1. A synthetic drug that acts as a bronchodilator and decongestant, used medically to treat asthma and respiratory conditions in some countries.
Usage: pharmaceutical; not approved by the FDA for human use in the United States; approved in some other countries for treating asthma and COPD
2. A substance sometimes misused as a performance-enhancing drug or weight-loss agent due to its effects on metabolism and muscle development.
Usage: banned in sports; illegal use; veterinary use in livestock is also controversial

Examples

• Clenbuterol is prescribed in some countries to help patients with asthma breathe more easily.
• The athlete tested positive for clenbuterol and was suspended from competition.
• Clenbuterol is not approved by the FDA for human consumption in the United States.
• Some bodybuilders illegally use clenbuterol to increase muscle mass and reduce body fat.
• The veterinary use of clenbuterol in livestock has raised food safety concerns in several nations.