Management of Constipation in Elderly Patients

First-Line Pharmacological Management

The American College of Gastroenterology recommends starting polyethylene glycol (PEG) 17 g daily as the preferred first-line laxative for elderly patients due to its excellent safety profile and efficacy 1, 2
If no bowel movement occurs within 3-4 days, escalate PEG to 17 g twice daily (34 g total/day) 2
If PEG escalation proves insufficient after 3-4 days, add bisacodyl 10-15 mg daily as a stimulant laxative 1, 2

Ensure easy toilet access, particularly critical if the patient has decreased mobility 1, 3
Educate the patient to attempt defecation twice daily, 30 minutes after meals, straining no more than 5 minutes 1, 3
Increase fluid intake to at least 1.5 liters daily within patient limits 1
Encourage physical activity and increased mobility as tolerated 1

Quetiapine can cause constipation in older adults through broad muscarinic receptor blockade, according to the Mayo Clinic guidelines 4
The Mayo Clinic guidelines recommend tapering quetiapine when possible in elderly patients, particularly when used for behavioral control in cognitive disease, as it is safe to taper to off, especially when there is perceived lack of benefit 4

Avoid magnesium-containing laxatives (magnesium hydroxide, magnesium citrate) due to hypermagnesemia risk, particularly if any degree of renal impairment exists 1, 2
Avoid bulk-forming laxatives (psyllium, methylcellulose) if the patient has low fluid intake or limited mobility due to obstruction risk 1, 2, 3
Avoid liquid paraffin if the patient is bed-bound or has swallowing difficulties due to aspiration lipoid pneumonia risk 1, 3
Avoid sodium phosphate enemas; use isotonic saline enemas (500-1000 mL) instead if rectal measures become necessary 1, 3
Do not use docusate alone as it is ineffective compared to PEG or stimulant laxatives 1
Do not use magnesium-based laxatives without confirming normal renal function, as elderly patients are at high risk for hypermagnesemia 1, 2