4 definitions of HPR. Definition of HPR in Business & Finance. What does HPR stand for?
According to the Centers for Disease Control (CDC), you should allow two weeks after getting a flu shot to develop protection against the flu. That's because after vaccination, the body has to work for a while to create the protective antibodies to the flu virus. Bear in mind, though, that there's a lot of variation in how fast different people's immune systems work.
How long will it take the birth control shot to work? Sometimes if you take it at the right time then it works immediately. Like I've heard it's the fifth day after a period or the fifth day of a period. I had my shot about 3-4 days after my period ended. So will it work immediately or will I have to wait?