Chlorodehydromethyltestosterone

Discover Chlorodehydromethyltestosterone (Oral Turinabol), an anabolic steroid. Learn about its medical uses, mechanisms, dosage, and potential side effect

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🏷 ATC Code: A14AA 📂 Anabolic steroids 🕐 Updated: Mar 12, 2026 ✓ Medical Reference

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What is Chlorodehydromethyltestosterone?

Chlorodehydromethyltestosterone (CDMT), widely known by its brand name Oral Turinabol, is a synthetic, orally active anabolic steroid. Developed in the 1960s by Jenapharm in East Germany, it gained notoriety as a key component of the state-sponsored doping program for athletes. Chemically, it is a derivative of methandrostenolone (Dianabol), but with a crucial alteration: a chloro-group at the 4-position, which significantly modifies its properties. This modification makes it non-aromatizable, meaning it cannot convert into estrogen, a distinct advantage over many other anabolic steroids.

Unlike some other potent anabolic steroids, Chlorodehydromethyltestosterone was designed to have a relatively favorable balance between its anabolic (muscle-building) and androgenic (masculinizing) effects. This made it appealing for athletes seeking performance enhancement with supposedly fewer severe side effects, although this proved to be a misconception over time. Today, CDMT is primarily found on the black market and is a controlled substance in many countries, making its use illegal without a prescription.

How Does it Work?

The mechanism of action for Chlorodehydromethyltestosterone, like other anabolic androgenic steroids, involves binding to androgen receptors within muscle cells and other tissues. Once bound, this complex interacts with the cell's DNA, stimulating protein synthesis and promoting nitrogen retention. These processes are fundamental for muscle growth, repair, and increased strength. The unique chemical structure of CDMT contributes to its specific pharmacological profile.

The addition of a chloro-group at the 4-position prevents the steroid from being aromatized into estrogen. This means users typically do not experience estrogenic side effects such as gynecomastia (enlarged male breast tissue) or significant water retention. Furthermore, like most oral anabolic steroids, CDMT is C17-alpha alkylated. This structural modification allows the compound to survive the first-pass metabolism in the liver, ensuring its oral bioavailability. However, this also contributes significantly to its potential for liver toxicity, a common concern with C17-aa steroids.

Its unique profile—high anabolic activity, moderate androgenic effects, and no aromatization—made it attractive for athletes looking for 'clean' gains, meaning lean muscle mass without the bloating associated with estrogen conversion.

Medical Uses

In its early history, Chlorodehydromethyltestosterone did have legitimate medical applications, albeit limited. It was prescribed for conditions where an anabolic effect was desired, such as muscle wasting diseases, osteoporosis, and in cases of delayed puberty. Its ability to promote protein synthesis and increase bone density made it a viable option for a short period.

However, due to the emergence of other, safer therapeutic options and a growing understanding of the side effects associated with anabolic steroids, its medical use has largely been discontinued. Today, its primary association is with illicit performance enhancement, particularly in bodybuilding and athletics. Users seek CDMT for its reputed ability to promote lean muscle gains, increase strength, and improve athletic performance without significant water retention or estrogenic side effects. It is often incorporated into 'cutting cycles' to preserve muscle mass during caloric deficits or in 'bulking cycles' for quality, dry gains.

It is crucial to understand that using Chlorodehydromethyltestosterone outside of a medical prescription is illegal and carries significant health risks. Its classification as a controlled substance underscores the serious concerns regarding its unsupervised use.

Dosage

The medical dosage of Chlorodehydromethyltestosterone, when it was prescribed, would have been carefully controlled by a physician. However, for its current illicit use in performance enhancement, dosages vary widely and are often based on anecdotal evidence rather than scientific guidelines. It is important to reiterate that such use is illegal and carries substantial health risks.

Typically, for male athletes seeking performance enhancement, dosages might range from 15-40 mg per day. Cycles often last between 6 to 8 weeks. Higher doses are sometimes reported, but these significantly increase the risk of adverse side effects, especially liver toxicity. For females, if used, dosages are considerably lower, usually in the range of 2.5-10 mg per day, to minimize the risk of virilization (development of male characteristics). Even at low doses, virilization remains a significant concern for women.

Due to its relatively short half-life, users often split the daily dosage into two administrations to maintain stable blood levels. Post Cycle Therapy (PCT) is commonly advised after a CDMT cycle by illicit users to help restore natural testosterone production, which is suppressed by exogenous steroid use. However, these practices are unregulated and carry inherent dangers.

Side Effects

Despite its reputation for being a 'milder' anabolic steroid, Chlorodehydromethyltestosterone is not without significant side effects. The most prominent concern is its hepatotoxicity. As a C17-alpha alkylated compound, it places considerable strain on the liver, and prolonged or high-dose use can lead to liver damage, including elevated liver enzymes, cholestasis, and even peliosis hepatis.

