Yasmin contains the same active ingredients as Yaz but a slightly higher oestrogen dose. Isabelle and Petibelle have exactly the same dose of active ingredients as Yasmin. They should all work in exactly the same way in the body, and be just as effective at preventing pregnancy.
Side effects on Yaz are less likely to occur when compared to these higher strength treatments, so that’s something to consider when choosing a treatment if you’re sensitive to oestrogen in particular.