Suggest Remedy For Running Nose And Light Fever

gud morning doctors.. I m from delhi, my son is 2.5yr old. whenever whether is changed he got catched into running nose and light fever. we are taking treatment for him from our pediatrician as and when req. first of all on first day we prefer and use home remedies to overcome the disease of our son then if no progress we ll go to doctor. we also seen him to one other pediatrician. both docs suggested MAXTRA which suits my son and get relief each time in only 2-3 dose. we are also giving IRON,CALCIUM AND VITAMIN supplements syrups to our son recommeded by our pediatrician. I want to know which is the best medicine which is no/less harmful to be given to any kid in case of cough,cold and fever? and Is Paracetamol and ammoxyciline is harmful for kid under 5yr. pl guide with your valuable suggestions. Thanks and regards, Malkeet