Checking med toxicity and dosage

[Savethemall]

Hi, iv got a med from my vet that called Vermis -ex. it supposed to be a de wormer for dogs. The ingrdients areraziquintel 50 MG Fenbendazole 500 MG Sodium lauryl sulphate, Polyvidone25, Croscarmellose sodium and Magnesium stearate.
Does anyone has ideas how can i make sure its not toxic and how to dose it? its for a fish with signs for internal parasites.

 

[Mitchellhowell]

Not sure about other meds, but I used paraguard as recommended a few weeks back, it says to add in the recommended dosage every 24 hours, and that it didn’t need to be removed after the 24 hours. My flowerhorn overdosed on it and had seizure like movements. Water changes are always good when medicating. Even when it doesn’t say it needs to be taken out it’s still best to. The overdose my flowerhorn has was pretty bad. I’m 90% sure he was within a day of dying I’d my LFS didn’t tell me why it was happening. I was clueless about what was going on.