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Tamoxifen and soy isoflavones not compatible ??

Tamoxifen and soy isoflavones not compatible ??

I have been prescribed tamoxifen few days ago by the hospital and they gave me a special phone number to check the drug interaction with other supplements or prescribed drug.

So I phoned up the number and listed out the supplements I normally take, to see if there is problem with tamoxifen.

This afternoon they phoned me back and told me to stop taking soy isoflavones and ginko biloba supplements. They said that soy isoflavones would affect the performance of tamoxifen. Any one heard this before?