Side effects of taking Bravecto

I had purchased the Bravecto tick and flea drops on the 30/09/2019 and a day after giving the drops to my 9month old Lab/Rotti Mix he had displayed signs of lathagic and refused to eat. I then researched the product and found horrific stories pertaining to this drug. I immediately started my puppy on activated charcoal and gave him Milkthisil to aid in the poisonous reaction he had to this drops within 5 days he started to eat slowly and his energy levels is rising. Please take caution when purchasing drugs for your pets do your research and safe yourself the stress and vet bill or even the loss of a pet.