Return of the Quaaludes? Prolonged agitated delirium after intentional ingestion of the methaqualone analog SL-164 - a case report.

: A 22-year-old male with a known history of drug abuse presented to our department with prolonged agitated delirium, myocloni, tachycardia and subfebrile temperature after the deliberate ingestion of opium poppy tea ( L.) together with the methaqualone analog SL-164 (5-chloro-3-(4-chloro-2-methylphenyl)-2-methyl-4()-quinazolinone) which is sold online as a designer drug. : SL-164 and its hydroxy metabolites were detected in serum and urine via liquid chromatography-quadrupole-time-of-flight mass spectrometry (LC-QTOF-MS). : The pronounced delirium was treated with benzodiazepines and neuroleptics; temporary medical restraint had to be applied. Symptoms completely resolved over the next 72 h and the patient was discharged on day three able to give consent. : Although methaqualone was a popular and widespread sedative in the 1950s and 60 s before its discontinuation in the USA in 1985, derivatives of the methaqualone class have not previously played a large role as drugs of abuse in the rapidly growing market of new psychoactive substances. To our knowledge, this is the first case of agitated delirium with detection of SL-164 and hydroxylated metabolites in a patient's serum and urine.