Methyltrienolone R1881 Profile
Pharmaceutical Name: Methyltrienolone
Chemical Structure: 17beta-Hydroxy-17-methylestra-4,9,11-trien-3-one
Chemical Formula: C19H24O2
Molecular Weight: 284.3974
Active Life: four to six hours
Anabolic/Androgenic Ratio: approximately 12 000/6 000
Methyltrienolone is essentially the same compound as trenbolone that has gone
under 17 alpha alkylation so that it can remain active after oral
administration. So in a basic sense, methyltrienolone offers all of the
advantages of trenbolone with the added bonus of being orally active. However,
that extra benefit comes with a hefty price when it comes to hepatoxicity as
will be demonstrated below.
Like trenbolone methyltrienolone has an extremely strong binding affinity for
the androgen receptor as well, even surpassing that of testosterone. This of
course supports the assertion that trenbolone is extremely anabolic as by
binding to the androgen receptor a compound is able to activate the anabolic
mechanisms that are dependent upon the androgen receptor, one of the many ways
that anabolic steroids aid muscle growth. Androgen receptors also exist in
adipose tissue. When stimulated by way of a compound such as methyltrienolone
binding to them, this can result in a higher then normal lipolytic action (1).
So not only does this drug help to build muscle, it can help to burn fat.
Another rather unique characteristic of methyltrienolone is its anti-catabolic
abilities. Methyltrienolone binds with the receptors that interact with
glucocorticoid hormones, these being catabolic hormones (2). By being able to
inhibit cortisol and some other catabolic hormones in the body methyltrienolone
is ideal for those users that are attempting to reduce body fat as the compound
will help to minimize muscle wasting when running a calorie deficit.
Use and Dosing of Methyltrienolone
Methyltrienolone was originally developed by a French pharmaceutical company,
but never commercially produced due to its severe hepatoxic effects. That should
indicate how truly harsh this drug is. For this reason it is important that
users use caution when dosing this drug and ensure that they keep their cycles
of it to brief periods of time. This would also include the exclusion of other
steroids that are overly hepatoxic, such as 17 alpha alkylated oral steroids.
In terms of cycle duration, four weeks is the standard length that most users
limit themselves too if not shorter. Any extension of this time would absolutely
necessitate continuous blood tests conducted by a doctor, something that is a
good idea no matter how long a user intends to run this drug. Of course,
individual response to the drug and the liver function of a user would also
factor into how well a user is able to tolerate methyltrienolone and thereby run
As for dosing, since little research has been conducted using methyltrienolone
since its first production we are left to use anecdotal information to determine
exactly how much of the compound one should administer to see its benefits as
well as limiting the side effects. Doses ranging from 400-800 micrograms for
male users are quite normal for most. Females are not recommended to administer
this drug, as will be discussed in the section below. Of course like all drugs
doses much higher then these have been run. This also has led to a much higher
reporting rate of negative side effects, including temporary liver conditions
such as jaundice. For this reason it is recommended that users remain quite
careful whenever initially dosing this compound, as well as any increases that
they may make.
Risks and Side Effects while using Methyltrienolone
Similar to trenbolone, methyltrienolone does not exhibit any estrogenic activity
and therefore estrogenic side effects are not a concern with this compound
itself. It is also resistant to the 5 alpha reductase enzyme, but this is of
little comfort to a user as methyltrienolone is already of the most androgenic
drugs in common use by steroid users. For this reason androgenic side effects
should be expected by most users that undertake a cycle of this drug. Prostate
enlargement and oily skin/acne are commonly reported by users. The effect of the
drug on the hair of the user should also close to that of trenbolone.
Anecdotally many users have reported that trenbolone is one of, if not the,
harshest compound for losing one's hair. The same can be said of
methyltrienolone. If a user is genetically predisposed to male pattern baldness
he may want to avoid this compound.
