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Methosarb (Calusterone)

Chemical Composition

17 beta-OH-7 beta, 17 alpha-dimethyl-androst-4-ene-3-one
17-beta-hydroxy-7-beta, 17-dimethylandrost-4-ene-3-one
7 beta, 17 alpha-dimethyltestosterone
Molecular Weight: 316.478
Formula: C21H32O2
Melting Point (base): 128 oC
Manufacturer: Not Manufactured
Effective Dose (Men): Approx. 200 mg/day (Not FDA approved For Men)
Effective Dose (Women): Approx. 200 mg/day
Half-Life: Unknown
Detection Time: Unknown
Anabolic/Androgenic Ratio: Unknown but virtually none


Methosarb, a.k.a. calusterone, is a uniquely modified version of testosterone with dual alterations. It possesses one added methyl group at carbon 7-beta which essentially deactivates its anabolic and androgenic effects, and another one at carbon 17-alpha which permits it to pass through the liver undisturbed.

Methosarb was developed as a less (near non-toxic) alternative to traditional anabolic steroids for the treatment of inoperable and metastatic breast cancer in both men and postmenopausal women.

Steroid Form

This steroid came in 50 mg tablets, but is no longer manufactured as a prescription medication.


This extremely unique drug, barely even warrants being described as an anabolic steroid or androgen. Its substantial alteration at carbon 7-beta, renders it virtually ineffectual for anabolic and performance enhancement purposes. It is therefore not recommended for such uses, even as a supporting anabolic cycle ingredient with legendary anabolic compounds like Dianabol, Deca-Durabolin, Trenbolone, testoserone.

Although never FDA approved for men, their therapeutic dosages would be comparable to the 200 mg/day, and is not recommended for women.

Side Effects

For the Side Effects of Methosarb see the Anavar profile.

Additional Information

Some resources contend that if taken at doses high enough to increase testosterone anabolic/muscle gain levels, this drug would also suppress natural testosterone production. However, it is highly unlikely that any dosage of extremely mild Methosarb would be sufficient to elevate testosterone levels to such a degree. That is to say, even when taken in excess only so much absorption can occur, the majority of this compound would simply be eliminated via natural bodily waste functions.

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