Levolin 0. 63. Please help me!

Hello Doctors, My son has been prescribed nebulization using levolin 0.63mg 3 respules at a time followed by budecort respule yesterday night. He was running a fever of 102.2 and meftal 6ml was suggested. His mucus is thick and yellow. He has a fever of 100 today morning and I've given him 6.5 ml of calpol 250mg. But still congestion is present( chest x ray was advised and it was normal). Also doctor has suggested taxim 5ml twice a day along with Allegra 3.5 ml twice a day. Can I nebulize him again using the same...3 respules of levolin or it is not advised. I've actually read that levolin is not advisable under 6 years. I hope the treatment is correct. Need your valuable opinions. This is really important. Please help me Thank you