Drug discovery crude preparations are morphine, the active agent in opium, and digoxin, a heart stimulant originating from Digitalis lanata. Organic chemistry also led to the synthesis of many of the natural products isolated from biological sources. Historically, substances, whether crude extracts or purified chemicals, were screened for biological activity without knowledge of the biological target. Only after an active substance was identified was an effort made to identify the target. This approach is known as classical pharmacology, forward pharmacology, or phenotypic drug discovery. Later, small molecules were synthesized to specifically target a known physiological/pathological pathway, avoiding the mass screening of banks
Drug diversion Drug diversion Drug diversion is a medical and legal concept involving the transfer of any legally prescribed controlled substance from the individual for whom it was prescribed to another person for any illicit use. The definition varies slightly among different jurisdictions, but the transfer of a controlled substance alone usually does not constitute a diversion, since certain controlled substances that are prescribed to a child are intended to be administered by an adult, as directed by a medical professional. The term comes from the "diverting" of the drugs from their original licit medical purpose. In some jurisdictions, drug diversion programs