Drug Search Engines
http://druginformer.com
http://ilpriorauth.com
http://pillbox.nlm.nih.gov
http://healthbee.co
http://myhealthbox.eu/en/
http://rxisk.org/drug-search/
http://drugbank.ca
http://mims.com
http://sideeffects.embl.de
https://www.erowid.org/psychoactives/psychoactives.shtml
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Pubmed (https://pubmed.ncbi.nlm.nih.gov/)
I have found this useful in the past.