If you are given an injection in a dream, it can be a sign that you are healing from a trauma.
A vaccine to prevent infection is often given in the form of an injection, so receiving an injection in a dream can be your dreaming mind’s way of warning you to be aware of negative influences and try as hard as you can to avoid them.
Being given an injection in a dream is sometimes a sign that you feel your personal space has been invaded.
If you dream that you are giving an injection to someone else, your dreaming mind could be telling you that you are forcing yourself on other people. You are being too overbearing; your relationships will be more positive if you allow others to have their space.
Sometimes, an injection in a dream represents a short-term gain.