Is it safe to take gravol and benylin (dextromethorphan) together? cough/cold symptoms keeping my husband awake, has taken benylin (dextromethorphan) but wants the gravol to help him sleep

Cough and Cold: Benylin (dextromethorphan) is used as a cough suppressant which could help your husband rest. Gravol is an anti-emetic which is taken to suppress nausea and vomiting. They may be taken together but neither is used for sedation or sleep; however, he is probably exhausted and relieving him of cough and vomiting will help him sleep. Keep well hydrated and warm. If symptoms worsen over the next 48 hrs seek medical care