Will taking aller-tec for hives from swimming work?

Don't forget Epipen (epinephrine) Aller-tec or zyrtec (cetirizine) is a very good choice, but don't forget to swim with a buddy and have an epi-pen available. There are cases of swimming that triggers anaphylaxis in patients with cold urticaria.
A good choice. Aller-tec is the kirkland generic version of zyrtec or cetirizine. This is an effective antihistamine for hives. Remember to give it time to work - taking it at least an hour before swimming. Cetirizine causes drowsiness and slowed reflexes in up to 8% of users.