Many drugs change testosterone levels in the human body, some by design and others as a side effect. These range from direct testosterone replacement to medications that trick the brain into producing more of it naturally, to common prescriptions like opioids and cholesterol-lowering drugs that suppress it unintentionally. Understanding which drugs do what, and how, can help you make sense of lab results, treatment options, or unexpected symptoms.
Testosterone Replacement Therapy
The most direct way to raise testosterone is to put it into the body. Testosterone replacement therapy (TRT) is prescribed when blood levels fall below 300 ng/dL on at least two separate early-morning tests, the threshold set by the American Urological Association. It comes in several forms, each with a different delivery schedule.
Topical gels are applied daily to the skin, typically starting at 50 mg per day. Intramuscular injections use testosterone cypionate or enanthate, usually 100 mg to start, given every one to two weeks. A longer-acting injectable form requires only one shot every 10 weeks after an initial loading period. Subcutaneous pellets, implanted under the skin, release testosterone steadily over three to four months.
All forms of external testosterone share one important trade-off: they shut down the brain’s signals that tell the testes to produce testosterone on their own. The pituitary gland stops releasing luteinizing hormone (LH) and follicle-stimulating hormone (FSH), which causes the testes to shrink and sperm production to drop. This is why TRT is not appropriate for men who are actively trying to conceive.
Drugs That Stimulate Natural Production
Some medications raise testosterone without replacing it directly. Instead, they work upstream, nudging the brain or testes to make more.
Clomiphene Citrate
Clomiphene is a selective estrogen receptor modulator, or SERM. The brain normally monitors estrogen levels as a way to gauge whether the body has enough testosterone (since testosterone converts to estrogen naturally). When estrogen is high, the pituitary dials back its signal to produce more. Clomiphene blocks estrogen receptors on the pituitary gland, essentially hiding the “off switch.” The pituitary responds by ramping up LH and FSH, which tells the testes to produce more testosterone. Because this pathway keeps the testes active, sperm production is preserved, making clomiphene an option for men who want to maintain fertility.
Human Chorionic Gonadotropin (hCG)
hCG mimics luteinizing hormone and directly stimulates the cells in the testes responsible for making testosterone. It is commonly used alongside TRT to prevent testicular shrinkage and preserve some degree of sperm production. Typical protocols range from 500 to 1,500 IU injected two to three times per week, with a lower maintenance dose of 250 IU every other day. When used on its own, hCG can raise testosterone while keeping the testes functioning, though it is more commonly paired with other treatments.
Aromatase Inhibitors
Anastrozole blocks the enzyme that converts testosterone into estrogen. Originally approved for treating breast cancer in postmenopausal women, it is used off-label in men whose estrogen levels are disproportionately high relative to their testosterone. By reducing this conversion, less testosterone is lost to estrogen, which can shift the balance in favor of higher circulating testosterone. Research from the Cleveland Clinic found that what matters most is not the estrogen level itself, but how efficiently the testes are producing testosterone in the first place. Aromatase inhibitors tend to be most useful as part of a broader treatment plan rather than as a standalone solution.
Androgen Blockers
Some drugs are designed to reduce testosterone’s effects. Spironolactone, primarily prescribed as a blood pressure medication and diuretic, also acts as an anti-androgen. It blocks testosterone from binding to its receptors, preventing it from doing its job even if blood levels remain the same. This property makes spironolactone useful in treating hormonal acne and excess hair growth in women, and it is part of some feminizing hormone therapy regimens. Other anti-androgens work through different mechanisms, such as preventing testosterone from being converted into its more potent form in tissues, but the net result is similar: reduced androgenic activity in the body.
Anabolic Steroids
Anabolic steroids are synthetic versions of testosterone used illicitly to build muscle. They flood the body with androgens, which causes the brain to completely shut down its own testosterone production. LH and FSH drop to near zero, the testes shrink, and sperm counts plummet. The longer someone uses anabolic steroids, the harder recovery becomes.
After stopping, hormone levels do eventually normalize in most people within twelve months. Recovery is faster with medical support. In one study, 87.5% of men who used clomiphene plus hCG after stopping steroids achieved normal sperm counts by twelve months, compared with just 59% of those who recovered without any medication. Testicular volume increased by at least 20% in 70% of men using both agents, versus 35% on clomiphene alone. The takeaway: the body can recover, but it often needs help, and the process takes months.
Prescription Drugs That Lower Testosterone as a Side Effect
Opioids
Chronic opioid use is one of the most common drug-related causes of low testosterone, and the effect is dramatic. Opioids suppress the hypothalamus, the part of the brain that initiates the entire hormonal chain leading to testosterone production. They also appear to directly inhibit testosterone production in the testes and adrenal glands.
The numbers are striking. Among patients taking daily doses equivalent to 100 to 200 mg of oral morphine for more than one month, 50 to 100% develop some degree of androgen deficiency. In one observational study, 89% of chronic opioid users had lab results confirming low testosterone, and 87% reported severe sexual dysfunction after starting opioids despite having no issues before. This side effect is dose-dependent and often underrecognized. If you are on long-term opioid therapy and experiencing fatigue, low libido, or mood changes, testosterone levels are worth checking.
Statins
Cholesterol-lowering statins also reduce testosterone, though to a lesser degree. A meta-analysis of randomized controlled trials found that statins lowered testosterone by about 0.66 nmol/L in men, based on five trials involving 501 middle-aged men with high cholesterol. In women with polycystic ovary syndrome (PCOS), statins lowered testosterone by about 0.40 nmol/L. The reduction in women with PCOS can actually be beneficial, since elevated testosterone drives many PCOS symptoms. In men, the drop is modest and unlikely to cause noticeable symptoms on its own, but it could compound with other factors like aging, obesity, or additional medications.
Recovery After Drug-Induced Changes
How quickly testosterone returns to normal after stopping a suppressive drug depends on what was used, for how long, and at what dose. Opioid-induced suppression can begin reversing within weeks of discontinuation, though full recovery varies. Steroid-induced shutdown follows a longer timeline, with most men normalizing within a year. Medications like clomiphene and hCG can accelerate this process by jumpstarting the brain-testes signaling pathway that was dormant during suppression.
For drugs like statins, the testosterone effect is ongoing while you take them but relatively small. The clinical significance depends on where your levels were to begin with. A man sitting at 350 ng/dL who starts a statin might dip below the 300 ng/dL threshold and begin noticing symptoms, while someone at 500 ng/dL would likely never feel the difference.