Hi @Kylie71, the reason they will change you to Tamoxifen is because if you are premenopausal Tamoxifen gives a better chance of stopping recurrence. I've been on it now for 18months and had a blood test in October that showed I've now been pushed into menopause but my oncologist said you can swing between being premenopausal and menopausal for around 2 years so I'm to stay on Tamoxifen until July (2 yr mark) and then change to an aromatase inhibitor. Tamoxifen still covers you if you go into menopause but an AI won't cover you if you swing back to being premenopausal. So even with side effects I'm happy to be on Tamoxifen. And I like you start to get a bit anxious when I think of changing to another medication and what the side effects may be. But who knows we could both be far better off on the other medications. Best of luck with it and let us know how you're getting on. Xx