Et stort randomiseret klinisk forsøg (WHI- studiet) viste som sekundært resultat en øget risiko for iskæmisk slagtilfælde hos raske kvinder i kontinuerlig behandling med kombineret, konjugeret østrogen og MPA.
Stroke One large randomised clinical trial (WHI-trial) found, as a secondary outcome, an increased risk of ischaemic stroke in healthy women during treatment with continuous combined conjugated oestrogens and MPA.