Testosterone injections deliver the hormone into muscle, where it is released gradually into your bloodstream. They are one of several ways clinicians treat confirmed low testosterone in men. Here is how injections work, how low testosterone is diagnosed, and what to expect from follow-up care with a licensed clinician, so you can ask informed questions from the start.
How Low Testosterone Is Diagnosed
Treatment begins with a diagnosis. Cleveland Clinic explains that symptoms vary and may include low libido, loss of morning erections, reduced muscle strength, more body fat, depressed mood, and trouble concentrating. Clinicians consider total testosterone below 300 ng/dL low in adults, and low levels plus symptoms define male hypogonadism. Diagnosis usually involves two separate morning blood samples, when levels are highest, plus tests such as luteinizing hormone and prolactin to look for a pituitary cause. Nutritious eating and regular physical activity are first steps, and other treatment may be considered if symptoms continue or are severe. A clear diagnosis is the foundation for every decision that follows.
How Testosterone Injections Deliver the Hormone
Injections place testosterone into muscle, where it is absorbed gradually. Cleveland Clinic lists injections given into a muscle every 1 to 2 weeks, or long-acting injections every 10 weeks, and notes they can also be given under the skin. For testosterone cypionate, the Pfizer label states that it is injected deep into a muscle, that the oil it is dissolved in slows absorption, and that it can be given at intervals of two to four weeks. The label gives a half-life of about eight days. Your clinician chooses the product and schedule that suit your labs and lifestyle. Other options include gels, pellets, and nasal gel.
Follow-Up Care on Testosterone Therapy
Good care continues after the first injection. Cleveland Clinic says patients on hormone replacement therapy need regular follow-up, typically once or twice a year, and suggests asking how often testosterone should be rechecked and what monitoring is needed. Follow-up visits give you a chance to share how you feel, review lab results, and adjust the plan with your clinician. Cleveland Clinic also advises seeing a provider instead of turning to over-the-counter supplements for bothersome symptoms. Questions worth bringing to each visit include the following, and writing them down beforehand helps you make the most of your time:
- How often should my testosterone be rechecked?
- Which labs will we monitor over time?
- What should I track between visits?
Frequently Asked Questions
How Are Testosterone Injections Given?
Testosterone cypionate is injected deep into a muscle, according to its label. Cleveland Clinic notes testosterone injections can also be given under the skin. Your clinician explains the route for your product.
How Often Are Testosterone Injections Given?
Cleveland Clinic lists injections every 1 to 2 weeks or long-acting injections every 10 weeks, and the cypionate label notes intervals of two to four weeks. Your clinician sets your schedule.
Are Injections the Only Way to Take Testosterone?
No. Cleveland Clinic lists daily skin gel, pellets implanted every 3 to 6 months, nasal gel, and oral testosterone for specific conditions. A clinician helps you weigh the options.
What Tests Come Before Starting Testosterone?
Clinicians usually order two separate morning blood tests for total testosterone, plus tests such as luteinizing hormone and prolactin to look for the cause, according to Cleveland Clinic.
Good to Know
Common side effects include acne, fluid retention, headache, breast enlargement, and pain at the injection site. FDA class-wide labeling changes in 2025 confirm that all testosterone products can raise blood pressure and add results from the TRAVERSE trial, which concluded there was no increase in adverse cardiovascular outcomes in men using testosterone for hypogonadism.
Talk to a Licensed Clinician About Testosterone
If you are curious whether testosterone care could fit, a licensed clinician can help you decide. Complete an online assessment, have an independent licensed clinician review your health history, and, when a prescription is appropriate, receive your medication from a licensed pharmacy that delivers to your door.
This article is for education only and is not medical advice.
