Side Effects of Testosterone

Testosterone is a sex hormone that is produced in male testicles.

Testosterone is also produced in small amounts in woman’s ovaries and adrenal system.

Testosterone is used in men and boys to treat conditions caused by a lack of this hormone, such as delayed puberty, impotence, or other hormonal imbalances. It is also used in women to treat breast cancer that has spread to other parts of the body.

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Call your doctor at once if you have any of these serious side effects:

  • swelling, rapid weight gain;
  • increased or ongoing erection of the penis;
  • bone pain, increased thirst, memory problems, restless feeling, confusion, nausea, loss of appetite, increased urination, weakness, muscle twitching; or
  • nausea, vomiting, stomach pain, loss of appetite, and jaundice (yellowing of the skin or eyes).

Women receiving may develop male characteristics, which could be irreversible if testosterone treatment is continued. Call your doctor as soon as possible if you notice any of these signs of excess testosterone:

  • acne;
  • changes in your menstrual periods;
  • male-pattern hair growth (such as on the chin or chest);
  • male pattern baldness;
  • enlarged clitoris; or
  • increase or decrease in sex drive.

Less serious testosterone side effects may include:

  • breast swelling in men;
  • headache, anxiety, depressed mood;
  • numbness or tingly feeling; or
  • pain or swelling where the medicine was injected.

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect.

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