Police were called to the Co-operative Pharmacy in Delph on Monday afternoon, after reports of an armed robbery.
The incident happened at about 3:35pm, and when officers got there they that found prescription drugs had been stolen.
When contacted by Saddleworth News, police said that inquiries were ongoing.
A reminder that if you want to ring the Saddleworth and Lees police team directly about any matter, you can call the Uppermill office on 0161 856 4524. The best number to use for out-of-hours calls is 0161 872 5050, but in an emergency, always dial 999.