We've been using After Bite for some years now, we go over to Corfu every year for a couple of weeks and this stuff is essential, the idea is as soon as you feel the little blighters have a nip then whack After Bite on immediately,just a couple of drops and it takes the intial sting away and also stops swelling, it also works on wasp stings as I found out. It comes in a small dropper type bottle and fits nicely into a pocket or purse. We also use it over here in the UK as well.
After Bite is NOT an insect repellent and if going to places with high mozzie counts then an insect repellent is a must, After Bite is for treatment of bites and stings and works very well, After Bite is an ammonia based treatment and is a little smelly, it must not be used on broken skin.