A nurse is teaching a patient who is about to begin drug therapy with orlistat [Xenical]. The patient, whose BMI is 28, has hypertension and type 2 diabetes mellitus. Which statement by the patient indicates understanding of the teaching?

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Because orlistat works by reducing fat absorption, fat-soluble vitamins are not absorbed as well. Patients should take a multivitamin containing vitamins A, D, E, and K. The increased fat is lost in stools, resulting in fatty, oily stools, and fecal incontinence. These are expected side effects but are not dangerous, and can be managed with bulk-forming laxatives. Orlistat is used for long-term weight loss and should be given up to 2 years to sustain weight loss. Dark urine and light-colored stools indicate possible liver damage and the need to discontinue the drug until liver damage has been ruled out.

A Nurse Is Teaching a Patient Who Is About to Begin