Don't count on it. While the most painful shot I have ever gotten personally was gamma globulin (really really painful), the worst one I have heard of was penicillin. Not Procaine penicillin like you get today with Procaine, a lidocaine-like local anesthetic mixed with the penicillin, but the raw deal like they used to give farm animals. Now, even that is more humane, but from what I gathered, it was not uncommon for people to faint when getting the unmixed shots back in the day because it felt like someone was pushing jello under their skin. Very nasty. The old rabies shots (multiple injections over a short duration) were pretty awful too.
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