The tester and chief physician Dr. Piacenza informed Grünenthal that one of his patients felt “light paresthesia and tingling in his legs” after taking K 17.

Source: Anklageschrift (indictment) from 1967, today archived at the National Archives of North Rhine-Westphalia in Duisburg, Germany (Rheinland Division, Gerichte Rep. 139, No. 1–396), p. 75.

Note: Dictionary definition of “paresthesia”: an abnormal sensation, typically tingling or pricking, “pins and needles”, caused chiefly by pressure on or damage to peripheral nerves.