Tamoxifen Is The Devil: Read Why!

Great news! If you’re the one in eight women diagnosed with breast cancer, and your particular cancer is hormone positive, ‘all you need’ is surgery, maybe a little radiation, and the magical drug tamoxifen. I say this in jest… read on.
Tamoxifen is a drug that blocks estrogen receptors on breast cancer cells, and a large number of people diagnosed with breast cancer are estrogen positive (meaning cancer cells snack on these hormones to grow and exist). My breast cancer was hormone positive and apparently this is the ‘good’ kind.  The reason being, doctors know what feeds my particular flavor of cancer and therefore they know how to treat it and what to typically expect.
tamoxifen side effectsThis daily tablet is given to hormone positive breast cancer patients, for five to ten years after treatment, to lower the risk of the cancer recurring.  Tamoxifen isn’t technically called chemotherapy, because it’s an anti-hormone agent that blocks the effect of estrogen and stops the cancer from ‘sticking’, while chemotherapy attacks cancer cells (and every other living cell it reaches). The thought is chemotherapy will kill the bad cells before it kills enough of the good cells that will kill YOU.  You see, the estrogen blocker is meant to stop estrogen in my system, and basically throw me into pre-menopause.
My doctor warned me about side effects of tamoxifen: cervical cancer, blood clots, hot flashes, headaches, weight gain, mood swings, nausea, fatigue, depression… the list is endless.  Lovely right?  What she didn’t say was these side effects would change how I look, sleep, think, act and feel.
I’ve been taking this drug for two years and the doctors want me to stay on it for another 3 to 8 years!  Soooo in the spirit of doing whatever I can to see my boys graduate high school, I get to take a drug that makes me bat-shit crazy 50% of the time.  Read why tamoxifen is the devil…
tamoxifen and menopause jokes

Tamoxifen makes your joints ache

Each morning I get up and sort of hobble around for the first hour in unbearable pain.  I have a sharp pain in the crease where my ankle meets my foot.  It’s so weird.  I ache all over and my bones ache.  It sort of feels like those growing pains from when you were a kid except I don’t grow out of them.  I get to endure them until I stop taking this wonder drug.
tamoxifen makes you angry

Tamoxifen messes up your sleep

I don’t remember the last time I slept a full night without medicinal help.  I hate to take more medication to counteract the side effect of a medication, but sometimes I am simply exhausted and need to sleep.  Without a sleep aid, if I do sleep it’s in hourly intervals.  I typically wake up twice per night soaking wet from my hot flashes  (we’ll get to that later) and then toss and turn trying to fall back asleep.  My eyes are dead tired, my body is dead tired, yet I cannot fall asleep.  When I finally do fall asleep, it’s usually an hour or so before I need to wake up and do the morning joint pain hobble to get the boys ready for school.
tamoxifen side effects of breast cancer

Tamoxifen rage is real (just ask my poor family)

Taking Tamoxifen is like going through menopause x 100.  Tamoxifen stops my body from producing hormones (which remember feed my cancer), and when my body is free of these hormones consequently I am in a complete pre-menopausal state.  Except when females typically go through menopause, they are given hormone therapy to counteract this radical change to your hormone levels to provide some sort of stability to your body…. however I can’t take any sort of hormone replacement therapy in case it feeds my f-ing cancer and it decides to take a tour of my body again. Tamoxifen rage sends me from zero to bat-shit crazy in an instant. It’s sort of like massive mood swings sprinkled with fits of rage.  In fact I’m feeling ragey (is that even a word) just writing this and remembering how f-ing unfair this shit is. My poor family have taken the brunt of this, and the sad part is I know when I’m in my ‘Tamoxifen Rage’ yet I can’t control myself.  The drug is controlling me.  Sometimes I can barely stand myself.  It’s ugly.

tamoxifen is terribleHot Flashes

The hot flashes seem to come at the most inopportune times. They are not really flashes of heat… that’s such a myth… in fact I don’t feel hot, instead, the only way I know I’m having one is when I feel droplets of sweat roll from my neck slowly in between my plastic chest area, and around my hairline.  One minute I’m freezing cold, and the next I’m sort of bright red and sweating profusely.   It looks super attractive when you are in Trader Joe’s checking out with the perky cashier, or some other public place.  I typically get 2-3 hot flashes per night and wake up drenched and need to get up and grab a towel to wipe off.  Which again starts the cycle of sleeplessness.

