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Chlorpheniramine, commonly marketed as its salt chlorphenamine maleate (CPM Chlor-Trimeton, Piriton, Chlor-Tripolon), is a first-generation alkylamine antihistamine used in the prevention of the symptoms of allergic conditions such as rhinitis and urticaria. Its sedative effects are relatively weak compared to other first-generation antihistamines. Chlorpheniramine is one of the most commonly-used antihistamines in small-animal veterinary practice as well. Although not generally approved as an antidepressant or anti-anxiety medication, chlorpheniramine appears to have these properties as well.