An investigation of the phenomenon was prompted by reports of menstrual disorders after receiving one or two injections of either Moderna or Pfizer-Biontech vaccines.
Menstrual disorders can occur for a variety of reasons, including underlying medical conditions as well as stress and fatigue. Health authorities have emphasized that similar cases have also been reported after covid-19 infection, writes Reuters.
Absence of menstruation is defined as no bleeding for a period of 90 days or more.
At the same time, the EMA’s investigates Risk Assessment Committee for Pharmacovigilance still cases of heavy menstrual bleeding linked to the two vaccines.
Reports of heavy menstruation were highlighted as a potential problem after a study in Norway indicated an increase in cases of the phenomenon after vaccination against covid-19.
Heavy menstruation means bleeding of increased volume and / or duration that disturbs the quality of life.
On Friday, the committee said it had reviewed all available information but had asked vaccine manufacturers to provide updated data.
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