Nervous about switching from Letrazole to Exemestane

Posted by blair01 @blair01, Jul 3, 2025

Hi - I have been on Letrazole for 2 years (invasive ductal carcinoma, node positive, did chemo and radiation, double mastectomy and oophorectomy...was diagnosed right after my 46th bday). Recently I've had neuropathy for the first time (it moves around/switches which limbs it affects...strangest thing). Ruled out metastasis with spine and brain MRI plus chest CT and bone scan (insurance wouldn't cover PET). Anyway, my oncologist said to try a "drug holiday" to see if the letrazole could be causing it. The numbness is noticeably better after a week off the letrazole (but not gone). He suggested I could switch to Exemestane to see if it solves the problem but I am nervous to make the change -- sort of feels like the devil you know is better than the devil you don't? My question is -- has anyone had a bad experience with Exemestane (beyond the obvious hot flashes/joint pain as I'm used to those?). I'm specifically nervous about the "mild androgenic effects" that it can have. I have lost my breasts and just finally grew my hair back out -- I don't want anything to make me feel any less feminine than I already do at times. Thanks for anything you can share!

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Profile picture for penny21 @penny21

Hello, again! Thanks for your reply! What did you do about your trigger finger? Did it get better once you were off Letrozole? Did you have cortisone shots or surgery? Interested to hear. 😊

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Hi again! It is in my left middle finger, and my oncologist said at this time he didn't recommend that I do anything. I thought that was puzzling, but went along with it. I see him again next month for follow-up.
The trigger finger has remained consistent throughout the break I took from letrozole and now with being on the exemestane again. Ironically, my husband had trigger finger during this time as well! Haha, I told him it must be sympathy pain. His GP sent him to an orthopedic doctor who gave him a steroid injection which worked immediately to alleviate his symptoms! If mine persists, I'll try to go to the same ortho and ask for an injection. Take care!

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Profile picture for penny21 @penny21

Hi MistyMar,
I feel your pain. I feel trapped by being told I must take this or one of the aromatase inhibitors (pick your poison) the rest of my life. All the side effects you mentioned, not to mention osteoporosis and linked to cardiac issues, as well. “Yes, we can delay your death from cancer, but you will feel lousy, be tired all the time and have painful side effects, but we can give you more drugs for what ails you. The cancer might not kill you yet, but the massive amounts of drugs and their side effects might. Depressing.

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I fully agree. I’ve always said I’m not doing the “circular medicine” - take this medication, now take this one to stop the side effects of the other one, now take this medication……. Everything here is rock vs hard place. No, you don’t have to do chemo but if you have mets in 2 years, too late to say “gee, I should have done chemo”. This is the same. I really don’t want to have to go through all this again so not sure I want to stop this medication if I don’t absolutely have to BUT there is that quality of life issue. My cancer group is saying 5 years only (claims research shows no difference between taking 5 vs 10 years) so hopefully that holds but things can change as we get closer. Luckily so far, heart tests normal and last bone scan was also normal without taking any bone meds (I declined). So I stay on the meds and try to survive all this that according to them aren’t side effects of the medication. Not sure I would survive without forums like this and knowing it’s not just me.

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Profile picture for harkey @harkey

Hi, I recently took a 6 week washout period from letrozole, and then started exemestane about a week ago. The last 2 nights I awoke with excruciating Charley horse in my right quadricep. The pain and muscle swelling lingered into the daytime hours, making it difficult to even drive.
Has anyone else experienced these terrible leg cramps?
I'm terrified to go to sleep tonight!
It makes the unpleasant side effects I had while on letrozole seem mild, and I am debating going back on letrozole.
Thank you for any guidance!
Xo, Harkey

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Upon switching from Letrozole to Exemestane, my oncologist suggested taking the lowest dose every OTHER day…which has worked entirely better. I still get occasional hot flashes, but the leg cramps, bone pain, mood crazy states seem to be gone. Well…mood is always an issue, but it may come from life these days; who can tell?! Letrozole was hell for me, as was another I’ve forgotten. 4 more years of Exemestane does seem possible at this new dose pattern. Don’t hesitate to change when your symptoms interrupt your life like that!!

