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

I am on anastrazole for two years now after chemo (Which i could not complete do to infection) mastectomy lymphnode removal and radiation. I did great up until the past few months. Most side effects were manageable or went away. As of late I feel 10 years older than I am (61) - hair is starting to thin for the first time. depression and anxiety increased and general malaise. I agree - who is checking the estrogen levels? Maybe for some of us it is too much. I asked if these can be taken every other day and have seriously considered going off completely and taking supplements. Has anybody's oncologist recommended supplements for hair thinning/loss?

Thank you mugs24cancer. I have been on both exemestane and anastrazole with horrific side effects but nothing digestive. Of course we don’t know that letrozole is the culprit 6 days in but it is the only change made. I will monitor it and if it progresses then I will have to do something. Next is Tamoxifin if letrozole if the problem. I gave a high risk recurrence rate with an oncotype score of 51. I am 71 but I am still active and working so I still want the best out of what life has to offer. Good luck with you and we will keep in touch for sure.

I have been taking letrozole for 6 months. When I take the full dose I often have abdominal pain, nausea and heartburn...wakes me up in middle of the night. If I take half a dose I have no side effects. My oncologist says there are no studies for the effectiveness of half a dose so he does not support it. He says nausea and heartburn are not side effects of letrozole thus he referred me to a gastroenterologist. I have had several tests and my insides are fine. I am following a GERD diet but still experience digestive issues when I try to go back to full dose of letrozole. May be trying exemestane In the future as it it is the only one I have not been prescribed. My digestive issues were worse on Tamoxifen. Also was diagnosed with gastritis then. Again, could not tolerate full dose of Tamoxifen but did fine with half dose. It is so hard to know the right thing to do. Hoping you get some answers and will stay in touch.

I am now on my 3rd AI - Letrozole. I am day 6 and this week I have had 2 attacks of so much pain in my right side and stomach area radiating to my back. I can’t be sure it’s the pills but so far my overall symptoms have been crazy I am sure they are. I will see doctor next week to see what it could be but I think I may be done with them. The only other option is tamoxifen. I am so sick and tired from being sick and tired and of course your mind goes to the What if’s.

@mom23boys Here are more Metastatic BC discussions:
- Metastatic breast cancer, in bones: Trouble eating https://connect.mayoclinic.org/discussion/medistatic-breast-cancer-in-bones/
- Brain Mets https://connect.mayoclinic.org/discussion/brain-mets/
- Immune system: Living with stage 4 and dealing with lung infections https://connect.mayoclinic.org/discussion/immune-system/
- Help finding a positive attitude https://connect.mayoclinic.org/discussion/help-finding-a-positive-attitude/

Phew, not 23 boys, but still lots of boys and grandkids. 🙂

I'll have to figure out better how to navigate the site, but thank you Colleen for the link to Metastatic BC. I didn't see any 2019 posts and wonder if there is a link to more recent discussions. Also, No, I don't have 23 boys. I am a mom "to" 3 boys, 29, 22 and 16 and 3 grandkids ages 12, 9 and 7.

Welcome new members @mom23boys and @vivianvance
@mom23boys You may also be interested in this discussion where members are talking about stage 4 breast cancer, some of who are taking Ibrance
- Metastatic breast cancer: Anyone else? https://connect.mayoclinic.org/discussion/metastatic-breast-cancer-to-the-bone/
Do you really have 23 boys?

Vivian, what type of breast cancer were you diagnosed with and what treatments have you had?

@vivianvance, had you been on any other drug before Letrozole? Please keep us posted about side effects.

Started Letrozole yesterday

francine, This is my first time out here on this site having just been diagnosed with IDC stage 4 in April of this year. I started Ibrance/Letrizole last month and have had no side effects from either, no nausea, nothing. I feel very fortunate. Just wonder if it might kick in as treatment progresses.