Does freezing worm medicine ruin it? - The Horse Forum
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post #1 of 3 Old 04-30-2008, 02:04 PM Thread Starter
Join Date: Apr 2008
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Does freezing worm medicine ruin it?

I bought a year's supply of rotational worm meds for my horses and like an idiot and let them freeze, unfreeze, freeze. Ivermectin, pyrantel pamoate, prasiquantel. Are they now ineffective? I've heard different answers. Any help would be appreciated. I sure as heck hate to throw away $250 but if they're no good, I'll have to.
cissysmom is offline  
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post #2 of 3 Old 04-30-2008, 05:33 PM
Join Date: Jul 2007
Location: East Texas
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Yes, dewormers need to be stored at room temperature (around 75 degrees F) extended time at temps below 60 degrees and above 85 degrees will ruin the products.

Cindy D.
Licensed Veterinary Technician
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post #3 of 3 Old 04-30-2008, 07:22 PM Thread Starter
Join Date: Apr 2008
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Thanks for your quick and definitive response--it's exactly what I needed. I've learned my lesson! (As with so many things about horses, I learned it the hard way.)
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