Testosterone contains Testosterone, a synthetic form of the naturally occurring male sex hormone. It is a prescription medicine used in men to treat conditions caused by a lack of natural testosterone, such as primary hypogonadism or hypogonadotropic hypogonadism. Testosterone should only be used under a doctor's supervision after blood tests have confirmed a low testosterone level.

Testosterone contains Testosterone, the primary male sex hormone and an anabolic androgenic steroid. Testosterone is naturally produced in the testes and plays a key role in the development and maintenance of male sexual characteristics, muscle mass, bone strength, and reproductive function. The medicinal form is synthetic and prescribed to restore or supplement hormone levels when the body cannot produce adequate amounts.

This medicine is commonly used in the treatment of male hypogonadism, a condition where testosterone levels are abnormally low due to medical causes such as testicular or pituitary disorders. It helps relieve symptoms including fatigue, reduced libido, mood changes, and loss of muscle strength. In adolescent boys, testosterone may be prescribed to manage delayed puberty, supporting the development of secondary sexual characteristics such as voice deepening, hair growth, and muscle development.

In addition to male indications, testosterone can be used in select cases for hormone‑responsive breast cancer in women, where it may help slow disease progression. It is also an important component of gender‑affirming hormone therapy for transgender men, promoting masculinization and the development of male physical traits.

Testosterone is available in several dosage forms, including oral capsules, topical gels, transdermal patches, and injectable depot preparations. The choice of formulation depends on individual patient needs and clinical judgment. Because testosterone is classified as a Schedule III controlled substance, its use requires careful medical supervision to ensure safety and prevent misuse.

This medicine is typically prescribed under medical supervision for the following conditions:

Male Hypogonadism

Treatment of low testosterone levels due to medical causes such as testicular, pituitary, or hypothalamic disorders. It helps restore normal hormone levels and alleviate symptoms like fatigue, reduced libido, and muscle loss.

Delayed Puberty in Males

Used in adolescent boys with delayed puberty to stimulate the development of secondary sexual characteristics such as voice deepening, muscle growth, and hair distribution.

Certain Types of Breast Cancer in Women

May be prescribed in select cases to slow the progression of hormone‑responsive breast cancer.

Gender‑Affirming Hormone Therapy

Administered to transgender men as part of masculinising hormone therapy, supporting the development of male secondary sexual characteristics.

Symptom Relief

Improves low sex drive, fatigue, depressed mood, and loss of bone or muscle mass associated with low testosterone.

Hormone Balance

Restores testosterone levels to the normal range, promoting healthy male physical traits and metabolic function.

Testosterone may cause side effects.

Common side effects may include:

• Acne or oily skin

• Swelling or pain at the application or injection site

• Increased prostate-specific antigen (PSA) levels

• Mood swings, nervousness, or irritability

• Increased red blood cell count

Uncommon side effects may include:

• Frequent or prolonged erections

• Breast swelling or tenderness

• Sleep apnea (breathing stops repeatedly during sleep)

Stop using Testosterone and call your doctor at once if you have:

• Swelling in your ankles or feet, or rapid weight gain.

• Difficulty urinating or a weak urine stream.

• Chest pain, shortness of breath, or sudden pain in your leg.

• Liver problems: nausea, upper stomach pain, dark urine, or yellowing of your skin or eyes.

• Signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

• Take or apply this medicine exactly as prescribed by your doctor. Follow all directions on your prescription label.

• For topical gels or solutions, apply only to clean, dry skin on the specific areas directed by your doctor (usually the shoulders, upper arms, or abdomen). Never apply to the genitals.

• For oral capsules, take with food as directed to help with absorption. Do not crush or chew.

• Your doctor will perform regular blood tests to measure your testosterone levels and ensure your dose is correct.

Testosterone provides exogenous testosterone, which binds to specific androgen receptors in target tissues. This complex promotes the transcription of genes responsible for the growth, development, and maintenance of male reproductive organs and secondary sex characteristics.

• If you are using a topical gel, let it dry completely before putting on clothes or allowing skin-to-skin contact with another person.

• Inform any doctor, dentist, or lab technician treating you that you are on testosterone replacement therapy.

• Do not share this medicine with anyone else, even if they have the same symptoms you do.

Store at room temperature away from moisture, light, and heat. Do not freeze. Keep all drugs out of the reach of children and pets.

• Food: Some oral testosterone capsules require food for proper absorption. Follow the specific instructions provided with your prescription.

Tell your doctor about all your other medicines, especially:

• Insulin or oral diabetes medicines: Testosterone may decrease your blood glucose and reduce your insulin requirements.

• Blood thinners: Such as warfarin. Testosterone can increase the effects of blood thinners, increasing the risk of bleeding.

• Corticosteroids: Taking these with testosterone may increase your risk of fluid retention and swelling.

Tell your doctor if you have ever had:

• Prostate cancer or breast cancer (in men)

• Severe heart, liver, or kidney disease.

• High cholesterol or triglycerides.

• Sleep apnea.

• High red blood cell count (erythrocytosis).

The dose of Testosterone is highly individualised and depends on the specific formulation being used and your target blood testosterone levels. Your doctor will adjust your dose based on periodic laboratory tests. Always follow the precise dosing instructions provided by your physician.

Symptoms of an acute overdose are unlikely with topical or delayed-release formats. However, long-term excessive use can lead to side effects affecting the liver or red blood cell count. If an overdose is suspected, seek medical advice or contact the Poison Help line.

This medicine works best when used on a regular schedule as prescribed. If you miss a dose, take or apply it as soon as you remember. If it is almost time for your next dose, skip the missed dose. Do not use extra medicine to make up a missed dose.