<unk> , also known as hypostamine, is an inhibitor of the enzyme histidine decarboxylase and therefore an atypical antihistamine, used for the treatment of urticaria and allergic rhinitis with no known adverse effects.[citation needed]
Tritoqualine
Benzoctamine
Demecarium bromide
Dimethyltubocurarine
Methaqualone
Bentoquatam
Bethanechol chloride
Benzalkonium chloride