What happens if you stop taking letrozole for a few days?
Stopping letrozole for a few days could reduce its effectiveness in preventing breast cancer recurrence. Letrozole works by continuously lowering estrogen levels in your body to keep hormone receptor-positive cancer in remission. Missing doses means your estrogen Show Full Answer
What happens if you stop taking letrozole for a few days?
Stopping letrozole for a few days could reduce its effectiveness in preventing breast cancer recurrence. Letrozole works by continuously lowering estrogen levels in your body to keep hormone receptor-positive cancer in remission. Missing doses means your estrogen levels might rise temporarily, which could allow cancer cells to grow.
If you're considering stopping because of side effects, it's really important to talk with your oncologist first. They can help you manage symptoms or potentially switch you to a similar medication like anastrozole that might work better for you.
Some MyBCTeam members have successfully switched medications when side effects became too challenging. One member shared: "I was miserable on letrozole with pain and insomnia. My oncologist switched it to anastrozole, and I'm much better."
Don't stop taking letrozole without medical guidance, even for a short time. Your healthcare team can work with you to find solutions that keep you protected while addressing any concerns you're experiencing.
November 21, 2025
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