I've never thought about it. It's just a topical painkiller (benzocaine), but I'm sure it'd work on them too.
I used to carry an Epi-pen with me too, just in case we got swarmed, but they require a prescription. I can get my allergy doc to write me one because I take allergy shots at home, but the ones I have are several years old and I'm sure I need to throw them away. I just hope to goodness that I'm never in a situation where I need one. I can't think of much worse than to be swarmed by bees of any kind. That's one reason I don't like to ride in the back of the line in a group of horses. The lead horses stir them up and the last horses get the worst of it. I've been popped a time or two, usually in the fall when they are the most irritable, and it ain't fun.
If I was going way out, away from medical care I would want an epi pen and a snake kit. I knew a doctor that even carried suture. His teenager got cut while camping one day. He was furious with his dad. He had brought everything but the lidocaine:')