Is It Safe To Take Fexofenadine And Piriton Together?

Can you take fexofenadine and piriton together as my granddaughter takes fexofenadine in the morning , she is also on co-moxiclav for an infection at moment , but she thinks she has had a slight reaction as her tongue was sore and started itching . But last night her antibiotic disobedience in her mouth as had job to swallow it, hence why she thought can she take a priton