What do dreams about having an injection mean?
Injection Dream Meaning
Clearly, a syringe could be a phallic symbol so your dream may be saying that you need to inject more enthusiasm into your sex life. Similarly it may be telling you to inject more fun, determination or enthusiasm into your life. Injections imply healing and protection so this dream may be showing you ways to become more psychologically fit. If you are injecting drugs it can show that you are addicted to a behaviour pattern that may need to be modified.
A dream interpretation from the 1930’s says that dreaming of being injected means you will be free of enemies who are plotting against you.