Clenbuterol Side Effects : Dangers Of Using The Weight Loss Drug Clenbuterol

Clenbuterol is a fat loss drug often used by bodybuilders in their cutting cycle when they need to lose as much fat as possible and retain lean muscle mass. Even though it works well the clenbuterol side effects can be dangerous and harmful.

This weight loss drug often referred to as “clen” is one of the most potent drug for weight loss and is also used as performance enhancing drug.


Clenbuterol is legal in some countries via prescription to treat breathing disorders and asthma.

It can be used as a bronchodilator for individuals suffering from asthma.

Here’s the deal:

The main reason people use it is because it has very powerful weight loss effects and it works well and fast.clenbuterol side effects

FDA has banned the use of clenbuterol which means it will be detected in a drug test.

This extremely powerful weight loss drug is used to shed away unwanted body fat, enhance performance and retain muscle mass while cutting.

Clenbuterol is very effective because:

It works by increasing oxygen flow, boosting aerobic capacity and increasing the metabolic rate making which will give you a performance enhancement which results in rapid fat loss.

You can see before and after results of using clenbuterol here.

Clenbuterol is a stimulant and a thermogenic drug.

clenbuterol side effectsIt increases the bodies temperature and the outcome of this process is that your body uses more body fat as an energy source.

It’s mostly used by bodybuilders in their cutting phase, when they need to lose unwanted fat while preserving muscle mass.

Animals have been fed clenbuterol to increase their muscle mass and decrease fat so farmers can sell more meat from each animal.

However this practice is banned in most countries.

The worst part?

The Clenbuterol side effects can be dangerous and there is definitely a reason why this drug is not legal.

The best part?

The supplement industry has been able to formulate a supplement that works similarly as clenbuterol but without side effects.

So you can get the benefits of clenbuterol without actually using it!

We will discuss this supplement later on in this article.

Clenbuterol Benefits

clenbuterol side effects

There is clearly a reason why clenbuterol is used by a variety of people for weight loss.

It delivers great results if used along with a good diet and exercise regime.

The main benefits of clenbuterol are:

Thermogenic effect in the body

Clenbuterol has thermogenic effects on the body, which simply means it will increase the internal temperature in the body.

This results in more fat loss and more calories burned throughout each day.

Increases the metabolism

The metabolism is kind of like the fat loss machine inside of our body.

With a higher metabolism we burn off more calories.

Clenbuterol increases the metabolism in our body, resulting in overall more fat loss.

Builds muscle while losing weight

Study shows that with a 2 weeks cycle of clenbuterol individuals dropped 15.4% in body fat percentage while increasing lean muscle mass 4.3% after using the drug for only 2 weeks.

So it has some scientific proof of effectiveness and will not only help build muscle but also build muscle mass.

You can see complete list of clenbuterol benefits in our article here.

What you can also do is use clenbuterol alternatives which are completely safe and deliver similar effects as real clenbuterol.

However as we have said numerous times.

The clenbuterol side effects can be nasty.

Now we will discuss the most common clenbuterol side effects you should be aware of before ever using the drug.

And for the record, we do not recommend using clenbuterol because it comes with health risks.

Most Common Clenbuterol Side effects

clenbuterol side effects

There are a few common clenbuterol side effects that most users experience while using clen.


If you are planning on using Clenbuterol then it is highly likely that you will experience these side effects.

  • Tremor: Most users get shaky hands while using clenbuterol.

Unfortunately there is not anything you can do to avoid this side effect.

Often times when users get accustomed to using the drug the shakiness declines.

This is one of the reason why you cannot take a large dose of Clenbuterol when you first start using the drug.

Clenbuterol cycles are most of the time very low at the beginning of the cycle but increase with time.

The bottom line?

Doses have to be slowly raised with time so the body can get used to the drug.

  • Muscle Cramps: This very common side effect is caused by lack of taurine.

Clenbuterol drains Taurine in the muscle tissue.

The results of the lack of Taurine can cause painful muscle cramps.

It is recommended to supplement with Taurine when using clenbuterol to avoid getting muscle cramps.

  • Nausea: Clenbuterol is a stimulant and users may experience nausea when using it.

This is especially common among people sensitive to stimulants.

  • Headaches: Clenbuterol increases blood pressure which may result in a headache.

The headaches tend to decrease when the body gets accustomed to the drug.

Keep this in mind:

High blood pressure can be extremely dangerous and it’s recommended to have it checked regularly if you are using the drug.

High blood pressure for a long period of time can be fatal,  can damage the heart, kidneys and organs in your body.

