
Dexbrompheniramine is an antihistamine with anticholinergic properties used to treat allergic conditions such as hay fever or urticaria. It is the pharmacologically active dextrorotatory isomer of brompheniramine. It was formerly marketed in combination with pseudoephedrine under the name Drixoral in the US and Canada. ...
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http://en.wikipedia.org/wiki/Dexbrompheniramine

(deks″brom-fәn-ir´ә-mēn) the dextrorotatory isomer of brompheniramine, having similar actions and uses as an antihistamine, but having approximately twice the activity by weight; used in the form of the maleate salt.
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http://www.encyclo.co.uk/local/21001
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