What Is Depo-Testosterone? Uses, Dosage, and What You Need to Know in 2026

Depo-Testosterone is one of the most commonly prescribed medications for testosterone replacement therapy (TRT) in the United States. Whether you've just been handed a prescription or you're researching your options before your next appointment, this guide gives you a complete picture — from what it is and what it treats, to dosing, who should avoid it, and what to expect.

What Is Depo-Testosterone?

Depo-Testosterone is the brand name for testosterone cypionate injection, manufactured by Pfizer. It is an androgen — a synthetic form of testosterone, the primary male sex hormone. Testosterone cypionate is an ester of testosterone, meaning a chemical modification has been made to extend how long it stays active in your body after injection.

It comes as an injectable solution — available in two strengths, 100 mg/mL and 200 mg/mL — and is given by intramuscular injection, typically into the gluteal muscle (buttocks). Generic versions are manufactured by companies like Hikma, Sun Pharma, Teva, and others, and are therapeutically equivalent to the brand-name product.

What Is Depo-Testosterone Used For?

The FDA has approved Depo-Testosterone for two primary indications in males:

1. Primary hypogonadism (congenital or acquired) — Testicular failure due to conditions such as cryptorchidism, bilateral torsion, orchitis, or orchidectomy.
2. Hypogonadotropic hypogonadism (congenital or acquired) — Low testosterone resulting from problems with the hypothalamus or pituitary gland, including gonadotropin or LHRH deficiency or pituitary-hypothalamic injury from tumors, trauma, or radiation.

In plain language, these are conditions where your body does not produce enough testosterone on its own. Symptoms of low testosterone include fatigue, low libido, erectile dysfunction, mood changes, decreased muscle mass, increased body fat, and difficulty concentrating.

Depo-Testosterone is also used off-label for:

• Delayed puberty in adolescent boys (certain injectable testosterone products)
• Gender-affirming hormone therapy for transgender men
• Certain breast cancer cases in women

How Is Depo-Testosterone Given?

Depo-Testosterone is given as a deep intramuscular injection, typically into the gluteal muscle (buttocks). It is not for intravenous use. Some patients receive their injection at a doctor's office or clinic, while others are trained to self-administer at home after proper instruction from their healthcare provider.

The injection is given in cottonseed oil, which slows absorption from the muscle and extends the duration of action. This is what allows it to work for one to four weeks between doses — unlike unmodified testosterone, which would need to be injected multiple times per day to maintain stable levels.

Depo-Testosterone Dosage Information

The appropriate dose of Depo-Testosterone varies significantly depending on your age, diagnosis, baseline testosterone levels, and how you respond to treatment. Always follow your prescriber's instructions — these are general ranges, not recommendations.

• Typical adult male dose: 50–400 mg injected into a muscle every 2 to 4 weeks. A common starting dose is 100–200 mg every 2 weeks.
• Maximum dose: 400 mg injected into a muscle every 2 weeks.
• Weekly injections: Some providers prescribe smaller weekly doses (e.g., 100 mg/week) to maintain more stable hormone levels and reduce the "peaks and troughs" effect that comes with larger, less frequent injections.

The Endocrine Society recommends targeting serum testosterone levels of 400–700 ng/dL on therapy, with levels typically checked about one week after a dose of testosterone cypionate.

Who Should Not Take Depo-Testosterone?

Depo-Testosterone is not appropriate for everyone. Your doctor should not prescribe it if you have:

• Prostate or breast cancer (or if cancer is suspected)
• Serious heart, liver, or kidney disease
• Uncontrolled high blood pressure
• Polycythemia (too many red blood cells)
• Pregnancy — testosterone is known to cause serious harm to a developing fetus
• Known hypersensitivity to testosterone cypionate or its components (including cottonseed oil or benzyl alcohol)

Use with caution if you have sleep apnea, obesity, diabetes, liver disease, or a history of blood clots. These conditions may increase your risk of complications on TRT.

How Long Before Depo-Testosterone Works?

Testosterone cypionate doesn't produce effects overnight. Here's a rough timeline of when different benefits tend to appear:

• Libido improvements: 3–6 weeks
• Energy and mood improvements: 3–6 weeks
• Erection quality improvements: 3–6 months
• Muscle mass and strength gains: 3–6 months (with exercise)
• Body fat reduction: 3–6 months (with exercise and diet)
• Bone density improvements: 6+ months

Brand vs. Generic: Does It Matter?

Generic testosterone cypionate is therapeutically equivalent to brand-name Depo-Testosterone. The FDA requires generics to have the same active ingredient, strength, and route of administration as the brand. For most patients, generic versions work equally well and cost significantly less. Most pharmacies stock generic versions from manufacturers like Hikma, Sun Pharma, or Teva rather than the Pfizer brand.

The Bottom Line

Depo-Testosterone is a well-established and effective treatment for clinically low testosterone when prescribed and monitored properly. Understanding what it is, how it works, and what to expect helps you have a more productive conversation with your doctor — and sets realistic expectations for your treatment. If you're ready to fill your prescription, use Medfinder to find a pharmacy with it in stock near you, or read our guide on how to find Depo-Testosterone in stock for more strategies.