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Global demand for Pfizer's oral Covid-19 antiviral treatment Paxlovid has been unexpectedly low due to complicated eligibility requirements, reduced testing, and potential for drug interactions, according to a media report. Demand also has been hampered by the perception that Omicron infections are not that severe. Paxlovid was expected to be a major tool in the fight against Covid after it reduced hospitalizations or deaths in high-risk patients by around 90 per cent in a clinical trial. Thousands of people still die from Covid-19 every week, even as global infections are far off their peak. And there are only a few proven antiviral treatments, of which Paxlovid is the most attractive. The others are Merck & Co's far less effective rival pill molnupiravir, and Gilead Sciences' intravenous remdesivir.