Dextromethorphan Hydrobromide Indications Metodex is indicated in Chronic dry cough or unproductive cough; Acute dry cough which is interfering with normal function or sleep. Pharmacology Dextromethorphan suppresses the cough reflex by a direct action on the cough center in the medulla of the brain. Dextromethorphan shows high affinity binding to several regions of the brain, […]