I have old Sinus Rinse packets that I bought for my son. The box has 10 21 04 stamped inside. Since they are made without preservatives are they safe

There is lot of medical literature available that suggests the benefits of placing a vial, ampoule or respule of corticosteroid Budesonide in the NeilMed sinus rinse solution. This allows better distribution of the corticosteroid drug in the nasal and sinus passages and in turn reduces the inflammation. Reduction in inflammation may help shrink the size of the polyp and reduce your symptoms.