Metaproterenol, Oral: Drug Information. Facts and Comparisons Retrieved September 18, 2016, http://online.factsandcomparisons.com/MonoDisp.aspx?monoID=fandc-hcp13343&quick=500286%7c5&search=500286%7c5&isstemmed=True&NDCmapping=-1&fromTop=true#firstMatch
Metaproterenol, Oral Prescribing Information. Retrieved September 18, 2016 https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=cf566e38-f6ff-4b86-9537-8684943b36eb
Metaproterenol, Oral Information UpToDate Retrieved September 18, 2016 from https://www.uptodate.com/contents/metaproterenol-orciprenaline-drug-information?source=search_result&search=metaproterenol&selectedTitle=1%7E13