Hyoscyamus niger (scopolamine/Hyoscine)

Causes dry mouth, thirst, difficulty in swallowing and speaking, warm flushed skin, dilated pupils, blurred vision and photophobia, vomiting, urinary retention, tachycardia, pyrexia, drowsiness, slurred speech, hyperreflexia, auditory, visual or tactile hallucinations, confusion and disorientation, delirium, agitation and combative behaviour. In severe cases there may be hypertension, coma and convulsions.

The smell of the flowers can cause giddiness.