Halotestin: main features and side effects

Androgyny 850


Anabolic 1900


Standard  Methyltestosterone


Chemical Name  Fluor-9a-11b, 17b-dihydroxy-17a-methyl-4-androstene-3-one


Estrogenic activity  no


Activity Progestin  unknown (low)


Description Halotestin

Fluoxymesterone – Oral anabolic steroid derived from testosterone. More specifically, a derivative of methyltestosterone, characterized by adding and 11b-hydroxy-9-fluorene and groups. The result is a powerful orally active non-aromatizing steroid with strong androgenic activity. Fluoxymesterone much more androgenic than testosterone, at the same time, the anabolic properties are more moderate. This makes fluoxymesterone drug to increase strength, but not the most perfect anabolic. Fluoxymesterone significantly increases the strength, increases the density of the muscles, improves the drawing, but it adds a little amount of muscle.


Fluoxymesterone was first described in 1956. He experienced the same year, and it showed 20 times more anabolic activity than methyltestosterone. He came to the US market under the names Halotestin (available from Upjohn) and ultradren (from the company Ciba). The drug was originally described as halogen derivatives of testosterone, possessing 5 times greater potential than methyltestosterone. Previously, he was recommended for the treatment of burns, fractures, dystrophy, and to treat the effects of corticoid treatment. In the mid-1970s, drug control has been tightened, and fluoxymesterone were appointed only for the treatment of androgen deficiency and inoperable breast cancer. In recent years, doctors have formed a controversial opinion about fluoxymesterone. Now the emphasis is on safe products. Despite this, fluoxymesterone is sold under the name of Halotestin® from Pharmacia & Upjohn. Details

Form of product:

Fluoxymesterone available in some pharmacies. The composition and the dosage can vary depending on the country and the manufacturer, but this is usually 2 tablets of 2.5, 5, or 10mg.

Structural features:

Fluoxymesterone – a modified form of testosterone. It is characterized by 1) addition of a methyl group at the 17-alpha, which protects the drug from degradation when taken orally, 2) adding fluorene group at the 9-alpha, and 3) adding a hydroxyl group at the 11-beta that can block aromatization. The last two modifications seriously improve androgens and increase the relative biological activity of 17-methyltestosterone and.

Estrogenic side effects:

Fluoxymesterone aromatizing and has no estrogenic activity. Anti-estrogens are not needed, sensitive people will not feel the symptoms of gynecomastia. Normally, estrogen causes water retention, but the steroid growing quality mass without excess liquid. This makes it good for applications to the “drying”, when the main problem is the water retention and fat.

Androgenic side effects:

Fluoxymesterone classified as androgens and androgenic side effects are possible. This can be increased oiliness of the skin, acne, hair growth on the body and face. High doses are likely to cause them. Anabolic steroids can worsen hair loss male pattern. Women should be further aware of the potential effects of AAS virilizuyuschih. This may include deepening of the voice, irregular periods, change in skin texture, facial hair growth, and clitoral enlargement. Fluoxymesterone well fermented 5-alpha reductase. Most of its metabolites – the 5-alpha reduced. This means that the steroid is transformed into a more active substances into the skin, scalp and prostate. It is possible to reduce the relative androgenicity parallel use of finasteride or dutasteride. In studies of 1961, this steroid has shown that its use can increase the penis, enhance hair growth, libido. Fluoxymesterone has a slightly different profile of androgen compared to testosterone. Fluoxymesterone – androgen, but it is not complete biological equivalent of testosterone. Read more

Side Effects (Hepatotoxicity):

Fluoxymesterone – c17-alpha alkylated drug. This modification protects the drug from deactivation by the liver, allowing a large percentage of drugs enter the bloodstream after oral administration. Alkylated AAS can be hepatotoxic. Receiving a long time or at high doses can lead to liver damage. In rare cases may develop life-threatening dysfunction. It is advisable to periodically visit the doctor on a course to monitor liver function. Consumption alkylated AAS is usually limited to 6-8 weeks in order to avoid increasing the stress the liver. A study in which patients received 9 of calusterone 20mg daily for two nedl showed increased retention in the body sulfobromoftaleina (a marker of liver stress) in six of the nine patients. It may be advisable to use the course supplements, cleansing the liver, such as organ meats Stabia Liv-52 and Essentiale forte.

Side effects (cardiovascular system):

AAS can have a detrimental effect on blood cholesterol. This may be a decrease in the level of “good” HDL cholesterol, shifting the balance towards the risk of atherosclerosis. Relative impact AAS lipids depends on the dose, route of administration, the type and level of steroid resistance hepatic metabolism. Fluoxymesterone has a strong effect on the regulation of cholesterol by the liver due to its non-aromatizing structure, the structural resistance to decay and the mode of administration. AAS can have an adverse effect on blood pressure and triglycerides, reduce endothelial relaxation of blood vessels, trigger ventricular hypertrophy, potentially increasing the risk of cardiovascular disease and heart attack. To reduce the load on the cardiovascular system, it is recommended to minimize the consumption of saturated fat, cholesterol, and simple carbohydrates during the course AAS. We recommend the use of additives such as fish oil, lipid Stabil or similar products.

Suppression of testosterone:

All AAS doses needed to build muscle, suppress endogenous testosterone production. Without the intervention of testosterone-stimulating substances, testosterone levels return to normal within 1-4 months after the course. Note that in the long period hypogonadotrophic hypogonadism can develop into secondary and this may require medical intervention.


Studies have shown that use of oral AAS with food reduces the bioavailability of the drug. This is due to the AAS liposoluble nature that may allow some of the drug to dissolve in the fat from the food, which reduces the absorption of AAS in the gastrointestinal tract. To maximize the effect of this drug should be taken on an empty stomach. Read more

How to take Halotestin

Reception (for men):

For the treatment of androgen insufficiency it previously was administered in a dose of 2-10mg per day. Later I went to the appointment of 5-20mg a day. The therapy is usually started with 20mg and then reduce the dose to the patient needed. For sporting purposes it is used at a dose of 10-40mg per day courses of 6-8 weeks in order to avoid adverse effects on the liver. Because of its ability to increase strength without increasing weight it is popular wrestlers, powerlifters, boxers, etc. Fluoxymesterone also helps bodybuilders “be burnt,” the remnants of the fat on the “drying”. For weight gain it is combined with nandrolone or boldenone to precompetitive preparation of the preparation of its combined with Primobolan. To increase the weight it can be combined with testosterone enanthate (400mg per week).

Reception (for women):

Fluoxymesterone is not recommended for women for sporting purposes.

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