A nurse is caring for a client who is taking desvenlafaxine. Which of the following findings should the nurse document as an adverse effect of this medication?

Choice A reason: Insomnia is a common adverse effect of desvenlafaxine, an SNRI antidepressant. By increasing serotonin and norepinephrine levels, the medication can cause heightened alertness and difficulty sleeping. This is a well-documented side effect and should be monitored. Choice B reason: Weight loss is not a typical adverse effect of desvenlafaxine. While some antidepressants may affect appetite, desvenlafaxine is more likely to cause nausea or decreased appetite rather than significant weight loss. Choice C reason: Diarrhea can occur with some antidepressants, but it is not a primary adverse effect of desvenlafaxine. Gastrointestinal upset is more commonly seen as nausea rather than persistent diarrhea. Choice D reason: Increased salivation is not associated with desvenlafaxine. Antidepressants may cause dry mouth due to anticholinergic effects, but excessive salivation is not expected.