 or maybe like a little rash. So this is what we call a side effect. But allergic reaction when you have rash all over your body, when you cannot take your breath. So this also we have to have clear this idea for patient first. Second, there's some medication that if you are allergic to it, and then you cannot take other medications. And I'm going to jump in here. One of the most common medication is the penicillin, which is an antibiotic.