<s>[INST] My 3 yr old has just drank a small amount of piriton from the bottle i do not know how much, but i know there was not much in the bottle, there was less then a 1/4 bottle but i wondered how much is a dangerous amount and should i take him to the hospital, [/INST] HiWelcome to the HCMPiriton syrup has Chlorpheniramine drug. In my opinion you should immediately go to ER as you are not sure about the exact amount taken by the child.Chlorpheniramine is a sedative drug and may lead to many side effects at high doses which needs careful monitoring and management accordingly.The estimated lethal dose of chlorphenamine is 25 to 50mg/kg body weight. Symptoms and signs include sedation, paradoxical excitation of the CNS, toxic psychosis, convulsions, apnoea, anticholinergic effects, dystonic reactions and cardiovascular collapse including arrhythmias.Symptomatic and supportive measures should be provided with special attention to cardiac, respiratory, renal and hepatic functions and fluid and electrolyte balance. For further questions, you may contact me.Take care </s>