Medications that can lower your testosterone

How a medicine can lower testosterone

Testosterone production depends on a chain of signals. The hypothalamus releases GnRH, the pituitary responds with LH and FSH, and the testes make testosterone and sperm. A drug can interrupt that chain at any link, most often at the brain end. When that happens, doctors call it secondary or central hypogonadism.

The Endocrine Society's testosterone guideline groups these medications under functional causes of low testosterone, meaning the testes are capable of working normally once the suppressing factor is removed. That is good news, because it means a medication review can sometimes solve the problem without adding a new prescription.

Opioid pain medicines

Opioids are the most studied example. They act on receptors in the hypothalamus, reduce GnRH pulses and in turn lower LH and testosterone. A 2020 review in Cureus summarized studies reporting gonadal suppression in a wide range of long-term users, with higher doses and long-acting formulations carrying more risk.

In 2016, the FDA required opioid labels to warn that long-term use may be associated with decreased sex hormone levels. The agency noted that causation is not certain, because pain, stress and other medicines can also play a role. It advised patients to report low libido, erectile problems or infertility, and advised clinicians to order lab tests when those symptoms appear.

Glucocorticoid steroids

Oral or injected glucocorticoids, such as prednisone or dexamethasone, are used for asthma, arthritis, autoimmune disease and many other conditions. MedlinePlus lists them, along with opioids, as causes of central hypogonadism. The American Urological Association recommends considering a testosterone check in men on chronic corticosteroids even if they have no obvious symptoms.

Short courses rarely cause lasting problems. The concern is with long-term or repeated high-dose use. If you need steroids for a chronic condition, ask whether a steroid-sparing option is possible, but do not taper or stop them without guidance, because stopping abruptly can be dangerous.

Prostate cancer hormone therapy

Androgen deprivation therapy is designed to lower testosterone, because testosterone fuels most prostate cancers. According to the National Cancer Institute, this includes LHRH agonists such as leuprolide, LHRH antagonists such as degarelix and relugolix, and androgen synthesis inhibitors such as abiraterone.

In this setting, low testosterone is the intended effect, not a side effect to fix. Men on these treatments can still discuss bone health, muscle loss, hot flashes and sexual side effects with their oncology team, but testosterone replacement is generally not part of the plan.

Anabolic steroids, and stopping them

Taking testosterone or anabolic steroids from outside the body shuts down your own production. When they are stopped, natural output can stay low for months while the system restarts. MedlinePlus specifically names withdrawal from anabolic steroids as a cause of central hypogonadism.

If you have used performance-enhancing steroids, telling your clinician is important. It changes how results are interpreted and which treatments are appropriate, especially if you want to preserve fertility.

Other medicines and substances to mention

The Endocrine Society guideline also lists drugs that block androgen synthesis, along with heavy alcohol and marijuana use, as contributors to low testosterone. Ketoconazole, an antifungal that the National Cancer Institute notes can block the enzyme needed to make testosterone, is one example. Bring a full list to your visit, including:

• Pain relievers, including any opioid patches, pills or injections
• Steroid pills, injections, and high-dose inhaled steroids
• Antifungals, cancer treatments and hormone-blocking drugs
• Any testosterone, anabolic steroids or SARMs, past or present
• Alcohol and cannabis use, honestly estimated
• Supplements, especially products marketed as testosterone boosters

Testing while on a suppressing medicine

Guidelines recommend against testing for testosterone deficiency during an acute illness or a short course of a drug that suppresses testosterone, because the result will not reflect your usual state. For ongoing medications, a clinician may still test, using two early-morning samples, and interpret the result in context.

If testosterone is confirmed low and the medicine cannot be changed, treatment is sometimes still reasonable. That decision weighs symptoms, fertility plans, hematocrit, prostate health and your other conditions.

A practical plan if you suspect a medication

Start by writing down when your symptoms began and what changed around that time, such as a new prescription, a dose increase or an injury that led to pain medicine. That timeline is often more revealing than a single lab value.

Next, share the list with both the clinician evaluating your hormones and the clinician who prescribes the suspect medicine. Sometimes the fix is a different drug, a lower dose or a non-opioid pain plan. Sometimes the medicine is essential, and the goal becomes managing the hormonal side effect safely instead. Either way, decisions work best when everyone involved can see the whole picture.

When to speak up quickly

Contact your prescriber if you notice a sharp drop in libido, new erectile problems, breast tenderness or swelling, or hot flashes after starting a new medicine. Severe headaches or vision changes alongside low testosterone need prompt evaluation for a pituitary problem.