In in vitro experiments, Brompheniramine blocks muscarinic cholinergic receptors in human chinese hamster ovary (CHO) cells, sodium and calcium channels in CHO cells, as well as potassium channels in human embryonic kidney 293 (HEK-293) cells. Brompheniramine suppresses the transfected Nav _1.5 channels from myocytes.

Brompheniramine as an antihistamine blocks sodium channels. Brompheniramine (3.0, 1.5, 1.1, 0.6, and 0.3 μmol) treatment shows cutaneous analgesic effect with an ED ₅₀ value of 0.89 in a rat model of infiltration anesthesia. Subcutaneous Brompheniramine induces dose-relatedly analgesic effects, and Brompheniramine induces prolonged analgesic duration.