RIO DE JANEIRO, BRAZIL - When a crisis like the one caused by the novel coronavirus emerges, there is no time to develop specific means to tackle it. New drugs need a great deal of time to test their safety, but there is a way to skip a few steps.

The story of Viagra, created to treat angina pectoris, is well known, as it became a sales success only when it was discovered that it favored erection. Something similar is happening with the drugs for the Covid-19: drugs with other purposes are being reused, in the search for some that . . .

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