Immunomodulators
This class of medications work off the theory that Crohn’s is an autoimmune disease. It is thought that by reducing the strength of the immune system itself, the processes that cause the disease will also be weakened, resulting in reduced symptom occurrence.
Immunomodulators include 6MP and azathioprine, and while they may have some effect on alleviating the signs of Crohn’s disease, they also leave the body open to attack from sources that are unrelated to the disease.
Drugs like these are not miracle cures, and they may even take several weeks or months to become effective. Altering a function within the body like the immune system is a major undertaking, and one which shouldn’t happen overnight if you wish to do so in at least a relatively safe manner.