how can allergic reaction kick in so fast while medicine will show effect after some time
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Medicine you take by mouth takes a while to get from your mouth->stomach->blood. It also takes a little while to get the concentration of the medicine in your blood to the level where it actually works
That said, you can skip the whole stomach thing by injecting medicine into your blood directly. There’s a drug called adenosine, which is used to reset someone’s heart when they have a dangerous heartbeat. They inject it and within seconds, the patient can feel it. [This](https://youtu.be/WBQrddqWhzo?si=io1jOT-NppO-RidG) is an interesting video showing it in action
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