I lost a piece of paper that said what I'm allergic to, I think it's an antibiotic that starts with an M. It it gives me a rash, my back starts to feel itchy, I had to take it for a blood infection. ## Hi igor, Antibiotics starting with "M" include: Meropenem, Mezlocillin, Meticillin, Moxifloxacin, Mafenide, and Minocycline. Do any of these names ring a bell? I'm sure there may be others out there, but this is what I could gather at the moment. I hope it helps! ## Metronidazole. Also interacts with propyline glycol, which is in liquid for e-cigarettes.