Investigators said they have discovered thousands of Walgreens stores nationwide have been overcharging consumers.
A lawsuit filed by Missouri's Attorney General alleges "Walgreens has consistently and systematically displayed inaccurate sales tags, overcharged consumers and used misleading or confusing in-store signs."
Muscle Milk advertised for $6.99, but rang up at the register $8.99, according to the lawsuit. Lipton Tea marked $1.99 actually cost double that.
Investigators said one in five items in their baskets rang up higher than advertised, ranging anywhere from a few cents to as much as 15 dollars more.
"This level of consumer deception is inexcusable from a corporation as sophisticated as Walgreens," said Missouri Attorney General Chris Koster.
Walgreen Co. declined to comment on the suit, but said they are disappointed and disagree with the attorney general's comments. They are prepared to address any appropriate concerns.
This is not the first time Walgreen Co. faced charges of inaccurate pricing.
Earlier this year, the retailer settled suits with California and Wisconsin without admitting wrongdoing.
Walgreens has more than 8,000 pharmacies in 50 states and Puerto Rico.