Dennis Czerw, owner of Parkway Pharmacy in Philadelphia, served 175 new customers in January. He was “astounded,” he said, given that vaccine demand dropped off later in the month. In February 2021, before the COVID-19 vaccine was available to most people, Parkway had 40 new customers. Vaccinations have brought many new people through the door in recent years and several nearby chain pharmacies have closed, but that doesn’t mean Czerw’s business is booming. “My prescription numbers aren’t growing as much as I’d like them to” for several reasons, he said. In some instances, Czerw has to turn aw…