I have taken all of the aromatase inhibitors including tamoxifen. My understanding, from every expert I have talked with, is that these drugs, including the one you have been Prescribed, are a critical part of your treatment. There are side effects and everyone reacts differently. For me it was joint pain and skin issues - I'm still struggling with both. The thing you have to weigh is the cancer. I'm assuming that you want to do everything possible to prevent reoccurance. I felt like I couldn't manage the skin issues without getting off the drugs. I started, stopped, switched and tried again - repeatedly. I never completed the entire recommended 5 years. But, I wish I could have. For me the fear of reoccurance seems to still loom large. I had a scare and biopsy last spring. I guess if you trust your oncologist I would listen carefully to his/her recommendation. Wishing you the best and a future cancer free. Maureen