that depends (not a pun). laxatives are somewhat unpredictable so individual responses cannot be determined in advance. if he was truly constipated then this gentle stimulant type laxative should work sometime in the next 24 hours but that would depend on the dosage the amount of constipation and of course his individual response. assuming the school has a readily-available toilet for him to use when the fletcher's kicks in he will be fine. i don't know his age but keep in mind that boys often hate to use the bathroom at school due to the lack of cleanliness and privacy. if you don't believe me check it out yourself some day. shy boys tend to urinate in the stalls and will pee on the toilet seats (and floor) so boys refuse to sit on them. many stalls have non-working doors and some elementary school have rules and penalties for using the toilet during class time. some young kids would hold it until they explode rather than miss a recess. so the choice is yours. if you have used this in the past for your son and know what to expect you will need to decide if it is reasonable for him to go to school with a laxative that may still be on-board.
my son took 1 dose of fletchers laxative for kids around 6 this morning. will he be ok to go to school tomorrow?