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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

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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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