Other potential side effects include:

  • Cardiovascular Issues: CDMT can negatively impact cholesterol levels, typically by increasing LDL ('bad') cholesterol and decreasing HDL ('good') cholesterol. It can also contribute to hypertension (high blood pressure) and increase the risk of cardiovascular disease.
  • Testosterone Suppression: Like all anabolic steroids, CDMT suppresses the body's natural production of testosterone. This can lead to symptoms such as fatigue, decreased libido, erectile dysfunction, and mood disturbances after the cycle, necessitating Post Cycle Therapy for illicit users.
  • Androgenic Side Effects: While less androgenic than some other steroids, CDMT can still cause androgenic effects, including acne, accelerated hair loss in those predisposed to male pattern baldness, and increased body hair growth. In women, virilization symptoms such as deepening of the voice, clitoral enlargement, and menstrual irregularities are a significant risk, often irreversible.
  • Psychological Effects: Mood swings, increased aggression, irritability, and depression are possible.
  • No Estrogenic Side Effects: A positive aspect is that CDMT does not aromatize, so estrogenic side effects like gynecomastia and water retention are rare.

The severity and likelihood of these side effects are dose-dependent and vary among individuals.

Drug Interactions

When considering the use of Chlorodehydromethyltestosterone, especially its illicit use, understanding potential drug interactions is critical due to its impact on the liver and other bodily systems. As an orally active, C17-alpha alkylated steroid, CDMT places significant stress on the liver, making interactions with other hepatotoxic substances particularly dangerous.

  • Other Hepatotoxic Drugs: Concomitant use with other medications known to be liver toxic, such as acetaminophen (paracetamol) in high doses, certain antifungals, or other C17-aa anabolic steroids, can dramatically increase the risk of liver damage.
  • Anticoagulants: Anabolic steroids can enhance the effects of oral anticoagulants (blood thinners) like warfarin, potentially leading to an increased risk of bleeding. Dosage adjustments of anticoagulants may be necessary under strict medical supervision.
  • Insulin and Oral Hypoglycemics: CDMT may affect glucose metabolism, potentially altering the requirements for insulin or oral hypoglycemic agents in diabetic patients. Close monitoring of blood glucose levels is advised.
  • Corticosteroids: Concurrent use with corticosteroids may increase the risk of edema (fluid retention).
  • Alcohol: Consuming alcohol while using CDMT significantly exacerbates the strain on the liver, increasing the risk of liver damage.

Given the severe health risks and legal implications, it is paramount to avoid self-medication and to consult a healthcare professional regarding any medication use, especially if considering substances with potent pharmacological effects like Chlorodehydromethyltestosterone.

FAQ

Is Chlorodehydromethyltestosterone legal?

No, Chlorodehydromethyltestosterone is a controlled substance in many countries, including the United States, due to its classification as an anabolic steroid. Its non-medical use is illegal and carries severe penalties.

Does Turinabol cause gynecomastia?

No, Oral Turinabol (CDMT) does not aromatize into estrogen. Therefore, estrogenic side effects such as gynecomastia (enlarged male breast tissue) and significant water retention are generally not associated with its use.

How quickly does CDMT work?

Users typically report noticing effects from Chlorodehydromethyltestosterone within a few weeks of starting a cycle, with strength gains and lean muscle development becoming apparent relatively quickly.

Can women use Chlorodehydromethyltestosterone?

While some female athletes have used Chlorodehydromethyltestosterone, it carries a significant risk of virilization (development of male characteristics) even at low doses. These effects, such as deepening of the voice, clitoral enlargement, and body hair growth, can often be irreversible.

Is Chlorodehydromethyltestosterone liver toxic?

Yes, as a C17-alpha alkylated oral steroid, Chlorodehydromethyltestosterone is hepatotoxic. It places a strain on the liver, and prolonged or high-dose use can lead to liver damage.

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Summary

Chlorodehydromethyltestosterone (CDMT), widely known as Oral Turinabol, is a potent synthetic anabolic steroid with a unique profile. Developed in East Germany, it was designed to offer significant anabolic effects with reduced androgenic and no estrogenic side effects. Its mechanism involves binding to androgen receptors, stimulating protein synthesis and nitrogen retention, leading to muscle growth and strength gains. While it had limited historical medical uses for conditions like muscle wasting, its primary association today is with illicit performance enhancement in bodybuilding and athletics.

Despite its reputation for being a 'milder' steroid, CDMT carries significant health risks. Chief among these is its hepatotoxicity due to its C17-alpha alkylated structure, which necessitates careful consideration of liver health. Other potential side effects include adverse cardiovascular effects, natural testosterone suppression, and androgenic side effects such as acne and hair loss. Women face a high risk of irreversible virilization. Due to its controlled substance status and serious health implications, unsupervised use of Chlorodehydromethyltestosterone is illegal and strongly discouraged. Individuals seeking to enhance physical performance should always prioritize legal, safe, and medically approved methods, consulting healthcare professionals for guidance.