Fluoxymesterone (Halotestin) – Everthing To Know

Fluoxymesterone is a highly potent anabolic-androgenic steroid that entered the market in the late 1950s. It was originally introduced by Upjohn under the name Halotestin, while Ciba Pharmaceuticals marketed it as Ultandren. Over time, Halotestin became the name most commonly associated with the compound, and it continues to be produced under that label.

When first developed, Halotestin was promoted for a wide range of medical applications. Doctors prescribed it for muscle wasting disorders, androgen deficiency in men, tissue repair, malnutrition, and even to support bone fracture recovery. It was also used in cases involving long-term cortisone therapy, paraplegia, breast cancer treatment, and severe burns.

Unlike many anabolic steroids, it was prescribed to both men and women. Today, medical use is far less common, though it still appears in specific breast cancer treatments and rare cases of androgen deficiency. Some postmenopausal women may also receive it for osteoporosis. Buy Sixpex Products Online

In performance enhancement circles, Halotestin has built a reputation as one of the most intense and fast-acting steroids available. However, it is not widely used. Despite its extremely high anabolic rating on paper, it contributes very little to actual muscle mass gain. Instead, it is known primarily for dramatic strength increases.

Some competitive bodybuilders include it in the final weeks before a show to enhance hardness and conditioning while helping them push through the final stages of a strict diet. Still, its harsh side effect profile keeps many users away.

Halotestin Function & Traits

Fluoxymesterone is a modified testosterone derivative, specifically an altered form of methyltestosterone.

• 17-alpha methyl group allows oral use

• Fluoro groups at carbon 9 and 3

• Hydroxyl group at carbon 11

• Does not aromatize into estrogen

• Extremely strong androgenic activity

On paper, Halotestin carries an anabolic rating of 1900 and an androgenic rating of 850 (with testosterone rated at 100 in both categories). However, these numbers are misleading. In real-world human use, the anabolic (muscle-building) effect is minimal. Its impact comes primarily from androgenic activity.

One of its strongest effects is on red blood cell production:

• Increases hematocrit and hemoglobin

• Expands red blood cell count

• Enhances oxygen delivery

• Boosts energy and performance

This explains the significant strength gains users often report.

Halotestin also supports fat loss by:

• Increasing fatty acid oxidation in the liver

• Enhancing fast-twitch muscle mitochondrial activity

• Improving visual hardness in already lean individuals

However, these conditioning benefits are most noticeable only in those who are already extremely lean.

Effects of Halotestin

Halotestin is powerful but very specialized. It is not a general-purpose steroid.

Primary performance effects:

• Significant strength increases

• Heightened aggression and intensity

• Improved competitive drive

Aggression is often exaggerated in discussions about steroids, but Halotestin can noticeably amplify assertiveness. It does not change personality or moral judgment, but it can intensify one’s natural disposition. For disciplined athletes, this can translate into better training sessions or competition performance. For naturally aggressive individuals, it may amplify negative traits.

Because of this strength and aggression boost, Halotestin is commonly used short-term by:

• Powerlifters

• Strength athletes

• Combat sports competitors

Bodybuilders may use it during the final weeks before competition to:

• Push through extreme calorie deficits

• Maintain training intensity

• Achieve a harder, sharper look

However, these visual benefits only appear at very low body fat levels. Most recreational users would see little practical benefit.

Important limitations:

• Not a mass-building steroid

• Not suitable as a base compound in a cycle

• Best suited for short-term strategic use

Side Effects of Halotestin

Halotestin is not the most dangerous steroid available, but it is far from mild. Its liver toxicity and cardiovascular strain make it unsuitable for many users.

Estrogenic

• Does not convert to estrogen

• No water retention

• No gynecomastia risk

• Anti-estrogens not needed (unless other compounds require them)

Androgenic

• High risk of acne

• Accelerated hair loss in genetically prone users

• Increased body hair growth

• Strong virilization risk in women

It interacts heavily with the 5-alpha reductase enzyme. Medications like finasteride may slightly reduce androgenic effects, but not eliminate them.

For women, virilization risk is extremely high:

• Deepened voice

• Body hair growth

• Clitoral enlargement

Because of this, it has no place in female performance enhancement. Its only potential female use is in certain breast cancer treatments.

Cardiovascular

• Raises LDL (bad cholesterol)

• Suppresses HDL (good cholesterol)

• May increase blood pressure

• Can negatively affect triglycerides

• Possible long-term heart strain

Anyone considering use must:

• Have healthy cholesterol and blood pressure levels

• Follow a heart-friendly diet

• Limit saturated fats and sugars

• Include omega fatty acids

• Perform regular cardiovascular exercise

• Consider cholesterol-support supplements

Long-term use significantly increases cardiovascular risk.

Testosterone Suppression

• Causes strong natural testosterone shutdown

• Requires exogenous testosterone during use

• Risk of low testosterone symptoms without support

After discontinuation:

• Natural production eventually returns

• Recovery may take several months

• Post Cycle Therapy (PCT) is strongly recommended

• PCT speeds hormonal recovery but does not instantly normalize levels

Hepatotoxicity

Halotestin is a C17-alpha alkylated oral steroid, meaning it is liver toxic.

• Liver enzyme levels will rise

• Significant liver stress is likely

• Higher toxicity compared to many oral steroids

Safety precautions include:

• Limiting use to 2–4 weeks

• Using liver support supplements

• Avoiding alcohol completely

• Minimizing OTC medication use

• Starting only with healthy liver function

Short-term use is strongly advised due to its high liver strain.