Suggest Remedy For Allergic Dry Cough In A Child

My daughter is 7 years old and we are out station. She is having a allergic dry cough we gave her 10 ml bicarex Cyrup at 8.00 pm
Her cough is not stopping from last 1 hour. What should I give her to stop and please suggest me some solutions to this cough as this happens to her when there is change of whether