BEIJING – China is warning its citizens against some questionable and risky attempts at self-treatment amid surging coronavirus infections, as the nation seeks to tackle panic-buying of drugs following an unexpectedly swift unwinding of its Covid Zero policy. The People’s Daily, the Communist Party mouthpiece, admonished the practice of mixing or taking more drugs to nurse a fever, while quashing speculation that the World Health Organisation had advised against taking ibuprofen. Separately, the Beijing Evening News cautioned that overdosing of medicines could lead to liver failure. The state-controlled media also pushed back against long-held false beliefs that canned yellow peaches...