people over 55 years of age, people who suffer from dehydration, kidney disease, acute colitis, or delayed bowel emptying, and, people taking certain medicines that affect kidney function, such as diuretics (fluid pills), angiotensin converting enzyme inhibitors (medications that lower blood pressure), angiotensin receptor blockers (used to treat high blood pressure, heart or
kidney failure), and possibly nonsteroidal anti-inflammatory drugs (similar to
ibuprofen and other arthritis medication