 Although he found it to be a highly effective – and enjoyable – painkiller, he was somewhat alarmed by its psychoactive effects and subsequently tried to limit his use of the drug.Like many of his fellow prisoners, Large also suffered from beri-beri and dysentery.In March 1953, a Chinese doctor operated on Large and removed a tracer round from his ribs as a preliminary to his being released as part of an exchange of wounded prisoners.