One cetirizine tablet a day that should have read. Rhere are some branded tablets that are cetirizine (I think Pititon now market one as 'non-drowsy') but I have never spotted a difference between them at up to £5 a box and the generic ones from supermarkets and discount shops at 79p! Standard Piriton (chlorphenamine) sedates most people which is probably why hubby feels so groggy. You may be able to get round it if you can convince him to drink strong coffee but the crash from that later on is probably even worse :-(