Constipation Management in Elderly Patients

Initial Assessment and Prevention Measures

Ensure access to toilets, especially for those with decreased mobility, to prevent constipation 1, 3
Provide dietetic support to address nutritional needs and manage decreased food intake related to aging 3, 4
Optimize toileting habits by educating patients to attempt defecation twice daily, preferably 30 minutes after meals, and to strain no longer than 5 minutes 3, 4

Polyethylene glycol (PEG) 17 g/day is recommended as the first-line laxative for constipation in elderly patients due to its efficacy, good safety profile, and tolerability 1, 2, 3, 4
Stimulant laxatives (senna, bisacodyl) can be used as second-line options when PEG is insufficient, but be aware of potential abdominal pain and cramps 2, 3
For fecal impaction, rectal measures (suppositories and enemas) are preferred first-line therapy, with isotonic saline enemas being preferable in older adults due to fewer adverse effects 1, 3, 4

Saline laxatives (e.g., magnesium hydroxide) should be used with caution due to the risk of hypermagnesaemia, especially in renal impairment, and require regular monitoring if used with diuretics or cardiac glycosides 1, 3, 4
Bulk-forming agents (psyllium, methylcellulose) should be avoided in non-ambulatory patients with low fluid intake and in patients with opioid-induced constipation 2, 3, 4
Liquid paraffin should be avoided in bed-bound patients and those with swallowing disorders due to the risk of aspiration lipoid pneumonia 3, 4

For opioid-induced constipation, osmotic or stimulant laxatives are generally preferred, and all patients receiving opioid analgesics should be prescribed a concomitant laxative unless contraindicated 2, 6
For patients with renal impairment, monitor closely when using magnesium-based laxatives due to the risk of hypermagnesaemia 1, 3
For patients with cardiac conditions, regular monitoring of chronic kidney/heart failure is necessary when using laxatives with concomitant treatment with diuretics or cardiac glycosides 3, 4

Individualize laxative regimens based on the older person's medical history, particularly cardiac and renal comorbidities, potential drug interactions, and adverse effects 3, 4
Monitor for dehydration and electrolyte imbalances, especially in patients with chronic kidney/heart failure 3, 4
Assess response to treatment and adjust as needed 3