Utviklingen av p-piller var først basert på reduksjon av østrogendose, deretter antatt bedre gestagener
Metaanalyser av observasjonsstudier viser økt risiko for tromboembolisme ved bruk av tredjegenerasjons p-piller sammenliknet med annengenerasjons p-piller (relativ risiko 1,7)
Tredjegenerasjons p-piller synes å gi 40 – 55 % lavere risiko for hjerteinfarkt enn annengenerasjons p-piller
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