Side efeects of Herceptin.

Hi Ladies,

Looking for advice again.
I’ve just had herceptin number 5.
Afetr the first and all subsequent doses i have had diarrhea, and it seems to be getting worse. It lasted for over a week last time. I was just wondering if anyone else has had this and what they did about it, or what they took.

Thankyou Debs x

Yep, had 8 doses of herceptin, Had diarrhoea after each one for about a week. I just battle through it, I don’t take anything particularly for it. I think my body has been through enough drugs already. It turns into constipation by the beginning of week 2, for which I take Fybogel.

Hi Debs,

I have just finished 18 doses of Herceptin. I had diarrhoea every time. Soon learned to control it by taking 1 Loperamide capsule on the evening of the infusion and 1 morning and evening on the next 2 days. After that I was fine.

Hope this helps.


I’m on number 12 and rely on Immodium Instants and lots of water in the week after.

Jan xx

Thank you for sharing your experiences.

I was advised by healthcare at home nurse to take imodium, which i’ve done and although things aren’t so loose i’m still a quite diarrhea-ish and still getting the cramps and still about 6 times a day. It use to only affect me for about four days and this bout has been going on for nearly two weeks now, i had another infusion tuesday, so don’t expect it to end anytime soon.

You’d think with moderen medical miricles like cloning organs they’d be able to make drugs with out side effects now. Wishful thinking i know.
Thanks again. xx