inject into

inject (something) into (someone, something, or some creature) and inject (someone, something, or some creature) with (something)

to give a hypodermic injection of something to someone or an animal. The nurse injected the medicine into my arm. He injected a very large dose into the patient.

inject something into something 

1. Lit. to squirt something, such as oil, water, etc., into something. The pump injected the oil into the wheel bearings when I squeezed the lever. The mechanic injected a solvent into the lock.

2. Fig. to put something, such as humor, excitement, etc., into a situation. Let's inject a little humor into this dismal affair. She likes to inject a lot of excitement into her books.