The Drug Interaction API (http://rxnav.nlm.nih.gov/InteractionAPIs.html# ) is a web service for accessing drug-drug interactions. No license is needed to use the Interaction API.
The Drug Interaction API is available as a SOAP web service and as a REST web service. For information about the SOAP web service, please visit: http://rxnav.nlm.nih.gov/InteractionAPISOAP.html . For information about the REST web service, please visit: http://rxnav.nlm.nih.gov/InteractionAPIREST.html
The WSDL for the SOAP version is available at: http://rxnav.nlm.nih.gov/InteractionAPI.xml The base address for the REST version is at: http://rxnav.nlm.nih.gov/REST/interaction
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