Advertisement @14pokies is actually right, your usual over the counter pain meds won't do a thing for a tarantula bite because they don't work on nerve pain. Tarantula venom = neurotoxin -> nerve pain. You'd need opioids, ie.e canabis or morphins. And in case of an OW bite you'd need heavy duty muscle relaxants, nothing you can just go and buy either. Some disinfectant would probably be a good idea, though, especially in case of a bite from large fangs with significant mechanical damage. Spider fangs aren't exactly sterile. So, I don't really have anything at home - about as much as anyone else .