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The drug touted by the U.S. President Donald Trump as a possible line of treatment against the coronavirus comes with severe warnings in China and can kill in dosages as little as two grams.

China, where the deadly pathogen first emerged in December, recommended the decades-old malaria drug chloroquine to treat infected patients in guidelines issued in February after seeing encouraging results in clinical trials. But within days, it cautioned doctors and health officials about the drug’s lethal side effects and rolled back its usage.

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This came after local media reported that a Wuhan Institute of Virology study found that the drug can kill an adult just dosed at twice the daily amount recommended for treatment, which is one gram.

As the drug hasn’t been approved by the U.S. Food And Drug Administration to treat the disease known as Covid-19, the Chinese experience may be useful as the American regulator studies the medication which has been endorsed by Trump as well as Tesla Inc. chief executive officer Elon Musk.