chemical cosh
n.— «DHD is a highly controversial psychiatric condition that’s never been scientifically proven. The drugs, commonly known as the “chemical cosh,” are a mental health ASBO, where children are being given chemical restraints to curb poor behaviour.» —“Are children being given too many drugs” by Naomi Canton Norwich Evening News (United Kingdom) Aug. 21, 2006. (source: Double-Tongued Dictionary)