1-2 days: You should start to feel better from the intramuscular penicillin shot they probably gave you (that's what the shot in the butt usually is) in 1-2 days assuming you have something that it treats. If your infection is actually viral or due to a bacteria other than group A strep, it will not respond to the antibiotics. In that case you should follow up with your doctor.
Answered 5/11/2014
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