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.
Best Answer: Most medicines are good for long after the expiry date if they are stored properly. (Cool, dark, and dry place). So, expired Chantix will do the same thing as normal Chantix. If it has been stored in the sun or on a car seat etc. it will probably do next to nothing even before the expiry date. Eventually, even if stored properly, it will eventually lose potency and eventually become useless. Source(s): Pharmacology Student.