Testosterone undecanoate is a male sex hormone. It works by replacing or supplementing the testosterone that is naturally made in the body. FDA approved testosterone undecanoate is a long-acting man-made version of testosterone, the natural male sexual hormone. Testosterone is responsible for the normal growth and development of male sex organs and characteristics. It includes growth and development of male organs of penis, testicles, prostate, body hair, vocal cord thickening, and muscle and fat distribution.
Testosterone undecanoate is used for treating symptoms of low testosterone in men when the body does not make any testosterone or not enough testosterone (hypogonadism). It may also be used for other conditions as determined by your doctor.
Do NOT use testosterone undecanoate if
you are allergic to any ingredient in testosterone undecanoate
you are pregnant, planning to become pregnant, or are breast-feeding
you have breast cancer or known or suspected prostate cancer
Before using testosterone undecanoate
Some medical conditions may interact with testosterone undecanoate. Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:
if you are pregnant, planning to become pregnant, or are breast-feeding
if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
if you have allergies to medicines, foods, or other substances
if you have heart problems (eg, heart failure), kidney or liver problems, an enlarged prostate gland, high cholesterol levels, swelling (edema) or problems retaining fluid, lung problems, cancer, high blood calcium levels, diabetes, or sleep apnea (long pauses in breathing while you sleep)
if you are very overweight
if you have a history of blood clots
Possible side effects of testosterone Undecanoate that you should look out for
All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:
Acne; change in sex drive; emotional ups and downs; pain at the injection site; tiredness; trouble sleeping.
Seek medical attention right away if any of these SEVERE side effects occur
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); change in the size or shape of the testicles; changes in skin color; decreased sex ability; enlarged or painful breasts; erections that happen often or that last a long time; long pauses in breathing while you sleep; mood changes; swelling of the hands, ankles, or feet; symptoms of blood clots (eg, calf or leg pain, swelling, redness, or tenderness; chest pain; coughing up blood; shortness of breath); symptoms of liver problems (eg, dark urine; loss of appetite; pale stools; right-sided stomach pain; unusual nausea, vomiting, or tiredness; yellowing of the skin or eyes); urination problems (eg, feeling the need to pass urine right away, having a urine accident, passing urine more at night, passing urine often during the day, trouble starting the urine stream, weak urine stream); weight gain.