Resource Overview Platform: Proquest Link to Resource Connect to Resource Bibliographic citations to toxicological, pharmacological, biochemical and physiological effects of drugs and other chemicals. Coverage is international but contains primarily English language items; Updates are monthly, with about 9,300 new citations added each month; the file contains over 2.4 million records. The records are derived from about 16 secondary sources which do not require royalty charges based on usage. Citations may be retrieved by entering free text terms as they may appear in titles, keywords and abstracts of articles. The portions of the database derived from MEDLINE, DART, and that portion of BIOSIS added since August 1985 may be searched using MeSH vocabulary. Chemical substances can be searched by entering their corresponding CAS Registry Numbers and/or synonyms.