What were the poisons in wine arsenic and Old Lace?

The play "Arsenic and Old Lace" does not involve arsenic as a poison. The titular poison is actually arsenic trioxide, a common poison in the early 20th century.

While the play is a comedy of errors, it is important to note that arsenic poisoning is a serious matter. If you suspect someone has been poisoned, it is essential to contact emergency services immediately.