Dear of troy: I hadn't heard of BromoSeltzer in years. I think that is the one that used to be popular with Boston drunks for hangover. I might be confused, but I think that is the one that used to have acetanilid in it. It was very effective, but caused methemoglobinuria, which gave the drunks a very noticeably blue face. Acetanilide with change in molecular structure is safe, and is now in Anacin.