It was around 4:30 a.m. when the suspect entered the Walgreen's Pharmacy located at the corner of York Road and County Line Road in Warminster Township.
He approached the pharmacy counter and demanded drugs, pulling up his jacket to display a handgun in his waistband.
The man was given several bottles of undisclosed drugs before he fled the store on foot towards County Line Road.
No one was injured during the robbery.
The suspect is described as a white male in his 30's, brown hair and a scruffy beard, and wearing a red Phillies baseball hat, dark grey hooded sweatshirt and jeans.
Anyone who recognized the suspect or knows his identity is asked to call the Warminster Police at (215) 672-1000. Callers may remain anonymous.