An independent large study conducted by MEDCO Health Solutions Inc. found that women treated with tamoxifen for breast cancer doubled the risk of the disease returning if they used antidepressants--in particular, Paxil and Prozac. The researchers used medical records to identify 353 women taking tamoxifen plus other drugs that might interfere with it, and 945 women taking tamoxifen alone. Those taking a drug combo did so for about a year on average.
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