My son is a very occasional user--just has asthma symptoms when he gets another viral or bacterial infection. I just bought Xopenex ($$ ouch!) and I was dismayed to find that it was packed in a pouch of twelve that states is to be used within 2 weeks or it should be thrown away. My question is why wouldn't the medication be preserved just the same if it is protected from light by the foil pouch and if it is protected from air by being vacuum sealed. Just trying to save money! Anyone want to weigh in on this???

Thanks! Jimmy's mom