My 3 year old and chronic constipation?

My son is 3 and has chronic constipation. He goes to the doctor and they put him on medication to clean him out but then he becomes constipated again. We don't know what to do. We put him on the potty after dinner and he sits for 30 min but will not do anything. If anyone has any ideas about what we can try I... show more My son is 3 and has chronic constipation. He goes to the doctor and they put him on medication to clean him out but then he becomes constipated again. We don't know what to do. We put him on the potty after dinner and he sits for 30 min but will not do anything. If anyone has any ideas about what we can try I would really appreciate it.
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