Thanks for your query.
Relax,your child is having hyper reactive disease for which doctor has prescribed levolin
Prescribe medication as per doctor's advise and be in regular follow up.
Inhalers are totally safe.It is a mode of delivery of drug.
Less amount of medication is used as compared to oral route and it acts directly to target organ that is lungs,so side effect is less.
Wishing your child good health.