Regumate and breast cancer

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29 November 2025
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I have just taken on a loan horse who is on Regumate. She was on it when her owners bought her 4 years ago, and they just kept her on it. So we don't know if she 'needs' it. I have been having breast cancer treatment for the last year and have read about how careful I need to be handling it.

I'm wondering if I need to discuss with her owner/vet trying to reduce/come off it. What are people's experiences and opinions please? I'm more used to geldings! We are hacking, no competing, but I do want to keep her lovely, calm temperament!
 
Winter is probably the best time to stop Regumate as in theory mares do not have seasons in the winter, but with the mild weather we've been having there are mares still having them. I found my mare had a very strong season for the 2 months after I stopped Regumate so this is something to be aware of.
 
Thank you for replying. I'm talking to the vet on Wednesday so I'll discuss it with her then. It's a shame to do it so soon after getting her, as it won't be easy to recognise behaviour changes or their cause, but it really does sound quite unsafe for me to be handling this stuff. Thank you for your advice
 
I use surgical gloves to handle it, I just pour a quantity into an air tight pot and then pull 12ml out in a syringe into the feed. Not got any on my skin as yet. I am 10 years post breast cancer chemo/rads/surgery.
 
I use surgical gloves to handle it, I just pour a quantity into an air tight pot and then pull 12ml out in a syringe into the feed. Not got any on my skin as yet. I am 10 years post breast cancer chemo/rads/surgery.
I don't know how true it is but I was advised it secretes through their skin and urine, so if true it's not just handling the product that can cause the issues.
 
I don't know how true it is but I was advised it secretes through their skin and urine, so if true it's not just handling the product that can cause the issues.
I suspect there's some truth to this because wasnt an eventer disqualified after his gelding tested positive for regumate but it had been ingested when the mare in the next door temporary stable at an event had peed on some hay and the gelding had managed to get to this hay and eaten it.
 
I had a mare on this years ago. It was in an canister that you pumped one or two squirts out of it into a feed. It was the one meant for pigs but has the same ingredients without the horse tax price on it. I still used gloves as I was concerned about getting it on me, but never did.

She was able to come off it in winter - november to early march - and then I'd put her back on it again for the summer. I could probably have taken her off it all together if I didn't have her grazing near my stallion. I think it's probably the best time to trial come off and then see how spring effects her. from memory it doesn't take long to get back in the system if the trial doesn't work.
 
I suspect there's some truth to this because wasnt an eventer disqualified after his gelding tested positive for regumate but it had been ingested when the mare in the next door temporary stable at an event had peed on some hay and the gelding had managed to get to this hay and eaten it.
Crikey, if the hay falls on the floor my girl won’t eat it. I struggle to imagine any horse eating pee tainted hay.
 
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