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Clenbuterol FAQ: Everything you need to know about Clen I wrote this because of all the confusion that surrounds this drug. Enjoy.
What is Clenbuterol? Clenbuterol is a beta-2 agonist and is used in many countries as a broncodilator for the treatment of asthma. Because of it’s long half life, Clenbuterol is not FDA approved for medical use. It is a central nervous system stimulant and acts like adrenaline. It shares many of the same side effects as other CNS stimulants like ephedrine. Contrary to popular belief, Clenbuterol has a half life of 35 hours and not 48 hours.
Dosing and Cycling Clenbuterol comes in 20mcg tablets, although it is also available in syrup, pump and injectable form. Doses are very dependent on how well the user responds to the side effects, but somewhere in the range of 5-8 tablets per day for men and 1-4 tablets a day for women is most common. Clenbuterol loses its thermogenic effects after 6-8 weeks when body temperature drops back to normal. It’s anabolic/anti-catabolic properties fade away at around the 18 day mark. Taking the long half life into consideration, the most effective way of cycling Clen is 2 weeks on/ 2 weeks off for no more than 12 weeks. Ephedrine can be used in the off weeks. Clenbuterol vs Ephedrine vs DNP
Ephedrine will raise metabolic levels by about 2-3 percent and 200mg of DNP raises metabolic levels by about 30 percent. Clenbuterol raises metabolic levels about 10 percent and it can raise body temperature several degrees.
DNP is by far the most effective fat burner but many people will never use it because of the risks associated with it. It also offers no anti-catabolic benefit. Although it does have anti-catabolic effect, ephedrine short half life prevents it from being all that effective.
As far as side effects, Clenbuterol’s are certainly milder than DNP’s, and some would even say milder than an ECA stack. There is no ECA-style crash on Clenbuterol and many users find it easier on the prostate and sex drive. This may in part be due to the fact that Clen is generally used for only 2 weeks at a time.
INCREASED BLOOD PRESSURE
The most significant side effects are muscle cramps, nervousness, headaches, and increased blood pressure.
Muscle cramps can be avoided by drinking 1.5-2 gallons of water and consuming bananas and oranges or supplementing with GNC potassium tablets at 200-400mg a day taken before bed on an empty stomach.
Headaches can easily be avoided with Tylenol Extra Strength taken at the first signs of a headache. You may need to take double the recommended dose.
Post-Cycle Therapy: Clen is used post cycle to aid in recovery. It allows the user to continue eating large amounts of food, without worrying about adding body fat. It also helps the user maintain more of his strength as well as his intensity in the gym. Diet: Roughly the same as on cycle.
Fat loss: The most popular use for Clen, it also increases muscle hardness, vascularity, strength and size on a caloric deficit. For the most significant fat loss, Clen can be stacked with t3. Diet: A high protein(1.5g per lb of bodyweight), moderate carb(0.5g to 1g per lb of bodyweight), low fat diet(0.25g per lb of bodyweight) seems to work best with Clen.
Alternative to Steroids: Clenbuterol has mild steroid-like properties and can be used by non AS using bodybuilder to increase LBM as well as strength and muscle hardness. Diet: A moderate carb, high protein, moderate fat diet work well.
Stimulant/Performance Enhancement: It can be used as a stimulant, but an ECA stack may be a better choice because of it’s much shorter half-life. Diet: To take full advantage of the stimulatory effects of Clen, Carbs must be included in the diet. Keto diet do not work well in this case.
Precautions: Is Clen for you?
The same precautions that apply to Ephedrine must be applied to Clen, although some people find ECA stacks harsher than Clen. It should not be stacked with other CNS stimulants such as Ephedrine and Yohimbine. These combinations are unnecessary and potentially dangerous. Caffeine can be used in moderation before a workout for an extra kick, although its diuretic effects may shift electrolyte balance. Drink more water if you use Caffeine.
What else do I need to know?
Most users that report bad side effects and discontinue use are those who use high doses right at the start of the cycle. The worst side effects occur within the first 3-4 days of use.
A first time user should not exceed 40mcg the first day.
Example of a first cycle:
Day5: 80mcg(Note: Increase the dose only when the side effects are tolerable)
Day13: 80mcg (Tapering is not necessary, but it helps some users get back to normal gradually)
Day 17: ECA/ NYC stack
Example of a second cycle:
Day 17: ECA/ NYC stack
Do not take Clen Past 4pm and drink plenty of water: 1.5-2 gallons a day.
All brands are not equal when it comes to Clen, different brands will yield different results.
That about covers everything.
Presser, thanks for the article I found it very useful. I'm about to start a cycle for the first time next week.
One question in terms of your dosage suggestion. Do you take tablets through out the day I.e. On 60mcg day one in the morning, one mid morning and then one early afternoon, or do you ou just take them all in one go, say, in the morning?
I am in the Army.. Do you know if this shows up on a drug test as anything? Thanks!!
