Furthermore, essentially the same proportion of patients reported no benefit from either type of treatment."-receptor and their ability to cross the blood-brain barrier.
The most common adverse effect is sedation; this "side-effect" is utilized in many OTC sleeping-aid preparations.
Once released, the histamine can react with local or widespread tissues through histamine receptors.
Histamine, acting on H-antihistamines help against these effects, they work only if taken before contact with the allergen.
Information is based on review of scientific research data, historical practice patterns, and clinical experience.