The Hidden Cost of Antihistamines: How Blocking Histamine Silences Your Most Important Neural Network — section

Millions of people take antihistamines daily &#8212; for allergies, for sleep, for mast cell activation, for hives that won&#8217;t quit. And most of them have no idea that these drugs reach far beyond histamine. They&#8217;re quietly interfering with acetylcholine, the neurotransmitter that controls your gut motility, your memory, your vagus nerve tone, and your body&#8217;s master anti-inflammatory switch.