Hi Kidsammyc, You sound like you are in a very similar situation to when I applied. I'm not familiar with mazlivant, I assume it is a brand of mesalazine? If so, I take the same drugs but a higher dosage of Imuran (azathioprine). It didn't cause a problem for me on the medical, but I can't stress strongly enough how important it is to be prepared. Discuss your plans with your gastro consultant and ask him to prepare a letter describing your condition, medication and current situation. Get the letter addressed to "whom it may concern" but sent to yourself so you can take it with you. The drugs you take aren't particularly expensive so the Australian authorities won't be worried about that and if the letter from your consultant says that you are stable then that's a pass. If you turn up at your medical without the letter they will write to your consultant and ask for the details and that could delay things by months and put doubt in their mind. It's much better to get passed on the day with no queries.
If there's anything else I can help with just let me know.