Caugh and Cold. Cough is there. suggest.

Hi Team, My 6 month baby suffering from cold and cough from last two weeks. Consulted the nearest pediatric suggested for 3 drops eg:SPORIDEX DROPS, KUFRIL-LS, MAXTRA After use of five days his cough and clod not decreased. Hence we have consulted our pediatric and he suggested to take only maxtra for next 3 days and given physiomer for 4 days. After used of 3 days on last Sunday my baby boy caugh is not decreased.. He coughed like any thing. Then I visited to Same rainbow but unfortunately our regular pedeatric was on leave so consulted with other Paediatrics.. She suggested to not give any more medicine because he is taking from last 8 days. She suggested to do the nebulazation twice for 5 days. She is prescribed levolin 0.3 mg. However I have taken levolin of 0.63 me. Medicine store person there is no difference between 0.3 me and 0.63 mg.I have giving this 0.63 me from last two days. Is there any problems to give the 0.63 me levolin. Still his little bit cough is there. Suggest .