I'm really worried about my dad's asthma. He's been using Serollo 250 for the past 5 years because his asthma specialist recommended it. However, lately, every time we get a new one, it seems defective and isn't helping much. His asthma symptoms are actually getting worse, and Im really concerned. Is there an alternative to Serollo 250 that we might be able to find at local stores? I've attached a pic of the product if that helps.