European Medicines Agency re-investigates reports of menstrual disorders after mRNA COVID vaccination

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Meeting highlights from the Pharmacovigilance Risk Assessment Committee (PRAC) 7 – 10 February 2022‎ ‏‏‎‏‏‎ ‏‏
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PRAC reviewing cases of period irregularities with mRNA COVID-19 vaccines

The PRAC is assessing reported cases of heavy menstrual bleeding (heavy periods) and absence of menstruation (amenorrhea) with the mRNA COVID-19 vaccines.

In view of spontaneous reports of menstrual disorders with both vaccines and of findings from the literature, the PRAC decided to further assess occurrences of heavy periods or amenorrhea following vaccination.

EMA will communicate further when more information becomes available.

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COVID-19 vaccines linked to small increase in menstrual cycle length


January 25, 2022

At a Glance
  • Women who received COVID-19 vaccines had a less than one-day increase in the length of their menstrual cycles around the time of their doses.
  • The findings suggest that women may have a slightly longer menstrual cycle after COVID-19 vaccination, but the change is temporary and within the range of normal variation.
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