Clenbuterol Side Effects

Clenbuterol, like any other medication, can have side effects, especially when used inappropriately or without medical supervision. The severity and likelihood of side effects may vary from person to person. Some of the potential clenbuterol side effects include:


Short-Term Clenbuterol Side Effects

Short-term clenbuterol side effects refer to adverse reactions that are more likely to occur during the initial period of clenbuterol use or with short-term exposure to the drug. These side effects can vary in severity and may subside as the body becomes accustomed to the medication.

The short-term side effects of using Clenbuterol are:

  • Headaches
  • Hypertension
  • Heart Palpitations
  • Insomnia
  • Increased heart rate
  • Restlessness/ Nervousness
  • Anxiety
  • Tremors
  • Breathing difficulty
  • Sweating
  • Dry mouth
  • Vomiting
  • Muscle cramps

Muscle Cramps Due To Clenbuterol Use

Long-Term Clenbuterol Side Effects

Long-term clenbuterol side effects refer to adverse reactions that may develop after prolonged or chronic use of the drug.

Here are some potential long-term clenbuterol side effects:

Reduction In Bone Density And Strength

Bone density is the measurement of mineral content and density in bone tissue. It is an essential aspect of bone health and is commonly used to assess bone strength and risk of fractures. Bone density is influenced by factors such as age, sex, genetics, lifestyle, and hormonal levels.

Strength refers to the physical or mental capacity of an individual to exert force or power to overcome resistance, perform tasks, or achieve goals. It is a fundamental attribute in various aspects of life and is crucial for performing daily activities, athletic endeavors, and even emotional resilience.

Reduction in bone density and strength occurs when there is a decrease in the mineral content and density of bone tissue, this leads to weaker bones that are more prone to fractures and other bone-related issues.

Clenbuterol can affect the microarchitecture of the bones, resulting in increased bone fragility.

The risk of bone fractures increases because most bodybuilders are muscular and have low bone density.

Reduced Bone Density And Strength

Heart Muscle Degeneration

Heart muscle degeneration, also known as cardiomyopathy, is a condition characterized by the deterioration and weakening of the heart muscle (myocardium). This weakening can lead to a decline in the heart’s ability to pump blood effectively, potentially resulting in heart failure and other cardiac complications.

Overdosing on Clen can lead to higher levels of collagen. But this collagen does not make your skin youthful and radiant.

Instead, collagen reduces the effectiveness of the heart’s pumping ability.

This causes undue strain on the heart muscles, leading to heart muscle degeneration.

Enlargement Of Heart Muscles

Enlargement of heart muscles is a condition in which the heart becomes abnormally larger than its usual size.

The collagen that causes damage to the heart also results in the enlargement of the heart muscles. It also causes arrhythmias in some cases. This occurs when collagen affects the electric signals that help maintain a regular heartbeat.

Since the heart can no longer pump blood effectively, the heart muscles become enlarged. This happens to maintain the required blood flow throughout the body.

Enlargement Of Heart Muscles

Detrimental Effect On Existing Heart Problems

A detrimental effect on existing heart problemsis a negative impact or exacerbation of pre-existing heart conditions or cardiovascular issues due to certain factors, behaviors, or interventions. These factors can worsen the underlying heart condition, leading to an increase in symptoms, a decline in heart function, or the development of complications.

If you already have heart problems, you should also avoid using stimulants like this one.

This is due to the increase in blood pressure and heart rate that this stimulant causes.

The increased strain on the heart can hurt preexisting heart conditions. In some cases, exercising on clen can cause an aortic enlargement.

This increases the risk of aortic rupture and sudden death is possible.

Real People With Clenbuterol Side Effects

I did some online research to check if people have suffered from side effects.

The best place to look was bodybuilding & health forums.

This is what I found:

This person was shaky, twitchy and had bad headaches after taking Clen.


This person warns about the usage of Clenbuterol after one of his friends had a massive heart attack.


Another person complaining of chest pain with Clen.

Clenbuterol Chest Pain

*Click on the images to view bigger

Clenbuterol Alternatives

Body-building supplements can be used as Clenbuterol alternatives. Most are available over-the-counter (OTC), entirely safe or without serious side effects. OTC supplements, including those marketed as clenbuterol alternatives, may contain various active ingredients and fillers, and their safety and efficacy can vary.