If bleeding continues, tell your doctor or breast care nurse. This side effect is uncommon but some women experience pain and stiffness in their joints while taking Arimidex. Let your doctor know if these effects are troublesome. It may be helpful to take mild painkillers. Tiredness and lethargy .
Some people can experience increased tiredness.
It is important to get plenty of rest. Weight gain . Weight gain can be a side effect of Arimidex. This is due to water retention which is not harmful but can be uncomfortable. Length of treatment.