my mom is being treated for urinary tract infection with septra ds.she has been taking septra for 5 days now.as well she is suppose to go in for colonscopy on april 6 for rectal prolapse .the medication she was taking before septra was macrobid.when she was on the macrobid it was not helping.she is now getting greylike clay color feces .i am just very concerned about all that is happening please i need some advice.