Tamoxifen gives you ‘chemo-brain’

Maybe you’ve heard of chemo brain and lucky me, tamoxifen simulates this.  Low estrogen levels tamper with specific cells in your brain. These changes feel like my brain is sitting in a cloud of fog.  I am often forgetful and there are intense changes in my ability to focus, remember information, or just keep track of everyday tasks. I often ask my kids the same question over and over, which is frustrating for all, and after two years of this, they now patiently repeat themselves as many times as needed (for fear of sending me into a tamoxifen rage I think!)

Tamoxifen Tummy

Another upsetting side effect I’ve experienced while taking Tamoxifen is weight gain. Tamoxifen is designed to shut down hormones similar to menopause in my body.  Since these hormones are not around to regulate my metabolism, it’s at a grinding halt. This makes it harder to keep weight off.  Super cool.
tamoxifen mood swings

Tamoxifen makes you blurt things you should probably keep to yourself

One of the worst parts of Tamoxifen is I seem to have lost that ‘filter’ we typically use on a daily basis.   I’ve turned into that crotchety old grandma who says whatever she pleases without thinking how anybody else is going to take it. My thoughts sometimes blurt out of my mouth, without any restraint.  The worst part is I know it’s happening, but again am unable to stop it since I’m being controlled by my ‘wonder drug.’  It’s like I’m possessed by the Tamoxifen.

Tamoxifen causes blood clots and other cancers.

The drug also raises the risk of blood clots and endometrial cancer.  Which means all my other doctors keep a close eye on me for risk of developing cancers.  Which is good and bad.  Each time I go to my OBGYN I’m given a biopsy of my uterus, and if you’ve ever had one of those, you know it’s along the pain scale of a root canal without anesthesia.  Except in your lady parts.
why tamoxifen sucks and is a horrible drugSo there you have it.  I can’t shut up, regulate my body temperature, lose weight or sleep. And I hurt all over.  My family is probably going to disown me due to tamoxifen rages, in which case the hot flashes at night won’t be a problem.  My option is to take this wonder drug to stop my cancer from recurring (that also changes my life) or live with a high risk of recurrence of breast cancer.
Thank you breast cancer… the gift that keeps on giving.  Thank you Tamoxifen, you freaking ‘wonder drug’…. I feel so lucky we get to hang out for the next 3 – 8 years, where I’m told your delightful side effects continue to get more intense.  I will survive the time we have together, because I don’t really have another option and you don’t scare me, but I can’t guarantee I won’t complain about you in one of my rages and throw you at the wall!
Do you take or know someone who takes tamoxifen and can you relate?

About The Author


I’m a travel and health writer, digital and brand consultant, breast cancer survivor, and supermom to two active boys! I keep it real and share stories of raising feral wolves teenage boys, family life after a cancer diagnosis, and family travels around the world! Each story is shared with my dry, and sometimes naughty sense of humor.


  1. Barb Tressel-Bangas | 6th Jun 18

    AMEN! Thank you for the article! I’ve been on tamoxifen since 2013. I’m sorry you’re going through it too … however, it’s a relief to know I’m not the only one. Best to you & your family!

    • Samantha | 6th Jun 18

      Urgh… sorry you are going through this too… the doctors don’t share the nitty gritty do they?!?! Sending health and love to your family!

  2. Maria | 2nd Jul 18

    Thanks! I thought I was going crazy. Sending hugs and love to all those who are going through this wonderful(sarcastic as hell) journey!

    • Samantha | 2nd Jul 18

      Nope not crazy.. it’s just the wonder-drug making us crazy! Lucky us! xx

  3. Amy | 12th Aug 18

    I lost my family over this devil drug tamoxifen. I took it for eight years, as my mother inlaw die of secondary breast cancer, hence husband encouraged the drug and yet unable to accept my “tamoxifen rages”. So my family abandon me when I suffered from severe mental health. Life goes on, I stopped taking the drug after my crisis which prompted me to re-evaluate what’s wrong with me. But it WAS NOT ME, the drug took control of my Brain. Enough is enough! I am now medically decease free, ie cancer free – not sure the sever side effects was worth it. But I am now me, I have control over my emotions and behaviour. Was so shocked by the chemical effect it had in my brain. Think and evaluate what’s best for you. The side effects are real…;(

    • Samantha | 14th Aug 18

      Oh Amy. I’m so sorry to hear of your battle with this drug. The side effects are different for everyone, but for me, and it sounds like for you too, they are very real and not fun at all! Stay healthy!

