To determine point of view's importance: Know whether events of the story are being interpreted by the author or by one of the characters. If interpreted by one of the characters: ask how this character's mind and personality affect his/her interpretations. ask whether the character is perceptive or imperceptive.
But in a poll done for The Wall Street Journal by NPD Group Inc. of Port Washington, N. Y., 70% of 1,000 respondents said they probably wouldn't take a prescription drug after its expiration date; 72% said the same of an over-the-counter remedy.
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.