A client taking propylthiouracil for hyperthyroidism reports a fever and sore throat. Which action should the nurse take?

Fever and sore throat during propylthiouracil therapy can signal agranulocytosis. The medication is withheld while the prescriber is contacted and white blood cell evaluation is arranged because infection can become rapidly dangerous.

Quick answer
Hold propylthiouracil and urgently evaluate fever and sore throat for agranulocytosis.

Why this is correct
Propylthiouracil can rarely cause severe neutrophil depletion. Fever or throat pain may be the first infection signal, so continuing the medication or masking symptoms could delay recognition of a potentially life-threatening adverse reaction.

Easy analogy or mental picture
White blood cells are like an infection-response crew; agranulocytosis can leave too few responders available. The analogy explains the danger but does not diagnose the condition without laboratory assessment.

Memory hook
PTU plus fever or sore throat means hold, call, and count cells.

NCLEX decision rule
For a medication linked to severe blood dyscrasia, treat new infection symptoms as a safety signal. Withhold further exposure as directed, notify the prescriber, and obtain the indicated blood count rather than offering symptomatic reassurance.

Why the other choices are wrong
Food does not remove agranulocytosis risk. A cold product can mask progression, and infection symptoms are not an expected sign of successful thyroid treatment.