Question

All antihistamines inhibit the action of the compound histamine which causes inflammation in the body. This drug is classified ___.
A.On the basis of pharmacological effect
B.On the basis of drug action
C.On the basis of chemical structure
D.On the basis of molecular targets

Answer 1

Histamine is a natural nitrogenous compound engaged with nearby insusceptible reactions, just as controlling physiological capacity in the gut and acts as a neurotransmitter in the neural system, uterus and the spinal cord. It is also involved in the inflammation action at the site of injury, injured tissue or organ. The site inflamates with the production of histamine from basophils and mast cells and also creates redness around the area.

Complete answer:
Antihistamines are drugs which treat hypersensitive rhinitis and different sensitivities. Commonly individuals accept antihistamines as an economical, nonexclusive, over-the-counter medication that can give help from nasal clog, wheezing, or hives brought about by dust, dust vermin, or creature sensitivity with hardly any negative effect.
Characterization of antihistamine is based on its drug activity:
It lessens the impact of histamine by acting against it and causes inflammation of the injured area.
Antihistamines are additionally used to prevent or soothe the symptoms caused due to hay fever and by different sorts of hypersensitivity. They work by inhibiting the impacts of a substance called histamine, which is created by the body.
Histamine when released in the body can cause symptoms of running nose, watery nose, wheezing and itching.

Thus, the correct option is B.

Note:
Histamine produced by the activation of basophil or mast cells increases the diameter of the capillaries allowing more blood to flow and increases the amount of white blood cells and other proteins, which proceed to target and attack foreign bodies in the affected tissue.