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Letrozole: When will I start feeling/seeing side effects?

Breast Cancer | Last Active: May 19 10:48pm | Replies (145)

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@lgay

I will stop my 5 years of letrozole in 8 days. When I first started I was so afraid of side effects I cut pill in half (did not have permission and did not tell the doc until later).

I started 1 whole pill after 3-4 months of spliting pill and then confessed to the doctor. Splitting is NOT recommended per package insert and they “have no data to approve efficacy of a split pill,” but that is water under the bridge now.

I’m surprised that your doc approved the split but I have always wondered if it still works.

I know Letrozole is absorbed in the jejunem where the pH is 4-6, and not in the stomach where the pH is 1-2. Even though the letrozole would have been exposed to an acidic aqueous environment, it is a stable in acid. It is soluble in dicholomethane.

Either way I’ve done 4.9 months of full dose and I’m going to celebrate when I’m done.

I hope you can tolerate the full dose.

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Double-blind, Randomized Trial of Alternative Letrozole Dosing Regimens in Postmenopausal Women with Increased Breast Cancer Risk
This research article found supporting evidence for Lestrozole at lower doses. Changes must be discussed with doctors though.