Final answer:
The Green Whistle, also known as Penthrox, is approved by the FDA for medical use.
Step-by-step explanation:
The Green Whistle, also known as Penthrox, is approved by the FDA for medical use. It is a hand-held inhaler that contains methoxyflurane, a volatile anesthetic agent. It is typically used for short-term pain relief, such as in emergency medical situations or during minor surgical procedures in healthcare settings.
While it is approved by the FDA, its use is subject to certain restrictions and regulations. For instance, it can only be administered by healthcare professionals and should not be self-administered. The FDA requires proper training and qualification for professionals who administer Penthrox.