Our expert says:
Most breast cancers are sensitive to oestrogen, and their growth is increased in the presence of this hormone. Tamoxifen works by blocking these oestrogen receptors, thereby blocking the effect of oestrogen on the cancer. This reduces the size of oestrogen-sensitive tumours.
The more common side effects include:
suppression of menstrual periods
Disturbances of the gut such as diarrhoea, constipation, nausea, vomiting or abdominal pain
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