Clenbuterol Side Effects

Written by AlexWright

Clenbuterol is one of the most popular and talked about fat burning aids in the world of bodybuilders and athletes. It has also made it’s way into the Hollywood scene, making clenbuterol usage much more prevalent. The problem with the rise in use is the long list of possible side effects clenbuterol carries. Anyone that is considering using clenbuterol for weight loss needs to consider the list of side effects very carefully and decide whether the benefits outweigh the risks with use. I am going to provide a list of short and long term side effects with explanations to provide a full understanding of what comes along with usage.


Clenbuterol is generally used in the bodybuilding world for cutting and fat loss. It is highly effective and is a staple amongst contest preparing individuals. As with many compounds used in the bodybuilding world, there are side effects that need to be addressed and understood. It is important to understand the short and long term side effect possibilities anytime you are putting a substance into your body. After grasping the possibilities, one must then decide if the risk is worth the reward. Clenbuterol carries probabilities of short and long term side effects as listed below.

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Clenbuterol Short-term Side-effects

The list of short and long term side effects is listed below. It is important to understand that all side effects listed are “possible” but not necessarily probable. Clenbuterol can be ran safely if used conservatively and with precision. However, it is imperative that each person fully understands the negative possibilities with clenbuterol use. The list of commonly reported clenbuterol side effects includes:

  • Anxiety
  • Breathing difficulties
  • Dry mouth
  • Headaches
  • Hypertension (increased blood pressure)
  • Increased heart rate
  • Insomnia
  • Muscle Cramps
  • Nervousness/ restlessness
  • Palpitations
  • Sweating
  • Tremors (shakiness especially marked in hands)
  • Vomiting

Many of the side effects listed will slow and dissipate once clenbuterol has exited the body.

Clenbuterol Long-term Side-effects

Most studies done with clenbuterol are inconclusive and generally done on animals, not humans. While animal studies are beneficial, it needs to be noted that there are variances in reactions and possibilities with any animal study as opposed to humans. Animal studies have shown that clenbuterol can increase the size of the heart muscle. This occurs as a result of an increase in collagen. Collagen reduces the effectiveness of the heart’s ability to pump blood. This will reduce the amount of output being made. Collagen will also create problems with electrical signals coming from the heart that keep it pumping regularly. This can cause arrhythmias or irregular heart beats. This is directly correlated with causing a stroke in humans. Other studies in rats have shown degeneration of the heart cell.

Using clenbuterol can enhance and worsen a pre-existing heart condition and/or blood pressure related issues. Some thinking and studies have shown that wasting away of the left side of the heart can occur at a rapid pace with high doses of clenbuterol use. If one has a pre-existing heart condition, it would be wise to take extra precaution before use.
Clenbuterol could possibly negatively affect bones, leading to higher bone fragility. This can increase the likelihood and risk of bone fractures.
Further studies and testings are needed to determine how deep and underlying the problems from use can go and would need to be done on humans for further confirmation.

Clenbuterol symptoms can come on quickly. They may begin in a matter of minutes of ingestion and last many hours or days due to the length of the half-life.

These are the “possible” long term effects from clenbuterol use. These present more of a concern if dosing is abused and not followed with precision and delicacy. 99% of the side effects aren’t a problem if you do NOT abuse the drug.

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Is clenbuterol for you?

After reading the side effects that are possible with clenbuterol, it is now time to decide whether it is something you should use. If clenbuterol is used responsibly, it is probable for many side effects to be avoided. If you have a pre-existing condition that could be negatively affected with use, it would be wise to reconsider use. If you are one that can do things responsibly and properly, then it can be a useful and helpful addition in many types of circumstances.


The possible side effect list is long and alarming. Always be aware of every possible side effect you could be facing when making a decision to use any kind of supplement or compound. Nothing is more important than safety, health and longevity.

About the author


A NASM Certified Personal Trainer and multi-sport athlete currently working as a group instructor/personal trainer in a private gym, San Francisco, CA.