  • Sweating: When you use clenbuterol your body uses more fat tissue as an energy source.

Clenbuterol has thermogenic effect in the body, which means that it raises it’s internal temperature.

This process can result in sweating.

  • Insomnia: Since clenbuterol is a stimulant and the effects of it can last for more than 36 hours many users experience insomnia.

When the body gets more adapted to the drug the insomnia should decline.

  • Irregular heart beats: Clenbuterol can raise the heart rate and cause irregular heart beats.

This is because of the stimulating effects it has on the body.

Here’s what’s interesting

Clenbuterol is often mistaken for an anabolic steroid and many people believe that clenbuterol has the same side effects as anabolic steroids.

This is not true and Clenbuterol is not a steroid, even though it is a drug.

The bottom line?

To make things clear Clenbuterol will not cause side effects such as hair loss, deepening of voice in women, male pattern baldness in men and gyno in men.

Complete list of All Clenbuterol side effects and dangers:

clenbuterol side effects

  • Hypertension (High blood pressure)
  • Nervousness
  • Raised heart rate
  • Sleeping problems
  • Muscle weakness
  • Heat intolerance
  • Diarrhea
  • High temperature that may cause death
  • Stroke
  • Heart failure
  • Vision Loss
  • Chronic Kidney disease
  • Muscle cramps
  • Dry Mouth
  • Vomiting
  • Tremor (Shaking body)
  • Palpiations (irregular heart beat)
  • Anxiety
  • Sweating
  • Breathing Difficulties
  • Thyrotoxicosis
  • Subaortic stenosis
  • Tachycardia
  • Insomnia
  • Water loss
  • Nausea
  • Cardiac Hypertrophy
  • Redistributive effects on white blood cell counts
  • Increased appetite
  • Flulike symptoms
  • Muscle spasm
  • Hypomania
  • Addiction to clenbuterol
  • Depression
  • Widened pulse pressure
  • Chest pain
  • Elevated troponin
  • Hyperglycemia
  • Tachypnea
  • Elevated creatine phosphokinase (CPK)
  • ST changes on electrocardiogram (ECG)

These side effects are not guaranteed but have been reported.

Clenbuterol Side Effects Females

clenbuterol side effects

Women will most likely experience the same common side effects as men.

Here’s the deal:

Most women are lighter than men which could make them more vulnerable to side effects especially if they take a high dose of clen.

The most common female clenbuterol side effects women experience are:

  • Tremor (shaking hands)
  • Muscle cramps
  • Difficulty sleeping
  • Sweating
  • Headaches
  • Irregular heartbeats

As we have discussed before in this article Clenbuterol is NOT a steroid and won’t cause side effects such as hair loss, excessive hair growth, deepening voice or enlarged clitoris in women.

Clen Supplement Without Side effects – Clenbutrol

clenbutrol side effects

Clenbutrol by Crazybulk is a natural and safe clenbuterol alternative that works fast to lose fat.

In todays day and age premium supplement companies have been able to formulate clenbuterol alternatives that are both safe and legal.

Here’s how they work:

These supplements mimic the effects of real clenbuterol without the side effects.

So you don’t have to risk your health to get a much needed weight loss boost.

If you are a person who needs to lose weight fast but are not willing to risk your health you could use an effective supplement called Clenbutrol.

The best part?

Clenbutrol is very effective to lose fat quickly, safe, 100% legal and comes with no side effects.

Results from using Clenbutrol by Crazybulk have been reported on several websites and it has been proven to be very powerful for fat loss.

Users generally see results within 30 days of using this supplement.

Clenbutrol by Crazy Bulk

Clenbutrol is our favourite Clenbuterol alternative because it works very well to rapidly lose un wanted body fat and is very safe to consume.


  • 100% safe and legal
  • Works very well to lose weight
  • Helps maintain muscle mass
  • Contains only natural ingredients
  • Results within 30 days
  • Improves performance
  • No side effects
  • Buy 2 Get 1 Free
  • Free worldwide shipping


  • Premium priced product
  • Can only be bought straight from their official website

More info:

  1. Vist CrazyBulk’s website to buy => Clenbutrol
  2. Read our top 2 legal Clenbutrol alternatives guide => Top 2 Clenbutrol alternatives

References and scientific studies

A descriptive study of adverse events from clenbuterol misuse and abuse for weight loss and bodybuilding.

Side effects of clenbuterol as a repartitioning agent.

Author: James / Founder of BroScience

I started this site back in 2014 because I was tired of the fitness industry telling guys like me lies.

Getting ripped doesn't have to be so hard... I'm here to give you the truth! The no bullsh*t advice.

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