[Answered]: An 82-year-old woman presents to the clinic with…

An 82-year-old woman presents to the clinic with reports of constipation for the past year. She reports the passage of hard stool every 3–4 days. She reports no abdominal pain, nausea, vomiting, diarrhea, or blood in her stool. She takes no opioid pain medications and is fairly active. She reports that she has been taking daily over-the-counter psyllium with no improvement. She has a 10-year history of hypertension and stage 4 chronic kidney disease. Her physical examination is unremarkable. What is the most appropriate next step in the treatment of this patient’s constipation?