Sales fell the most in the Northeast, which saw a decrease of 13.7 percent, while the decline in the South and Midwest was around eight percent. The West saw growth of 7.9 percent.
Michal Dworczyk said that although 69% of Poles have declared they want to be vaccinated against the coronavirus, the biggest challenge was making sure they do it.
"We are carrying out another advertising campaign ... we have sports people involved, we have actors involved, influencers involved," Dworczyk told a news conference.
Moderna Inc, whose vaccine is authorized for adults 18 and older, said it will submit the findings of its adolescent study to the US Food and Drug Administration and other regulators for emergency use authorization in early June.
US regulators took about a month to review a similar study from Pfizer/BioNtech, which was authorized for ages 12-15 on May 10. If Moderna gets the same treatment, its authorization would come in early July.
The country's industrial production for April marked the 15th consecutive month of year-on-year growth, even as it battles a sharp rise in coronavirus infections.