Autovermietung Hofmann GmbH

I got prescribed miralax for a 2 day bowel clean out. As directed by my urologist I drank 32 ounces at 10am with 5 capfuls of miralax again just now (2pm). I have not had the urge to go to the bathroom or anything.. how long will it take it to work? Is it not working on me?...