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Hello, I want to ask the doctor, what is the solution in the small glass tube that looks like a bullet when mixing penicillin injection?
Problem analysis:

You should be talking about ampoules, if it is intramuscular injection of penicillin, because it is a powder that needs to be dissolved.

Suggestion:

You need this ampoule, which contains water for injection. Simply dissolving penicillin has no therapeutic effect.