antihistamines are vasodilators so expect a significant drop in your blood pressure if you abuse it. normally they'd just make you drowsy.
you could get dizzy or faint and i suppose in extreme cases you could not deliver enough blood to your organs-- you can actually get a heart attack from LOW blood pressure, as well as kidney failure, and a bunch of other shit when you destroy your natural homeostasis.
i wish more people learned a bit of physiology before they start fucking with their body just for kicks.
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