Hi moose,
I have been on aza since 2003 with a 2 year break from 2008 to 2010. Azathioprin, as your GI surely told you, is an immunosuppresive drug, that is it's primary purpose is to help you manage your Crohn's im one simple way, it keeps your white blood cell count in the lower normal range, so if there is a trigger event (bad food, stress, etc.) your immune system has a hard time to overreact and create inflammation in the intestine. Having said that, aza cannot help you to actually get to remission, but it can help you once you are in remission to stay there.
More facts about aza:
1. It takes about 3-4 months to really be effective and suppress your immune system in a way that can help you long term.
2. It is not effective outside a range of 2 to 2.5mg per kg bodyweight or around 0.9 to 1.1mg per lbs. 50mg is a very low dose, but many GIs want to start low and then increase.
3. Aza can affect the liver, which is one reason why you need to do regular blood checks. Some GIs are content to do those checks every 8 weeks, some say you should do them every 4-6 weeks to be on the safe side.
4. Aza lowers the white blood cell count. It should stay in a rangenof about 3,500-5,000 (often blood results just say 4.0-10.0 as the normal range, it means 4,000-10,000 WBC - white blood cell count per mcL). The blood tests also check if the dosage isn't too strong or too weak.
5. Aza can lead to more severe infections, especially if there are other problems, like weight loss or a flare coinciding with getting sick. On the other hand, I have experienced fewer colds and generally a more stable health when it comes to infections.
6. Aza should be taken about the same time per day and under the same circumstance, at best at least split between morning and evening. That is because you want to keep a constant blood level of it instead of ups and downs.
7. Lastly, like any drug, aza doesn't help by itself. If you take it and you still keep on having problems, you can't say after 6 months (and no side effects) "damn, why ain't I good? It's not working". Aza helps, but it doesn't cure. Managing your Crohn's with an effective diet (knowing what to eat, how to eat and what not to eat), sport, stress relief, supplements if necessary etc. always comes first, drugs come second and only help you along.
All the best,
A