Police are warning parents in the Burnham-on-Sea area to be vigilant after morphine tablets were reported missing.
Officers believe the pink-coloured 20mg tablets could have fallen out of, or been taken from, a woman's handbag after she went to a club on the Sandy Glade Holiday Park in Coast Road.
They are worried about the possibility of children finding the medication, and are urging parents to advise youngsters to inform them immediately if they see them.
The tablets were contained in a foil pop-out packet.
Anyone who finds the tablets should call police at Burnham-on-Sea on 101.