+- BodyTecHub (https://bodytechub.com)
+-- Forum: Investigational/Steriods Tablets (https://bodytechub.com/forumdisplay.php?fid=18)
+--- Forum: Clen 40mcg (https://bodytechub.com/forumdisplay.php?fid=36)
+--- Thread: What You Need to Know About Clen for Bodybuilding (/showthread.php?tid=205)
What You Need to Know About Clen for Bodybuilding - dreamdragon221 - 07-14-2026
What Is Clenbuterol?
Clenbuterol is a bronchodilator, which means it relaxes the muscles around the airways and opens them to make breathing easier. This is why it is prescribed to treat asthma and breathing problems.
It works by activating beta2-adrenergic receptors. Other similar bronchodilators are albuterol and formoterol, which are approved in the U.S. for asthma and other lung conditions.
Clenbuterol is a long-lasting bronchodilator, so it can stay in your body for up to 39 hours after you take it.
What Are the Risks and Side Effects of Clenbuterol?
When clenbuterol is prescribed to treat asthma in other countries, the dose is usually 0.04-0.06 milligrams per day. Athletes and bodybuilders who use clenbuterol — also called clen — typically take two to three times that amount (0.06 to 0.12 milligrams) per day. Even at low doses, clenbuterol can be toxic.
There are several dangerous side effects to be aware of:
- Agitation
- Anxiety
- Atrial fibrillation
- Chest pain
- Enlarged liver (hepatomegaly)
- Heart attack
- Heart palpitations
- Increased heart rate (tachycardia)
- Lowered blood potassium (hypokalemia)
- Low blood pressure
- Muscle tremors
If you take clenbuterol and experience any of these side effects, immediately stop using it and get help from a doctor.
- RELATED:Targeted Relief for Muscle and Joint Pain
Why Do Bodybuilders Use Clenbuterol?
Clenbuterol is not a steroid, but it acts a bit like one. It can build lean muscle mass and decrease fat. So, bodybuilders misuse clenbuterol to reshape their bodies. They may take clenbuterol along with anabolic steroids or growth hormone. Some may have body dysmorphia, thinking that their body is flawed and not muscular or strong enough.
Although not approved for use, it is banned by the World Anti-Doping Agency and the International Olympic Committee. It has several side effects, but many athletes still misuse “clen” for these reasons:
Burning fat
Clenbuterol increases the resting metabolic rate by 10%-50%. That means your metabolism is primed to burn more calories.
Energy is stored in the body’s cells, including fat cells. When your body uses stored energy, it will burn the sugars and fats you’ve stored. This can reduce your body fat and overall weight.
Building muscle
The same beta2-adrenergic receptors that activate when taking clenbuterol for asthma also help increase lean muscle mass while decreasing body fat. Because of such effects, clenbuterol is sometimes seen as an alternative to anabolic steroids — the drugs that typically come to mind when you think of performance-enhancing substances. Anabolic steroids also increase lean muscle.
“Clen” is not a steroid. But in animals, it has shown some effects similar to steroids.
Increasing stamina
Because clenbuterol is a bronchodilator, it opens up your airways when you take it. Having more airflow increases the amount of oxygen available. For athletes, it allows them to perform harder and better.
What class of drug is clenbuterol?
Clenbuterol is a beta2-adrenergic agonist, also known as a bronchodilator. It is not FDA-approved in the U.S. for people. It is approved to treat blocked airways in horses but cannot be used in animals raised for food production.
What are the effects of clenbuterol for women?
Clenbuterol may be more popular than anabolic steroids with female bodybuilders because of fewer side effects. Anabolic steroids typically cause side effects such as increased facial hair, thickening of the skin, and deepening of your voice. Clenbuterol is not known to cause these. Women taking anabolic steroids have reported disrupted menstrual cycles, but it's not known if clenbuterol affects menstruation.