A nurse in a substance abuse clinic is assessing a client who recently started taking disulfiram. The client reports having discontinued the medication after experiencing severe nausea and vomiting. Which of the following reasons should the nurse suspect to be a likely cause of the client’s distress?

Choice A reason: Common side effects of disulfiram include mild nausea, headache, or fatigue, resulting from its inhibition of aldehyde dehydrogenase. However, severe nausea and vomiting are not typical unless triggered by alcohol consumption, which causes a disulfiram-alcohol reaction, making this an unlikely primary cause of the client’s distress. Choice B reason: Disulfiram inhibits aldehyde dehydrogenase, causing acetaldehyde buildup when alcohol is consumed, leading to severe nausea, vomiting, and flushing. This disulfiram-alcohol reaction is the most likely cause of the client’s symptoms, as it is designed to deter alcohol use in substance abuse treatment, matching the described distress. Choice C reason: An overdose of disulfiram is rare and typically causes symptoms like drowsiness or confusion, not severe nausea and vomiting. The client’s symptoms align more closely with the disulfiram-alcohol reaction, which is a pharmacological effect, not an overdose, making this an unlikely cause. Choice D reason: An allergic response to disulfiram might cause rash, itching, or anaphylaxis, but severe nausea and vomiting are not typical allergic symptoms. These symptoms are more consistent with the disulfiram-alcohol reaction, where acetaldehyde accumulation triggers intense gastrointestinal distress, ruling out allergy as the likely cause.