Can Long Term Usage Of Crominic And Flexon Cause Any Side Effects?

Hi .. My daughter is 09year and she faces the cold and breathlessness with every change in weather.. her doctor gives her Ventorlin, Crominic syrup and Flexon (SOS). Wanted to check if these medicines which are taken atleast 3-4 times a year for a duration of 7-10days is that ok.. i mean healthwise... or is there any other alternate precaution/ medication which can be taken to increase the immunity . fyi she is very skinny her weight is 30kgs and doesnt eat properly... she often complains about muscle pains in legs. thanks in advance for your help :) Kidn regards Anu