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Profile picture for katrii @katrii

Upon switching from Letrozole to Exemestane, my oncologist suggested taking the lowest dose every OTHER day…which has worked entirely better. I still get occasional hot flashes, but the leg cramps, bone pain, mood crazy states seem to be gone. Well…mood is always an issue, but it may come from life these days; who can tell?! Letrozole was hell for me, as was another I’ve forgotten. 4 more years of Exemestane does seem possible at this new dose pattern. Don’t hesitate to change when your symptoms interrupt your life like that!!

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I will certainly discuss the every other day thing with my doctor. I am pretty sure my original doctor at Emory had suggested that when I refused to take it (Letrozole) at all following my bilateral mastectomy and refusal to do radiation. Chemo not recommended due to oncoscore of tumors: zero and ten, back in ‘21/initial diagnosis and surgery. Thanks for the reminder!

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Profile picture for mistymar @mistymar

I fully agree. I’ve always said I’m not doing the “circular medicine” - take this medication, now take this one to stop the side effects of the other one, now take this medication……. Everything here is rock vs hard place. No, you don’t have to do chemo but if you have mets in 2 years, too late to say “gee, I should have done chemo”. This is the same. I really don’t want to have to go through all this again so not sure I want to stop this medication if I don’t absolutely have to BUT there is that quality of life issue. My cancer group is saying 5 years only (claims research shows no difference between taking 5 vs 10 years) so hopefully that holds but things can change as we get closer. Luckily so far, heart tests normal and last bone scan was also normal without taking any bone meds (I declined). So I stay on the meds and try to survive all this that according to them aren’t side effects of the medication. Not sure I would survive without forums like this and knowing it’s not just me.

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I took bone med infusion (Zometa) once in April and really don’t want to take it again. Had sever bone pain for several days in my right arm and hand and all the way to my shoulder.

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Profile picture for mistymar @mistymar

Initially started on Anastrazole. After about 8 months, the muscle and joint pain and leg cramps were taking its toll - not debilitating but constant, just moved around (today the left ankle tomorrow right hip and thigh). Electrolytes helped with the cramps. Oncologist took me off meds for a month and then started exemestane. Did fine till started 3rd month - then weight gain (10# in 1 week with no dietary or exercise changes), then fatigue set in. Initially not bad - might nod off after lunch or would have to take a nap a couple times a week. At visit 5 months in, he mentioned I “looked tired” and I told him I was - all the time. Asked if I was depressed (don’t really think so). 2 months later, he ran extra tests for fatigue and all was normal but this had progressed almost to an inability to function mid day, multiple “naps” (in quotes because don’t usually go to sleep, just lay there and try to relax - it’s more of a whole body fatigue if that makes sense). Now from 8 - 10 months in, I can’t sleep - lucky to get 3-4 hours a night which makes the fatigue even worse. I do have some muscle cramps but not excessive or severe. Having trouble getting exercise both because now have to talk myself into it and because I get tired and winded halfway through. So I think my side effects are - hot flashes/sweating, extreme fatigue, insomnia, hair loss and weight gain. I think it’s the exemestane but a) none of them do. They just keep pushing anti depressants and b) only thing left is letrazole and it may be worse. Or try Anastrazole again and live on pain meds but maybe without the other side effects.
Like several others here, I’ll continue because don’t feel I’m comfortable with stopping the meds and hope I survive the next 3 1/2 years.

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So sorry that you are going through this. I am also taking a month off before starting exemestane. I have been on anastrozole for 1 year and 7 months. Joint pain was continuing and oncologist did not want it to affect my right hand more and my ability to exercise. However, what you are describing is worse. Have you consider anastrozole brand name? I read that some feel much less side effects from the name brand (Arimidex). I am thinking I may asked to do that if exemestane does not work for me...

