because absolutely nothing else works for me, my gastro has me on daily laxatives, both a stimulant (dulcolax) and an osmotic (milk of mag). since i also have a rectocele and a vaginal prolapse, i develop impactions easily and he does not want me getting backed up because then i start to retain urine. he--and my previous gastro--have both told me to "take what i need to go."
but i am an extreme case here, having struggled with chronic c for fifty years. so my treatment reflects this. when i took the sitz marker i had absolutely no bm's at all and passed no markers. i started retaining urine and ended up in the ER , where they pumped out over a liter and a half of urine. not fun. ER doc told me to abort the test (i was almost to day 5 anyway) and go home and immediately do a clean out.
i also have mitochondrial disease which is a contributing cause to my slow transit.
hopefully you have a compentent, knowledgeable and caring gastro who can help you with all of this and also give you any tests you may need...wishing you all the best,