SciFinder Scholar: Limit to patents, as patents are great sources for information on chemistry and manufacturing processes.. Find manufacturing of drugs and devices. This is a great place to start looking for information about your drug product’s active ingredients, formulation, and excipients because it covers the chemical literature and patent literature.
US Pharmacopeia General Chapters contain analytical standards, assays and quality control information. Monographs contain Drug "recipes." Try General Chapter 1151, "Pharmaceutical Dosage Forms."
FDA Drug Databases: Approval histories can provide valuable background. Find package inserts and much more.