My Daughter 6 Yrs Old Has Some Seasonal Allergies So

My daughter 6 yrs old has some seasonal allergies so I started to give her the Loratadine 5mg at bedtime but she is having congestion coughing she feels tired her stomach was upset she threw up mucus no fever her dr had giving us the bromfed dm syrup a while back do you think this will help and if so what dosage.