Detectives are investigating the theft of a rucksack full of medication in Benllech.
A silver Vauxhall Corsa car was broken into between Saturday 2nd June and Monday 4th June. The stolen rucksack contained oral morphine, Pregablin tablets and Rivaroxaban medicine.
Police have warned the mediciation is potenitally very dangerous if taken incorrectly.
Anyone with information about the theft should contact North Wales Police on 101.