Anastrozole and letrozole are both aromatase inhibitors used to treat hormone receptor-positive breast cancer, and studies show no significant difference in their overall effectiveness or quality of life.
Both medications share many similar side effects, including:
- Hot flashes
- Bone density loss
- Vaginal irritation
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Anastrozole and letrozole are both aromatase inhibitors used to treat hormone receptor-positive breast cancer, and studies show no significant difference in their overall effectiveness or quality of life.
Both medications share many similar side effects, including:
- Hot flashes
- Bone density loss
- Vaginal irritation
- Gastrointestinal issues
- Sleep difficulties
- Some joint pain
- Possible weight gain There are some differences worth knowing. Letrozole tends to reduce estrogen more aggressively, which may lead to more significant joint pain compared to anastrozole. People on letrozole were also more likely to stop treatment early due to joint pain.
Anastrozole-specific side effects can include mood changes, dry mouth, hair thinning, and tingling in the hands or feet. Both medications work best after menopause, or in combination with ovarian suppression for premenopausal women. Because everyone reacts differently, it's worth discussing any side effects with your care team — switching medications is common and doesn't mean treatment has failed.
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