Halobol (Fluoxymesterone – Halotestin)


Manufacturer: Alpha Pharma
Category: Oral
Substance: Fluoxymesterone (Halotestin)
Package: 5mg (50 pills)


 uses generic names in all descriptions of drugs. Halotestin is the trade name for fluoxymesterone. In some cases, health care professionals may use the trade name halotestin when referring to the generic drug name fluoxymesterone.

Drug type:  Fluoxymesterone is a hormone therapy.  This medication is classified as an “androgen.”  (For more detail, see “How this drug works” section below).

What this drug is used for:

Fluoxymesterone is used to treat breast cancer.  It is a palliative treatment for recurrent estrogen-receptor positive breast cancer.
Note:  If a drug has been approved for one use, physicians may elect to use this same drug for other problems if they believe it may be helpful.

How this drug is given:

Fluoxymesterone is a pill, taken by mouth.
The amount of fluoxymesterone that you will -eceive depends on many factors, including your height and weight, your general health or other health problems, and the type of cancer or condition being treated.  Your doctor will determine your dose and schedule.
Side effects:
Important things to remember about the side effects of fluoxymesterone:

Most people do not experience all of the side effects listed.
Side effects are often predictable in terms of their onset and duration.
Side effects are almost always reversible and will go away after treatment is complete.
There are many options to help minimize or prevent side effects.
There is no relationship between the presence or severity of side effects and the effectiveness of the medication.
The side effects of fluoxymesterone and their severity depend on how much of the drug is given.  In other words, high doses may produce more severe side effects.
The following side effects are common (occurring in greater than 30%) for patients taking fluoxymesterone:

Absence of menstrual periods (amenorrhea) (see menopause)
Deepening of voice
Clitoral enlargement (may be irreversible)
Swelling of face, hands or feet
Acne (see skin reactions)
Loss of fertility.  Meaning, your ability to conceive or father a child may be affected by fluoxymesterone.  Discuss this issue with your health care provider.
These side effects are less common side effects (occurring in about 10-29%) of patients receiving fluoxymesterone:

Facial hair growth (on women)
Increased appetite/weight gain
Temporary decrease in thyroid hormone T4 (thyroxine).  Thyroid function does not appear to be affected.  (see blood test abnormalities.
Increased or decreased libido (see sexuality).
A rare, but potentially serious side effect of fluoxymesterone is the development of hepatic adenomas (liver tumors), hepatocellular cancer (liver cancer) or other liver problems.  This can occur after long-term use.
Your fertility, meaning your ability to conceive or father a child, may be affected by fluoxymesterone.  Please discuss this issue with your health care provider.

Not all side effects are listed above. Some that are rare (occurring in less than 10% of patients) are not listed here.  However, you should always inform your health care provider if you experience any unusual symptoms.