Metformin appears to play a role in preventing long COVID when taken early during a COVID-19 infection, according to a new preprint study.
In particular, metformin led to a 42% drop in long COVID among people who had a mild to moderate COVID-19 infection.
The researchers included patients who were ages 30-85 with overweight or obesity, had documentation of a confirmed COVID-19 infection, had fewer than 7 days of symptoms, had no known prior infection, and joined the study within 3 days of their positive test. The study included monthly follow-up for 300 days, and participants indicated whether they received a long COVID diagnosis from a medical doctor, which the researchers confirmed in medical records after participants gave consent.
Among the 1,323 people studied, 1,125 agreed to do long-term follow-up for long COVID, including 564 in the metformin group and 561 in the blinded placebo group. The average age was 45, and 56% were women, including 7% who were pregnant. The risk reduction for metformin was 42% versus the placebo, which was consistent across subgroups, including vaccination status and different COVID-19 variants.
Several risk factors for long COVID emerged in the analysis. About 11.1% of the women had a long COVID diagnosis, as compared with 4.9% of the men. Also, those who had received at least the primary vaccine series had a lower risk of developing long COVID, at 6.6%, as compared with 10.5% among the unvaccinated. Only one of the 57 people who received a booster shot developed long COVID.
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