Having listed the harsh androgenic nature and side effects associated with
methyltrienolone, it should come as no surpirse that women are not recommended
to use this compound. The usual virilizing effects such as deepening of the
voice, body/facial hair growth, and enlargement of the clitoris, among others
are likely to cause problems for female users. These effects can appear at even
relatively low doses as has been proven in animal studies (3). Methyltrienolone
is not a compound that women should attempt to administer.
Now due to the lack of estrogenic side effects associated with methyltrienolone
it would seem that users would have little to worry about in terms of side
effects like gynecomastia, water retention, etc. However one again like
trenbolone, methyltrienolone is a progestin, meaning that it has the ability to
bind to receptors of the female sex hormone progesterone (4). Also, like other
19-nor compounds methyltrienolone increases prolactin levels. Side effects
related to these reactions can include breast growth and lactation. The drug
also has the ability to help enhance any estrogenic side effects that may
results from aromatizing drugs that the user is administering concurrently. This
is obviously something to take into consideration when deciding what ancillary
drugs to use during a cycle that includes methyltrienolone. To prevent side
effects as they relate to increased prolactin levels a user can use several
compounds including bromocriptine, vitamin b6, and/or cabergoline. Letrozole can
also be used to lower progesterone levels.
Being a progestin, methyltrienolone also has a dramatic effect on usersï¿½ natural
testosterone production. Much in the same way that trenbolone and nandrolone do,
methyltrienolone can suppress the natural production of testosterone for an
extended period of time. For this reason it is advisable that users use
testosterone in conjunction with methyltrienolone even during short cycles if
they wish to avoid sexual dysfunction, libido problems, or mental side effects
associated with a lack of testosterone. There have been some animal studies that
have shown that methyltrienolone can actually increase libido in some cases (5),
but others have found the opposite effect to be true as well (6). As a
precautionary measure, testosterone supplementation may be a good protocol to
As stated earlier in this profile, methyltrienolone was deemed to be to
hepatoxic for commercial human use by the company that originally developed it.
As a 17 alpha alkylated steroid, it would be assumed that the drug would put an
additional strain on the liver of a user. However it seems that methyltrienolone
is one of the harsher steroids in terms of hepatoxicity. For this reason, it can
be expected that the liver values of a user will become elevated if he or she
uses methyltrienolone for any moderate period of time. In fact liver damage
could be a significant risk if doses or durations of cycling the drug range
outside of excepted standards of if the user has any liver abnormalities. For
this reason using other 17 alpha alkylated steroids at the same time as
methyltrienolone, or even relatively close to the same time as the drug, is
considered to a risk that one should not endeavour to take.
1. Sjogren J, Li M, Bjorntorp P. Androgen hormone binding to
adipose tissue in rats. Biochim Biophys Acta. 1995 May 11;1244(1):117-20.
2. Ho-Kim MA, Tremblay RR, Dube JY. Binding of methyltrienolone to
glucocorticoid receptors in rat muscle cytosol. Endocrinology. 1981
3. Lax ER, Baumann P, Schriefers H. Changes in the activities of microsomal
enzymes involved in hepatic steroid metabolism in the rat after administration
of androgenic, estrogenic, progestational, anabolic and catatoxic steroids.
Biochem Pharmacol. 1984 Apr 15;33(8):1235-41.
4Dube JY, Tremblay RR, Chapdelaine P. Binding of methyltrienolone to various
androgen-dependent and androgen-responsive tissues in four animal species. Horm
5. Sodersten P, Gustafsson JA. Activation of sexual behaviour in castrated rats
with the synthetic androgen 17 beta-hydroxy-17
alpha-methyl-estra-4,9,11-triene-3-one (R 1881). J Endocrinol. 1980
6.Baum MJ, Kingsbury PA, Erskine MS. Failure of the synthetic androgen 17
beta-hydroxy-17 alpha-methyl-estra-4,9,11-triene-3-one (methyltrienolone, R1881)
to duplicate the activational effect of testosterone on mating in castrated male
rats. J Endocrinol. 1987 Apr;113(1):15-20.
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