Laudanum is a form of medicine made from a tincture of opium. Its creation can be credited to Paracelsus, one of Frankenstein’s inspirers. Laudanum has the ability to relieve pain, insomnia, and diarrhea. Frankenstein uses it to put himself to sleep after the death of his friend Clerval.
Harding, Stephen, Lee Ann Olivier, and Olivera Jokic. "Victorians and Laudanum." Victorians' Secret. 2000. 23 Aug. 2008