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Profile picture for harkey @harkey

Hi, I recently took a 6 week washout period from letrozole, and then started exemestane about a week ago. The last 2 nights I awoke with excruciating Charley horse in my right quadricep. The pain and muscle swelling lingered into the daytime hours, making it difficult to even drive.
Has anyone else experienced these terrible leg cramps?
I'm terrified to go to sleep tonight!
It makes the unpleasant side effects I had while on letrozole seem mild, and I am debating going back on letrozole.
Thank you for any guidance!
Xo, Harkey

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I’m on letrozole and have a trigger finger ( which is bearable) but I’m likely going to get it sorted with a steroid injection
I’ve had horrendous leg cramps in bed , quite often if I stretch my foot out
I saw a physical therapist who said I had spasm of my calf muscles and showed me how to do stretching exercises which really help
My pain isnt persistent so I know it’s to do with muscles and tendons so if you are sure your pain isn’t sinister ( leg cramps aren’t usually) might be worth doing some stretching exercises

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Profile picture for llthomson @llthomson

So sorry that you are going through this. I am also taking a month off before starting exemestane. I have been on anastrozole for 1 year and 7 months. Joint pain was continuing and oncologist did not want it to affect my right hand more and my ability to exercise. However, what you are describing is worse. Have you consider anastrozole brand name? I read that some feel much less side effects from the name brand (Arimidex). I am thinking I may asked to do that if exemestane does not work for me...

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Cost is sometimes a factor as well. I had read about some people using only brand name and not generics and doing well so I looked into it. Not covered by my insurance so I would pay out of pocket. Cost for brand name arimidex is 3-400.00/month and for aromasin is over 1300.00/month. So generic it is. I can handle the 70.00. I have read about the every other day dosing and may consider that. The half life is 24 hours. So every day means you are staying pretty much at full dose (take the next pill when 1/2 of first one is gone), every other day means you are kind of pyramiding it (take the next dose when the first one is completely gone. So zero start, to 1/2 dose at 24 hours, back to zero at 48 hours then next pill). Will do more research but definitely in my question list for next visit.
I just want to say I appreciate the responses. Just to know we’re not in this alone and NOT CRAZY. Friends and family either don’t want to talk about this or feel like since primary treatment is done, you should be back to feeling normal. They don’t understand that I still have side effects from the chemo and radiation even at 18mo (and maybe for years). The doctors often either don’t admit or don’t understand that what we are feeling now may be due to this medication even if it’s not a typical side effect. So thank you for everyone on this site for your help and input. Hopefully I am contributing helpful information as well.

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Profile picture for ohareip @ohareip

I’m on letrozole and have a trigger finger ( which is bearable) but I’m likely going to get it sorted with a steroid injection
I’ve had horrendous leg cramps in bed , quite often if I stretch my foot out
I saw a physical therapist who said I had spasm of my calf muscles and showed me how to do stretching exercises which really help
My pain isnt persistent so I know it’s to do with muscles and tendons so if you are sure your pain isn’t sinister ( leg cramps aren’t usually) might be worth doing some stretching exercises

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Thank you so much, I will try that!

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Profile picture for mistymar @mistymar

I just turned 73. Have read that a lot of women that are older are choosing not to take these meds. But tumor markers have never gone to normal so I’m not comfortable stopping. Figure I got through surgery, chemo and radiation and can’t stop now.

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Hi MistyMar, I am taking some other “non conventional” things, such as Pectasol, a modified fruit pectin that has had a number of studies done on it. Also take powdered Cordiceps mushroom daily.
Hard to prove what has had the most effect but my doctor claims the Letrozole. Maybe not just the Letrozole…my blood cancer markers have decreased though. One was in the normal range, one has continued to get lower, but not normal. I understand your hesitation about stopping the medication! It is all pretty scary. Thanks for your reply.

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