Your husband first needs to get allergy tests
done either in the form of blood tests, specific IgE against pollens, house dust mite, animal dander etc OR skin prick tests against these allergens.
This will help identify what the allergens are and take avoidance measures to lower further exposure.
LC is a combination of levocetirizine
and montelukast; levocet being an antihistamine and montelukast being a leukotriene inhibitor that works well for the airways.
He will also need a lung function test with reversibility studies to see if he has developed asthma
or is in the early stages.
Only then the recommendation of bronchodilators as inhalers can be made. Asthalin
is a short acting bronchodilator that he can use whenever he feels short of breath but it is important that he keeps a note of the number of times and puffs he has used to let the chest physician know when the lung function report is in front of him.
Long term use of both the medications has little side effects so it is fine to continue provided there is a reason to continue this.