Overdose is more common in young children<unk>  overdoses in adults are rare and typically require ingestion in excess of 5 g
Toxic levels are considered to be  150-200mg/kg
^Average<unk>  content can vary
Caffeine toxicity
Cocaine
Nicotine toxicity
Amphetamines
Clenbuterol toxicity
Synthetic cathinones 
Ipecac toxicity
Ketamine