Antidotes and Specific TherapiesDownloads

In case of cyanide poisoning, antidote of amyl nitrite is given. This is an example of:

A 3 yrs old child is brought to the emergency room by his parents after they found him having a generalized seizure at home. The child's breath smells of garlic, and he has bloody diarrhea, vomiting, and muscle twitching. Which poison is it likely that this child has encountered?