If you're an athlete or bodybuilder, you've likely heard of clenbuterol. Fitness enthusiasts commonly use clenbuterol as a supplement for weight loss. However, using clenbuterol for weight loss or muscle gain without a prescription is illegal. Outside of the United States, you may visit a doctor to get a prescription for clenbuterol to treat asthma. Avoid using the drug for weight loss without a doctor's prescription—it is both illegal and dangerous.
Steps
What are the effects of clenbuterol?

In the United States, clenbuterol is used to treat respiratory obstruction in horses. Clenbuterol is not approved for human use in the U.S. The drug is only used for horses, and occasionally cattle, to treat infections and asthma.
Outside of the United States, clenbuterol can be used to treat asthma. The drug is typically available in liquid or tablet form. A doctor's prescription is required to purchase it, and you must stop taking the medication once you have recovered.
How does clenbuterol work?

The drug works by opening the airways in the lungs. This is why it is used to treat asthma and chronic obstructive pulmonary disease in both humans and livestock. Its fat-burning effects are merely a side effect, and the medication is not intended for weight loss or muscle gain.
Do you need a prescription to buy clenbuterol?

Yes, you need a prescription from a doctor. Some people in the fitness community illegally buy clenbuterol from unverified sources, which is risky because you don't know what it contains. Never buy clenbuterol online or from overseas.
Can athletes use clenbuterol?

No, clenbuterol is banned by the World Anti-Doping Agency (WADA). This means that if you are caught using clenbuterol in a doping test, you will be disqualified from your sport. Clenbuterol is classified as a performance-enhancing drug, similar to steroids.
What is the recommended daily dosage of clenbuterol?

Take as prescribed by a doctor for the treatment of pneumonia. There is no standard dosage for clenbuterol, and taking too much can lead to serious side effects. You are at risk of overdosing if you take the drug unsupervised, so it is important to get a prescription before use.
- The typical dosage for humans is 0.02 – 0.03 mg/day.
What are the side effects of clenbuterol?

There have been reports of muscle spasms and tremors, especially when taken in excessive amounts. You may also experience hyperactive reflexes and increased anxiety levels.
Is there a risk of overdosing on clenbuterol?

Yes, an overdose of clenbuterol is very dangerous. Taking more than the prescribed dosage can lead to chest pain, palpitations, increased heart rate, vomiting, or even a heart attack. If you accidentally overdose on clenbuterol, seek emergency medical attention immediately.
Warning
- Note that medications containing clenbuterol are not approved by the U.S. Food and Drug Administration (FDA).
