Levolin is a bronchodialator and helps in reducing wheezing which might be associated with respiratory tract infections. It is frequently in children and usually no side effects are observed since it is delivered directly to the target organ without requiring to get mixed in the blood stream. If side effects are to occur, it primarily includes increase in heart rate. Do not worry, it is safe to be given to children. The fever is due to the respiratory tract infection that is frequently caused by certain viruses and irrespective of use of medicines, it usually takes 5-7 days for the fever and cough to resolve. Give paracetamol to bring down the temperature. You would have to be a bit patient. A very good home remedy of cough is steam inhalation. Just place the child before a source of steam. The water vapour will be in the air and automatically the child will breathe it in. It will help in diluting the cough and would provide relief.