Image: 4 panels organized in a rectangle following a sequential order like a comic strip. The first panel is of a man with a very serious face stating, "Hey man, got any diphenhydramine?" The second panel is a grainy picture of the actor Tony Stark with a slightly inquisitive face and saying, "What's that?" The third panel is an identical copy of the first image and saying, "Benadryl the allergy medicine." The fourth and final panel is a grainy picture of Tony Stark rolling his eyes and taking a deep breath.
I was going to say. That was just common practice in my native country. We did use the most common brand names sometimes, but even then we used them interchangeably (if we asked for Nurofen we really meant ibuprofen and didn't care if we got another brand; like asking for a kleenex)