Paediatricsmiddle twist
A 9-year-old boy has primary nocturnal enuresis with no daytime urinary symptoms, normal growth, normal blood pressure and a normal urinalysis. An eight-week alarm trial has failed despite good family adherence. He is going on a three-night school camp in a fortnight, and the paediatrician has prescribed sublingual desmopressin 120 micrograms at bedtime to cover it. His mother asks how she should give it. Which one of the following is the most important instruction?