Hello.
Tremors due to Duolin nebulisation is a very minor side-effect. The drus benefit way outweighs the side effect. So we do not have to be concerned regarding that.
It can be used long term without any issues.
However the choice of Seroflo inhaler can be discussed. Do consult a pulmonologist before any change.
Next Steps
Seek a Pulmonologist consultation.
Try to have all previous reports and his complaints on hand.
Health Tips
Nebulisation is better for Parkinson's.
If he has difficulty using the inhaler, do consult for change.