The bark contains hydrocyanic acid, which is in many modern cold and cough medicines.
From the sacbee.com
Raw apricot kernels contain amygdalin, which releases naturally occurring hydrocyanic acid.
From the smh.com.au
Hydrocyanic acid is a very weak acid, and accordingly its salts dissolve easily in stronger acids.
From the scienceblogs.com
Cyanides, the salts of hydrocyanic acid, inhibit cellular respiration and may lead to coma or death.
From the sciencedaily.com
But they need to be blanched three times in fresh boiling salted water to destroy the hydrocyanic acid bamboo contains.
From the au.news.yahoo.com
Kernels contain between 2.05% and 2.40% hydrocyanic acid, but normal consumption is insufficient to produce serious effects.
From the en.wikipedia.org
Basically this is a thought experiment in which we place a living cat in a steel chamber with device containing a vial of hydrocyanic acid.
From the scienceblogs.com
On the downside, it's low in protein, and some varieties contain hydrocyanic acid in doses than can prove harmful if the root is not treated properly before consumption.