Alupent and Metaprel Full prescribing information from RxList. http://www.rxlist.com/cgi/generic2/metaproterenol.htm
Metaproterenol - Familydoctor.org Information for patients in English and Spanish. http://www.familydoctor.org/cgi-bin/multum.pl?op=GetLeaflet&id=12450&name=metaproterenol
