Tamar Kahn’s report on the use of ivermectin for Covid-19 patients omits an important consideration that should be applied by clinicians grappling with the health-care crisis sweeping the world (“Using ivermectin for Covid-19 is risky and unethical, say government advisers (https://www.businesslive.co.za/bd/national/health/2021-01-11-using-ivermectin-for-covid-19-is-risky-and-unethical-say-government-advisers/)”, January 11).

In 1964 the World Medical Association adopted the Helsinki Declaration after careful debate and deliberation. Its principle 37, taken from the current (2013) revised version, reads:..

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