English: pre-exposure prophylaxis
Welsh: proffylacsis cyn-gysylltiad
Subject: Iechyd
Welsh definition: Pre-exposure prophylaxis, or PrEP, is a way for people who do not have HIV but who are at substantial risk of getting it to prevent HIV infection by taking a pill every day.
Welsh context: Dechreuodd byrddau iechyd Cymru ddarparu cyffuriau PrEP (proffylacsis cyn-gysylltiad) ym mis Gorffennaf llynedd drwy glinigau iechyd rhywiol, fel rhan o astudiaeth dros dair blynedd.
Notes: Defnyddir yr acronym PrEP yn Saesneg.