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How long does dog seizure Diazepam last in plastic syringes?

Updated on September 23rd, 2025

Pet's info: Dog | Chihuahua | Female | spayed | 12 years and 3 months old | 9.2 lbs

A new vet gave me two plastic syringes of Diazepam for my 12 year old Chihuahua to use rectally after a seizure to help prevent a second one. I'm under the impression, after researching, that Diazapam does not remain stable for more than approximantely two hours when stored in plastic. I questioned the vet today and was told he never heard of this, only that the Diazapam should be kept from light. I wish to know about the storage of Diazapam in plastic syringes.

1 Answer

Most Helpful Answer

Linda G,  MS, DVM

Answered By Linda G, MS, DVM

Veterinarian

Published on September 19th, 2017

Hello, thank you for using Petco Pet Education Center, formerly Petcoach. I have never heard this either. Perhaps there is some concern about administering the diazepam intravenously after storage in a syringe, but to administer rectally is of no concern at all. I routinely send home syringes of diazepam for this specific purpose, & often the owner does not need to use them for months. I do request any not used in 12 months be returned & replaced, but otherwise have had no problems with potency. The medication will work as expected.
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