Deadly Nightshade: In toxic or deadly doses, the symptoms of poisoning with deadly nightshade are, rapid pulse, thirst, dry mouth, difficulty in swallowing, restlessness and fatigue, headache, dry hot skin, iris almost obliterated, near vision very blurred, hallucinations, convulsions, and coma.
Wolfsbane: The symptoms of poisoning with wolfsbane include chest pain, extreme anxiety, irregular heart beat, loss of speech control, nausea, pinpoint pupils, throat hands and mouth numb, vomiting, death due to respiratory arrest.
Hemlock: Symptoms of poisoning with poison hemlock include nervousness trembling, incoordination, dilated pupils, weak heartbeat, cold extremities, coma and death caused by respiratory failure.
Arsenic: Death from acute arsenic poisoning is usually caused by irreversible circulatory insufficiency, but if the dose is not large enough to kill the patient a number of secondary effects can be seen 2-4 weeks after ingestion of the poison. These include hair loss, skin changes (as in chronic poisoning) and possible chronic renal failure.
Cyanide: The signs and symptoms vary with dose and rate of exposure. Anxiety, excitement, rapid breathing, faintness, flushing, headache, nausea, drowsiness and coma may be seen. In homicidal poisoning the dose and rate of exposure mean that many of these symptoms are not seen due to the rapid onset of coma and death which can be in as little as 30 seconds.
Strychnine: This leads to powerful and extremely painful convulsions, there being no impairment of cognitive or sensory function. Death occurs as a result of respiratory arrest, due to spasm and paralysis of the respiratory muscles.
Iocane powder: It is odorless, tasteless, dissolves instantly in liquid, and is among the more deadly poisons known to man.