Justice for Dr Archna Sharma.(RIP mam) Stop killing doctors!!! Black day for us!!! Society , police, every human being should be ashamed!!!

The person will have severe allergic manifestation. He may even develop anaphylaxis. Anaphylaxis can kill a person.

There is nothing to worry for direct IV injection But have to wait if some allergy is there

Presuming you/person you're asking the question for has already taken the injection because of the manner in which you asked this question. There's a reason for everything in medicine. Without dilution it might not cause much beyond local thrombophlebitis. But patient needs to be monitored and checked by a doctor for local signs if any.