Why not try Piriton Syrup?
Contains chlorphenamine. Always read the label.
Tried and trusted for over 50 years, Piriton Syrup contains an antihistamine called chlorphenamine and provides fast and effective relief from the symptoms of hayfever and other allergies. Suitable for adults and children aged 12 months and over, Piriton can also be used to relieve the itchy rash of chickenpox, and, because some people experience drowsiness when using this medicine, it can aid restful sleep when symptoms are troublesome at night.
There are also tablets and syrups in the Piri range, click here for more information