Two psychiatric presentations linked with ‘head shop’ products.

We report two cases of acute onset and rapid resolution of psychotic symptoms, the first following oral ingestion and the second following intravenous injection of some head shop products (HSPs). Both were associated with autonomic instability and negative results on urine toxicology screening using standard techniques. They highlight the potential dangers of managing such cases in acute stand-alone psychiatric units. Recent advance in characterising some HSPs by toxicology screening is also discussed