Final answer:
The FDA banned OTC sedatives, including Quiet World and Compoz, that contained scopolamine combined with methapyrilene. Scopolamine is a substance derived from the Atropa genus used to treat motion sickness.
Step-by-step explanation:
Sedatives such as Quiet World and Compoz, which were banned by the FDA, contained small amounts of the acetylcholine receptor blocker scopolamine combined with the methapyrilene. Scopolamine is a substance used to treat motion sickness and is derived from the Atropa genus. The transdermal scopolamine patch is a popular treatment for motion sickness, where the drug is released in controlled amounts to avoid potential dangers. For those concerned about using scopolamine, antihistamines like dimenhydrinate can be used as an alternative.