Drugstore Conundrum

Turns out, my sore throat last week was the first stage of a horrendous cold and, because (as Philly has kindly informed me) I have the loudest cough in the history of coughs, I decided to do my coworkers a favor and buy some cough drops. As I was reaching for the Halls Honey-Lemon variety at the drugstore, I noticed that the Walgreens brand had the same flavor and, unlike the pricier Halls version, they were two for 99 cents. Sold!

Here's what I don't get. While the Halls cough drops are branded with the letter "H," which makes perfect sense, the generic ones are branded with the letter "B," which, according to my observations, makes no sense whatsoever. I have searched the package for something that would indicate why these drops would be marked with a B, but I came up with nothing. They do contain menthol ("M"), are somewhat lemony ("L"), and supposedly suppress coughs ("C"). They come from Walgreens, which would lead one to expect a "W," despite that letter's otherwise negative connotation during recent years. But the letter "B" appears to have no relevance whatsoever to either the product or the brand. What gives?

I call bullshit ("B").