Low Testosterone Treatment: Medications, TRT & Fertility Considerations

Low testosterone, also called hypogonadism, can cause symptoms such as reduced sex drive, erectile difficulties, fatigue, reduced muscle mass, and changes in mood. Treatment depends on the underlying cause, the severity of symptoms, testosterone levels, overall health, and whether the man wants to have children.

In some men, the underlying problem can be addressed without testosterone replacement — for example, by managing obesity, certain medications, sleep-related conditions, hormonal disorders, or other medical problems. When a man has confirmed hypogonadism and persistent symptoms, testosterone replacement therapy (TRT) may be considered if there are no contraindications. However, for men who want to preserve fertility, standard TRT may not be the best option, because testosterone taken from outside the body can suppress the hormones needed for sperm production — this should be discussed with a urologist, andrologist, or reproductive specialist before starting treatment.

TRT is available in several forms, and the choice depends on convenience, cost, treatment goals, side effects, and medical history. Topical gels or solutions are applied daily to the skin and can provide relatively consistent testosterone levels, but require precautions to prevent transfer to another person through skin contact. Injections are given into a muscle or, depending on the formulation, under the skin — convenient and effective, though some formulations can produce fluctuations in testosterone levels.

Implantable pellets are inserted under the skin during an office procedure and provide longer-term delivery, but require a minor procedure for insertion and removal. Transdermal patches are convenient for some patients but can cause skin irritation. The appropriate formulation should be selected together with a healthcare professional rather than based solely on convenience.

One of the most important things to understand before starting TRT is that testosterone replacement can substantially reduce sperm production. Normally, the brain and pituitary gland communicate with the testes through luteinizing hormone (LH) and follicle-stimulating hormone (FSH): LH stimulates the Leydig cells in the testes to produce testosterone, while FSH, together with high concentrations of testosterone within the testes, supports normal sperm production.

When testosterone is taken from outside the body, the brain detects the increased androgen level and reduces the hormonal signals that stimulate the testes. The resulting decrease in LH and FSH can lower intratesticular testosterone, which is essential for spermatogenesis. Depending on the individual, dose, and duration of treatment, TRT can lead to a very low sperm count or azoospermia. Some men continue producing sperm while taking TRT, but sperm production can become severely reduced or stop altogether, which is why TRT should generally not be used as a fertility treatment in men who are actively trying to conceive. That said, TRT should not be used as a contraceptive — the degree of sperm suppression varies between men, and some continue producing enough sperm for pregnancy to occur.

Men who have low testosterone and want to preserve or restore fertility may be considered for treatments that stimulate the body’s own testosterone production or directly support sperm production; the appropriate medication depends heavily on the underlying cause of hypogonadism. Human chorionic gonadotropin (hCG) acts similarly to LH and can stimulate the Leydig cells in the testes to produce testosterone; it may be used in selected men with hypogonadotropic hypogonadism and can form part of fertility-treatment protocols, though whether it is sufficient to restore sperm production depends on the underlying hormonal problem.

Selective estrogen receptor modulators (SERMs), such as clomiphene citrate and enclomiphene, can increase the body’s production of LH and FSH by altering estrogen feedback at the level of the hypothalamus and pituitary gland, which may increase natural testosterone production while maintaining the hormonal signals needed for sperm production; some SERMs are used off-label in men with testosterone deficiency, particularly when preservation of fertility is important, but they are not appropriate for every cause and should only be used under medical supervision. FSH or human menopausal gonadotropin (hMG) therapy directly stimulates the cells within the testes involved in sperm production and is particularly relevant when a man has hypogonadotropic hypogonadism; it is often used together with hCG to provide both the testosterone-producing and sperm-supporting hormonal signals needed for spermatogenesis. Treatment should be individualized by a fertility specialist.

Not every man with low testosterone needs lifelong testosterone replacement — the first step is identifying the underlying cause. Factors that may contribute to low testosterone include obesity or significant excess body weight, certain medications, sleep disorders, chronic illnesses, hormonal disorders, pituitary or testicular conditions, excessive alcohol consumption, and anabolic steroid use. Treating an underlying problem may improve testosterone levels in some men.

Lifestyle changes are not a replacement for medical treatment when clinically significant hypogonadism is present, but they can support overall metabolic, hormonal, and reproductive health: maintaining a healthy weight (weight management may improve testosterone levels, particularly in men who are overweight or obese), exercising regularly, especially resistance training (temporary increases in testosterone immediately after exercise do not necessarily translate into a long-term effect), prioritizing adequate, consistent sleep of approximately 7–9 hours, limiting excessive alcohol and avoiding anabolic steroids, and managing chronic health conditions such as obesity and diabetes.

Usually, sperm suppression caused by TRT is reversible, but recovery is not guaranteed to occur quickly or completely in every man. After testosterone therapy is stopped, the hypothalamic-pituitary-testicular axis may gradually recover and sperm production can return. However, the time required varies considerably — some men recover within several months, while others may require longer and may benefit from fertility-directed treatment. Recovery can depend on factors such as the duration of testosterone use, dose and formulation, age, baseline sperm production, underlying fertility problems, whether anabolic steroids were also used, and individual hormonal recovery.

Men who want to restore fertility after TRT should be evaluated by a fertility specialist rather than simply waiting for sperm production to return. In selected men, hCG-based treatment may be used to stimulate testosterone production within the testes; additional medications, including FSH, may be considered when sperm production needs further stimulation. Treatment depends on hormone levels, semen-analysis results, the underlying cause of infertility, and whether the couple is actively trying to conceive.

The timing of improvement depends on the symptom and the individual: some men may notice changes in sexual desire within several weeks, while improvements in body composition, muscle mass, and bone health generally take longer. Testosterone levels are monitored through blood tests, and treatment may need to be adjusted according to symptoms, laboratory results, and potential adverse effects. TRT is not simply about reaching a particular testosterone number — the goal is to treat appropriately diagnosed hypogonadism while monitoring the patient’s response and safety.

Men receiving TRT generally require medical follow-up, which may include monitoring testosterone levels, symptoms and clinical response, hematocrit and hemoglobin, blood pressure and cardiovascular risk factors, prostate-related evaluation when appropriate, and adverse effects and treatment tolerance. The specific monitoring schedule should be determined by the prescribing clinician.

Does TRT lower sperm count? Yes. Exogenous testosterone can suppress LH and FSH, reducing intratesticular testosterone and sperm production; in some men this can lead to very low sperm counts or azoospermia.

Can I take TRT if I want to have children? TRT is generally not the preferred treatment for men who are actively trying to conceive because it can suppress sperm production — tell your doctor about your fertility plans before starting testosterone therapy.

Is TRT a form of male birth control? No. The degree of sperm suppression varies between men, and some continue producing enough sperm for pregnancy to occur, so TRT should not be used as a contraceptive.

Should I have a semen analysis before starting TRT? If future fertility is important to you, discussing fertility evaluation before starting TRT is reasonable — a baseline semen analysis provides useful information about current sperm production and can help guide future fertility planning.

Can lifestyle changes increase testosterone? Yes, maintaining a healthy weight, exercising regularly, getting adequate sleep, limiting excessive alcohol, and managing chronic health conditions may support testosterone levels, though lifestyle changes alone may not correct clinically significant hypogonadism caused by testicular, pituitary, or other medical conditions.