Final answer:
The marketing of OTC ephedrine for appetite suppression is prohibited, owing to its significant side effects and potential for chemical dependency and misuse.
Step-by-step explanation:
The marketing of OTC ephedrine for the indication of appetite suppression is prohibited. Ephedrine is a compound that has been traditionally used to treat conditions such as asthma, hay fever, and congestion due to its ability to decrease nasal and bronchial congestion. Not only does ephedrine decrease appetite, it also increases blood pressure and heart rate, which can lead to sleeping problems and affect mental health, causing issues like hallucinations, anxiety, and chemical dependence. Due to its structure, ephedrine can be used to synthesize methamphetamines, which have contributed to restrictions on its sale and use in medications.