Chinese authorities have ordered the recall of two contaminated leukaemia drugs blamed for adverse reactions among child patients.
Most of the drugs, produced by a pharmaceutical company in Shanghai, have already been recovered and authorities have reportedly tracked down the remainder.
Authorities suspended production and sale of methotrexate and cytarabin hydrochloride, after receiving reports that several child leukaemia patients experienced difficulties in walking after being injected with them.
The drugs had also caused urine retention among some leukaemia patients.
The health ministry and the State Food and Drug Administration said the drugs were contaminated with an anti-cancer medicine which had been mistakenly blended in during production.
Factories manufacturing the drugs have been closed.
China has announced new measures to tighten up on food and drug safety following recent scandals over dangerous Chinese-made goods reaching the market at home and abroad.
Mass food poisonings occur regularly in China due to lax food standards.
The former head of the State Food and Drug Administration, Zheng Xiaoyu, was executed last month following his conviction for taking bribes to approve hundreds of medicines, some of which proved dangerous.
