What does clenbuterol do?

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[size=1][size=1]Clenbuterol, or “clean,” stimulates the heart and central nervous system (CNS). It has the opposite effect as a beta-blocker and a similar effect on the body as epinephrine and amphetamines.
This stimulation leads to various effects, such as:[/size][/size]

• [size=1][size=1]excitability[/size][/size]
  
• [size=1][size=1]nervousness[/size][/size]
  
• [size=1][size=1]increased energy[/size][/size]
  
• [size=1][size=1]increased metabolism[/size][/size]
  
• [size=1][size=1]more rapid fat burning[/size][/size]
  

[size=1][size=1][b]Why do people use clenbuterol?
Clenbuterol’s initial use was as a drug for asthma and chronic pulmonary obstructive disorder (COPD). In the United States, veterinary doctors still use it for this purpose in animals.
However, since becoming available, people have also misused clenbuterol in various ways. These include:[/size][/b][/size]

• [size=1][size=1]building muscle[/size][/size]
  
• [size=1][size=1]enhancing athletic performance[/size][/size]
  
• [size=1][size=1]losing weight[/size][/size]
  
• [size=1][size=1]increasing the growth of livestock[/size][/size]
  
• [size=1][size=1]lacing other drugs, such as heroin and cocaine[/size][/size]
  

However, there is a lack of evidence that clenbuterol actually results in significant muscle gain or weight loss. Most studies on the drug have involved animals rather than humans.The World Anti-Doping Agency has banned the use of clenbuterol at all times, both in and outside of competition.
Clenbuterol dosage
When people use clenbuterol legally for asthma, the dose is 20 to 40 micrograms dailyTrusted Source.
Athletes and bodybuilders taking clenbuterol will have differing doses depending on individual factors, such as drug tolerance. They will often take the drug in a cycle that includes “on” and “off” periods.
Clenbuterol risks and side effects
Clenbuterol has serious risks for those who take it regularly, which is why many governing bodies have banned it in many countries. The risks includeTrusted Source:

• unpleasant side effects, such as anxiety, shaking, sweating, and headaches
  
• fast heart rate
  
• high blood sugar
  
• low potassium
  
• low magnesium
  
• low phosphate levels
  
• high lactate levels
  

Effects on the heart
All beta-agonists have the potential to harm the heart by making it work harder. A 2018 studyTrusted Source notes there is evidence clenbuterol can lead to:

• a fast heart rate
  
• atrial fibrillation, which is an irregular and often fast heartbeat
  
• myocardial ischemia, which is when the heart does not receive enough oxygen and blood
  

Over time, an increased heart rate forces the heart to work harder. This can lead to cardiac hypertrophy, which is when the heart grows to an atypical size.
Poisoning
Clenbuterol can cause serious poisoning and, in some cases, death. A 2020 case study notes that there is an increasing number of such cases in United States hospitals.
The symptoms of clenbuterol toxicity include:

• nausea
  
• chest pain
  
• shortness of breath
  
• agitation
  
• confusion
  
• shaking
  
• seizures
  
• rhabdomyolysis
  
• myocardial ischemia
  
• cardiogenic shock
  
• heart attack
  

Clenbuterol can be fatal, even in what seems like small doses. Most people who experience poisoning need hospital treatment.