how can allergic reaction kick in so fast while medicine will show effect after some time
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Your body is good at protecting itself and sometimes they overreact causing allergies. Pathogens (foreign stimuli) invade the body and the body freaks out because it’s something new so the body will send or produce fighting agents (white blood cells) to fight against it ie rash, hives, conjunctivitis, or severe cases as anaphylaxis.
Medication wise, it depends which form or route it is. If tablet/capsule form, the body has to digest it first or Enteral route that’s why it takes a while to take effect. Diphenhydramine is a good example of this.
If the medication is in liquid form, it can be through Parenteral route ie intravenous, subcutaneous, intradermal, intramuscular injections that goes directly to the circulatory system thus seeing results faster. (Epi-pen) is a good example of this.
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