DrugDigest: Metoprolol ( Lopressor ) - Information on dosage, usage, side effects, interactions, and drug comparisons, including generics when available. - http://www.drugdigest.org/DD/DVH/Uses/0,3915,446%7CMetoprolol%2Boral,00.html
Toprol-XL - Features product and heart disease information for US residents and healthcare professionals - http://www.toprol-xl.com/
Toprol - Metoprolol succinate. Prescribing information for US residents. - http://www.astrazeneca-us.com/cgi-bin/az_pi.cgi?product=toprol&country=us
Metoprolol Succinate - Information from the RxList. - http://www.rxlist.com/cgi/generic/metopro.htm
Metoprolol Tartrate - Information from the RxList. - http://www.rxlist.com/cgi/generic/metopxl.htm