happy and there are no concerns on the surface. What are the concerns and recommendations for not medicating? Is medication required?
Thanks for any input you all may have.

 

[canada-goose]

Unless they start seeming sick, I don't give my birds any medications. They don't get medicated in the wild so I'm pretty sure it isn't necessary.

 

[crazy chook]

Unless my chickens show signs, I do not medicate. What is that ol saying 'if it aint broken don't fix it!!