Three men are on the run after an armed robbery at a Hampton Park chemist on 20 June.
Casey Crime Investigation Unit said the masked men, one armed with a crowbar, entered the Pound Road pharmacy about 9.30pm.
They pushed over a security guard and made demands for cash from the attendant before taking an amount of money and fleeing, police say.
Investigators believe the trio may have fled the scene in a dark vehicle.
No one was injured during the incident.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au