I just got off cycle and this article makes me want to run a clen cycle. hmmm. why not! Sounds like a good idea to help with my priming for next cycle to lose some bf.
I may need something like this. I thought giving up beer and eating right would do it but i haven't lost a pound in 6 weeks... I need one of those pinchers to measure progress.... i actually gained weight but I know it can't be fat.
Well it was nice to get a two week break to feel normal. Counting down the days to take it and today is the day. Within thirty mins back to shaking like a leaf. haha. here we go again.
What is Clenbuterol and what does it do?
Clenbuterol (often referred to simply as 'Clen') is not a steroid, but a Beta 2 Sympathomitetic and central nervous system (CNS) stimulant. It is a specific agonist, stimulating the adrenergic beta 2 receptors. It is used in certain countries in a medical sense as a bronchodilator in the treatment of asthma, though not in the UK and USA, mainly due to its long half life.
Athletes and bodybuilders use the drug due to its thermogenic and anti-catabolic effects. This is down to its ability to slightly increase the body's core temperature, thereby raising calorie (energy) expenditure. It is thought that a 1°F increase yields around a 5% increase in maintenance calories burned. Studies on livestock suggest that clenbuterol also has anabolic properties. However, this seems not to be the case in humans, thought to be due to the fact that humans lack the abundance of beta 3 receptors which increase insulin production and sensitivity.
Clenbuterol is dosed in micrograms (mcg/µg), most commonly in tablet form, though there are other forms of administration such as liquids, nasal sprays and injectables. Note: Although dosages are in microgram amounts, many manufacturers will list the active ingredient as milligrams (mg), so a tablet of 20mcg will be labelled as 0.02mg.
Clenbuterol side effects/possible implications?
Side effects are dose dependant, though most users will find that most tend to subside with persistent use. Caution is advised when employing the use of Clenbuterol in conjunction with other adrenoceptor agonists as side effects are likely to be cumulative. It is for this reason that it is generally not recommended to use ephedrine/ephedra (or ma huang) or the ECA stack (ephedrine-caffeine-aspirin) whilst using clen.
Common side effects of clenbuterol include:
Muscular tremors (especially hand shakes)
Hypertension (high blood pressure)
Possible cardiac hypertrophy as clen also targets cardiac and smooth muscle fibres
Heart muscle necrosis has been demonstrated in animal studies
In view of the above side effects, it is obvious to assume that anyone with cardiac issues and/or hypertension should not use a stimulant such as Clenbuterol and caution must be observed by those already using similar compounds in the treatment of existing medical conditions. In addition, there is very little conclusive knowledge of the cardiac effects of supra-physiological dosages in humans.
Commonly used doses
It is well known that Clenbuterol use results in rapid down-regulation of beta 2 receptors. This is due to the powerful stimulatory effect of the drug. It is therefore pointless to use clen for long periods without a break. Some believe that a two day on, two day off dosing schedule will allow adequate potential for receptor up-regulation. However, I doubt this to be the case due to the relatively long half life of clen, resulting in continued stimulation even throughout the 'off' days. A much better regime would be a two week on, two week off cycle. Maximum plasma levels are reached around 2-3 hours after oral administration, and terminal half life at 34 hours (Zimmer, 1976).
A tapering up of dosages is recommended in an attempt to limit harsh side effects. Most commonly, a user will start by taking one 20mcg tablet on day 1, followed by an increase of one tablet on subsequent days. Subject to personal tolerance levels, a dosage of 140mcg (seven tabs) will be used by day 7, and this level should be maintained for the entire second week. It would be fruitless to exceed seven or eight tablets daily due to receptor over-saturation. There is no requirement to taper down.
For the next 'cycle' of clen (i.e. weeks 5 & 6), there is no requirement to taper up from one tablet as your tolerance level should now be known. As an example, if the user finished the first cycle of clen on 7 tabs, they could recommence at a slightly lower dose of 4 or 5, and taper up again from this level. Again though, the user should again limit their intake to 7 or 8 tabs daily.
During the two 'off' weeks, an ECA stack can be used as required. ECA will not cause such a pronounced down regulation and desensitization of the receptors, certainly not to the extent of clen. Ephedrine has a short half life in contrast to clen which results in times throughout the day where the betas will partially recover from stimulation by adrenaline and nor-adrenaline. Potency is also much weaker that that of clen, as it is not a specific agonist. Ephedrine is also thought to increase the conversion of endogenous/exogenous T4 to T3 through the activation of deiodinase enzymes responsible for this process. This is important as clen is known to slow the rate of T4 to T3 conversion. As a side note, some bodybuilders will use T3 concurrently with the Clenbuterol/ECA cutting cycle (together with certain anabolic/androgenic steroids no doubt!) in an attempt to at least maintain plasma T3 levels.
Cycles of Clen/ECA are normally limited to 12 weeks in total, though are often shorter.
Female dosages tend to be slightly lower than those of male users, with an upper limit of 80-120mcg (4-6 tabs).
