Since coccidiosis is caused by a protozoan, not a bacteria or virus, I doubt Oxine would have an effect. The oocysts can be killed by ammonia as opposed to bleach, but in a pen situation, liming the heck out of it to change the pH and hopefully, make the environment inhospitable to the suckers would do better than using Oxine.
Corid is concentrated amprolium, not a sulfa drug, and it gets more types of oocysts than the Sulmet, BUT, there are new mutated strains, not one of the 9 named types, popping up all over that are resistant. The poultry lab said a double dosage of Corid should do better than the usual dosage for these types.