Methyltestosterone is a man-made form of testosterone, a naturally occurring sex hormone that is produced in a man's testicles. Small amounts of testosterone are also produced in a woman's ovaries and adrenal system.
Methyltestosterone is used in men and boys to treat conditions caused by a lack of this hormone, such as delayed puberty or other hormonal imbalances. Methyltestosterone is also used in women to treat breast cancer that has spread to other parts of the body.
Methyltestosterone may also be used for purposes not listed in this medication guide.
You should not use methyltestosterone if you are allergic to it, or if you have:
prostate cancer; male breast cancer; or if you are pregnant or may become pregnant.
To make sure methyltestosterone is safe for you, tell your doctor if you have:
an enlarged prostate;
breast cancer;
heart disease, congestive heart failure;
liver or kidney disease; or
if you take a blood thinner (warfarin, Coumadin, Jantoven).
FDA pregnancy category X. This medicine can harm an unborn baby or cause birth defects. Do not use methyltestosterone if you are pregnant. Tell your doctor right away if you become pregnant during treatment. Use effective birth control while you are using methyltestosterone.
It is not known whether methyltestosterone passes into breast milk or if it could harm a nursing baby. You should not breast-feed while using this medicine.
How should I take methyltestosterone?
Follow all directions on your prescription label. Your doctor may occasionally change your dose to make sure you get the best results. Do not take this medicine in larger or smaller amounts or for longer than recommended.
While using methyltestosterone, you may need frequent blood tests.
Methyltestosterone can affect bone growth in boys who are treated for delayed puberty. Bone development may need to be checked with x-rays every 6 months during treatment.
Store at room temperature away from moisture and heat.