When incompatible blood is given, antibodies and complement in the recipient plasma attack the antigens on the donor RBC. Hemolysis ensues The antigen-antibody complex activate the Hageman factor (factor XII), which acts on the kinin system to produce bradykinin
Still it is not advisable to take it after the expiry date written on the bottle. This is just for your information to let you know that you are safe. Anyway Saline Nasal spray is not going to do any harm even if you used an expired one. So forget about it.
Glucose tablets are good to keep on hand when you are on the go because they have a long shelf life -- about three years -- but always check the expiration date on the package. You can keep them in your bag or somewhere with you since hypoglycemia can happen unexpectedly, especially if you are busy.