Most medicated starter feeds contain amprolium, a coccidiostat.
They probably need full strength Corrid, but any amount of amprolium will be better than none till you can get some. I hope your flock gets better sooner, seems things haven't been going so well lately. Good luck!
:frow
@Eggcessive
@casportpony
@Texas Kiki
sending out a bat alert, oops, chick alert!
:gig
One of these fine Chickenologists should be with you shortly. They are like walking encyclopedias of chicken medicine. :old