Good question! And one for which there probably isn't an answer. You can find intereactions for one on one use of medications, but rarely (i.e. never) for multiple situations.
I thought this was interesting re the pred/omeprazole question
since they suggest that only GCA-level doses or in combination with NSAIDs require its use. And although low dose aspirin has been used in the past as standard, it is now to be discouraged because the benefits do not outweigh the risks. This paper does also mention the combination of pred/PPI increasing risk of fractures in a synergistic manner.
points out that absorption of aza is affected by stomach pH - i.e. the use of omeprazole but I don't know if that would be avoided by taking the aza at a different time, i.e. 1 hour+ before the PPI. However - the immunosuppressive effect of the aza is likely to be affected by the PPI.
PPI should be taken in the morning either before or with breakfast - so I would take it before, then others after. Other than that PMRpro has answered - if still in doubt check with pharmacist.
It has been floating around for quite a while. The Telegraph mentioned it a week ago and I think I read it in the BMJ (British Medical Journal) recently. It was on the World Service last night.
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