So now you put medicien in a battle, that means people can freely cure themselves.
How about making it a permanent thing?
Like when you deal damage, you suffer damages yourself.
The rate of the damage you suffer could depend on the pool, until there is medicine, the rate would be lower, without it it's higher.
This would promote medicine consumption on an individual level, because you don't really need the medicine right now. (If you figth with pool there is no damagae, so i's like 1-2 T3 med per day)