Psychological problems after mefloquine and chloroquine

EDITOR,--Most doctors will have taken chloroquine for short periods when travelling to exotic destinations. I had done so in Egypt, Jordan, and Syria: I had taken chloroquine for six weeks at any one time and felt confident about taking it for two years when I came to Papua New Guinea. Initially I felt well, but after one month I became lethargic and would fall asleep in meetings. I had early morning waking and …