When I was 14 years old or so, I was at a picnic and was stung on the arm by a few yellowjackets. I developed a noticeable reaction and was driven to a nearby clinic by a relative.
It was a Sunday evening, I believe, and there were only two or three nurses on staff at the time. One of them led me down a long hall and into a room, where she treated my stings with lotions which helped, but she informed me that I would need a couple of shots, and that another nurse would be in shortly to give them to me.