  4. Amy | 11th Nov 18

    Thank you for writing this. I am really struggling in life right now. I feel extremely moody and sad, and I lash out and get mad at people very quickly. I have spent the last few months wondering what is wrong with me. You know what’s wrong with me? NOTHING. ITS NOT ME. Its just Ive been on awful Tamoxifen for 5 1/2 years now, and I think this is a side effect that is getting worse and worse. I dont know what to do. I got diagnosed at 31 and my onc is dead set on keeping me on Satan pill for 10 years. I just dont know if I can stay on it. I truly hate being an asshole.

    Thank you for letting me vent. I really appreciate you writing this article and sharing your thoughts.

    • Samantha | 12th Nov 18

      Oh Amy… I hear you loud and clear. In fact I asked my oncologist if I could come off of it, and she said the alternative is just too risky for me for recurrence. The worst part is that people expect you to be ‘over’ the cancer thing, and they have no idea the lingering effects and challenges. Hang in there. I feel your pain! XXXX

  5. | 12th Dec 18

    I recently was suspended from work may not have a job there after this latest massive mood swing

    • Samantha | 13th Dec 18

      Oh no… so sorry to hear this… Sending you love and well wishes.

  6. | 30th Jan 19

    Omg!!! I’ve only been on tamoxifen for 6 days and I’m losing my effing mind. I resisted at first but 5 months after surgery 3 more breast cancer tumors popped up. I feel the effects within about 20 min after taking it and I am shocked at how powerful it is. I am about to quit already and go back to taking DIM and double up my dose.

    Thank you for sharing because I just didn’t want to believe I could feel this crazy.

    I’m going to go all in with cannabis and fasting and natural treatments because life ain’t worth living like this.


    • Samantha | 7th Feb 19

      urgh, I am so sorry that you also are going through this…. it really is the devil! Sending love and healthy hugs your way! XX

  7. | 8th Mar 19

    The only thing I think will help research and resolve the side effects is if everyone who prescribed it had to take it themselves. My suspicion is that this medication ruins 50% of the relationships it touches.

    • Samantha | 9th Mar 19

      Agree… the side effects are devastating and pretty hard to live with, and unless you take this drug you have no idea how severe they are. Hang in there!

  8. | 12th Mar 19

    I HATE Tamoxifen! It is a nasty drug I wish I could flush down the toilet and forget! I can’t stand feeling stupid, achy, fat, lethargic, …… Oncologists should really have to take it for a few months. I guess, actually, pharmaceutical reps should have to do the stop pushing it!

    • Samantha | 13th Mar 19

      It really is the devil… I wish there were another option! Stay strong!

  9. | 10th Apr 19

    Thank you for helping me get through another lovely, tamoxifen-filled day. It truly helps not to be alone. XO

    • Samantha | 11th Apr 19

      Happy to help! 🙂 . so sorry you too are taking this crazy making drug!

  10. amanda.kean@btinternet.com | 13th Apr 19

    So relatable, I’ve been on tamoxifen since December and I hate it with a vengeance…. Horrendous joint pain which stops me sleeping, hot flushes, fatigue and has made my depression and anxiety return ….. So tempted to stop taking it but fearful of reoccurrence …… And sick of people telling me how well im looking ….. Appearances are deceptive …. I may look fine and have a smile on my face but most of the time I feel like crap …. Hate tamoxifen and hate cancer. ! Xxx

    • Samantha | 13th Apr 19

      I wish there was more discussion around tamoxifen and the horrible side effects… i feel that so many people are suffering in silence… so sorry you are going through this too…

  11. Vivien | 20th Apr 19

    Thank you for sharing! Tamoxifen rage is making me hate myself. I tried so hard to control my tamper but I still go crazy! It seems like it is getting worst as time goes on. I feel bad for my kids. I totally agree with you about you know you are on tamoxifen rage but can’t control it. I know I had said hurtful things 😭 I wish there is other choice. I hope my kids still think that I love them even mommy get bat-shit crazy 10 times a day.

  12. Trisha | 21st May 19

    Yeah it’s a real thing…and they should do more studies on it and how it affects us emotionally …being sad…mad, irritated and not feeling yourself …knowing this isn’t who you are or want to be and having little control over it .

    • Samantha | 23rd May 19

      Not to mention the weight gain… i would love to have more studies on this ‘miracle drug’….

Leave A Comment

Your email address will not be published. Required fields are marked *