 Caffeine pheniramine phenylephrine sodium citrate sodium salicylate and Mastussin DM Drug Interactions - Drugs.comDrug interactions between caffeine pheniramine phenylephrine sodium citrate sodium salicylate and Mastussin DMApplies to: Mastussin DM dextromethorphan guaifenesin and caffeine pheniramine phenylephrine sodium citrate sodium salicylate 