Is It Safe To Give Ephedrex And Levolin For Cough And Congestion In Infants?

My baby is suffering from cold n cough since 5 days. He is taking medicine namely - ephedrex, ZnD, levolin, LCZ. But having very less relief. Currently he is not able to drink milk due to the congestion of cough in throat. He is trying to vomit but unsuccessful to release his cough. Even he cant sleep properly and crying alot. Plzz advise.