Aside from its fat burning properties, Clen is often used as an anti-catabolic to maintain muscular gains following a steroid cycle. A dosage of 40mcg daily would be suited to this situation.
There is no particular requirement to split the dosage throughout the day due to the long half life. Most will take the full daily dose in the morning, though some prefer to take their dose just before bed in an attempt to avoid most of the side effects as they sleep.
Some user accounts suggest that splitting the dose may lessen side effects slightly. It is a trial and error process in essence, to ascertain which method suits you personally.
Cramping whilst using Clenbuterol is a fairly common side effect. This is most probably due to depletion of the amino acid taurine in the liver together with deficits in the electrolytes sodium and potassium, as well as inadequate hydration. Taurine helps stabilize cell membranes and prevent nerves from becoming over-excited. Some studies show that giving taurine supplements relieves painful muscle cramps. Japanese researchers found that the longer rats exercised, the more taurine they lost from their muscles (Matsuzaki et al, 2002).
Symptoms of cramping may be alleviated by:
Eating fruit particularly bananas
Ensuring adequate hydration
Taurine supplementation - 3-5g daily
Potassium supplementation - 200-400mg daily taken before bed on an empty stomach
Ketotifen is an anti-histamine used medically to treat bronchial asthma and allergies. It has a sedative and depressant effect on the brain. It acts by decreasing the release of histamine which is a chemical released when an allergic reaction occurs. Ketotifen blocks the action of histamine on special histamine receptors and reduces the nerve response when an allergic reaction occurs.
Histamine is the chemical in the body that causes the symptoms of an allergic (hypersensitivity) reaction. These can include inflammation of the skin, airways or tissues, rashes, itching and of the skin, eyes or nose, nasal congestion and narrowing of the airways. By blocking the actions of histamine, ketotifen may prevent and relieve the narrowing of the airways that occurs in asthma due to allergies.
However, bodybuilders are interested in the drug as it has been shown to inhibit the down regulation of the beta receptors, including the beta 2s that clen stimulates. As long as you are taking ketotifen, it will continue to clean these receptors, never allowing them to downregulate, even while on a heavy clen cycle. That means you can continue to take clen indefinitely without having to cycle off to regenerate the receptors. A dose of 2-3mg daily can upregulate even severely shut down receptors within a week.
It also means that you don't need as much clen to get the same benefits. It seems you can take about 30-40% less clen and it be equally effective.
No studies have been done to find the most effective dose though most users should find 3-4mg daily ideal, which can be split or taken in one sitting. Higher doses are likely to cause (sometimes severe) drowsiness and increase appetite.
- Matsuzaki et al (2002). Decreased taurine concentration in skeletal muscles after exercise for various durations. Med & Sci Sp & Ex. 34(5):793-797.
- Zimmer (1976). Single and multiple applications and metabolite pattern of clenbuterol in man (author's transl). Arzneimittelforschung 26(7a):1446-50.
Last edited by Presser; 03-05-2014 at 10:46 AM.
What's up fellas! Noob to the site and likin it. Just ordered the aqua burn & cyto burn combo for the wife and I. Couldn't really find a good clen stack to go with, but after doin much research on this site we thought the aqua and cyto seemed pretty good. For those out the who have used it, what can be expected comparing this to clen and t3? And also dealing with cyber suppz? They seem pretty legit but just wanting to seeing what every one else thinks. My stats by the way are 5'7" 226# around 16-18% bf.
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And bump for an awesome post concerning clen. Great info.
The comparison is remarkable bro ! Be careful with it! SERIOUSLY !!
Cool! Thanks fellas! I'm actually pretty pumped about trying this out. Thanks for a the precautions and I'll be sure to follow them no doubt. Anyone have a wag for dosing? I can probably figure out mine but any further info is awesome, but as for the wife, that is a different story. She's 5'4" about 120-125% ish. Maybe in the 10-15% bf range.
just remember the aqua-burn is 200mcg per 1ml, and 1ml is one filled dropper, you DO NOT wanna take one filled dropper, you want to start with 1/10th of that which would be 20mcgs,
welcome to MC nubly. try starting a new thread to get more responses
Hi Mr. Presser. I want to ask a question. I did some googling and could not find an answer. I was about to start taking Clen till I realized something.
I have Glucose-6-phosphate dehydrogenase (G-6-PD) deficiency. Can I still take Clen (only clen, not stacking with anything else) ? I'm worried i'd die on the 1st day of clen.
P/S: thank you for such informative thread on clen.
Hey all. Newbie here. Started a clen cycle for the first time today. 20mcg to start. I'll be taking progress pictures, if it works out I'll post them haha.
Newbie here. Great info here as well. Just started my 1st clen cycle 4 days ago. Today is my 1st day @ 120 mcg/day and have experienced no shakes thus far. Are shakes a sure sign? I have experienced a slight headache. I dont take them all at once, i split them into 2 dosings a day. So are shakes a sure thing?