Hello. I had lumpectomy in April and finished radiotherapy 4 weeks ago. I have been on anastrozole for 8 weeks. The last 2 weeks I have felt so very tired it been difficult to function. My doctor has done a blood test to rule any problems out but believes it due to the effects of radiotherapy and anastrozole. I expect the results next week. I have bought some metatone tonic which I have had in the past which is very good but wondered if it ok to take with the anastrozole. I thought this tiredness would after the first week or so. Best wishes to fellow sufferers. Jan