Does Prednisone Increase or Decrease Testosterone?

Prednisone decreases testosterone. The drug suppresses the hormonal signals that drive testosterone production and acts directly on the cells in the testes that manufacture it, leading to lower circulating levels in men on ongoing therapy. The picture has some wrinkles, though, because a single short dose does not always produce a measurable drop, while long-term use raises the risk of clinically significant hormone deficiency. And for certain women, that testosterone-lowering effect is actually the therapeutic goal.

How Prednisone Drives Testosterone Down

Prednisone is a synthetic glucocorticoid, meaning it mimics cortisol, the body’s own stress hormone. Cortisol and testosterone have an antagonistic relationship: when glucocorticoid levels rise, testosterone production tends to fall. This happens through at least two routes working simultaneously.

The first route runs through the brain. Prednisone suppresses the pituitary gland’s release of hormones that tell the testes to produce testosterone. In men with rheumatoid arthritis who took low-dose prednisone, researchers found that both testosterone and the pituitary hormones that stimulate the testes were lower compared to patients not on the drug.¹ That pattern points to suppression starting upstream, at the level of the brain’s signaling hormones.

The second route is more direct. Glucocorticoids act on the Leydig cells in the testes, which are the cells responsible for making testosterone. Research has shown that stress-level glucocorticoid concentrations rapidly suppress a key signaling molecule inside Leydig cells, leading to a corresponding decline in testosterone output.² A study testing a single dose of prednisolone (prednisone’s active form) in healthy men found that the ratio of testosterone to the pituitary signal driving its production dropped across all measured time points, consistent with impaired Leydig cell function on top of whatever central suppression was happening.³

So prednisone hits testosterone production from both directions: it quiets the brain’s “make more testosterone” signals and simultaneously handicaps the testicular cells that carry out the order. The result, particularly over weeks and months, is lower testosterone.

A Single Dose vs. Weeks of Treatment

One of the more surprising findings in this area is that a single acute dose of prednisone does not always produce an obvious drop in total testosterone on a blood test. A study giving healthy men a one-time dose of prednisone found a significant decrease in the adrenal androgens DHEA and DHEA-S but no statistically significant change in testosterone itself.⁴ A separate study looking at short-term prednisone in healthy volunteers similarly reported no glucocorticoid effect on salivary testosterone, though the daily rhythm of DHEA was altered.⁵

This does not mean a single dose is harmless to the hormonal axis. The prednisolone study mentioned earlier did detect impaired Leydig cell responsiveness even after one dose; it just did not show up as a dramatic change in total testosterone in the blood.³ Think of it as the machinery starting to slow before the output visibly drops.

Chronic use is where the real clinical problem emerges. A study of men receiving ongoing glucocorticoid therapy found that current exposure significantly decreased both total and free testosterone levels. Patients on oral dexamethasone with a cumulative dose equivalent to about 240 mg of glucocorticoid had a roughly 7.5-fold increased risk of being diagnosed with hypogonadism, the clinical term for abnormally low testosterone.⁶ So the risk scales with how much drug your body has seen over time. A five-day burst for a bad asthma flare is a different story than months of daily prednisone for an autoimmune condition.

Adrenal Androgens Take a Hit Too

Testosterone is not the only androgen affected. Prednisone also suppresses the adrenal glands, which produce weaker androgens like DHEA and its sulfated form, DHEA-S. These are precursors that the body can convert into small amounts of testosterone and other sex hormones, so their suppression compounds the overall androgenic decline.

A review of cases involving low-dose prednisone (doses in the range often prescribed for inflammatory conditions) found that urinary DHEA excretion was dramatically suppressed, while downstream androgen metabolites also dropped, though to a lesser degree.⁷ The mechanism is straightforward: prednisone replaces the cortisol the adrenal glands would normally produce, so the brain stops sending the signal (ACTH) that also drives adrenal androgen synthesis. The glands essentially go quiet.

For most men, the testes produce the large majority of circulating testosterone, so adrenal suppression is a secondary contributor. But in women and in older men whose testicular output is already declining, the adrenal contribution matters more. Losing it on top of any direct testicular suppression can push someone from “low-normal” into clinically deficient territory.

The Role of SHBG and “Free” Testosterone

Testosterone circulates in the blood mostly bound to a carrier protein called sex hormone-binding globulin, or SHBG. Only the small fraction that is unbound, known as free testosterone, is biologically active. This means that changes in SHBG levels can shift how much active testosterone your body has available, even if total testosterone stays the same.

Glucocorticoid treatment has been shown to lower SHBG. In a study of children treated with prednisolone or dexamethasone for leukemia, five weeks of glucocorticoid therapy significantly decreased SHBG.⁸ Lower SHBG, in isolation, would actually free up more testosterone to be active. But this compensatory effect is modest and gets overwhelmed when total testosterone is dropping at the same time. It is worth knowing about, though, because it means a standard blood test measuring only total testosterone could underestimate or overestimate the functional impact of prednisone depending on what is happening to SHBG simultaneously. A clinician tracking hormone status during glucocorticoid therapy ideally measures both total and free testosterone.

Even Joint Injections Can Suppress Testosterone

People often assume that a steroid injection into a knee or shoulder stays local and does not affect hormones body-wide. That assumption is wrong. Glucocorticoid injected into a joint gets absorbed into the bloodstream, and the systemic effects, while temporary, can be substantial.

A prospective study of men who received a single intra-articular injection of triamcinolone (a common injectable glucocorticoid) into a joint found that serum testosterone dropped by about 57 ng/dL at one week post-injection. Levels then recovered by about 64 ng/dL between weeks one and four, returning close to baseline.⁹ A study in women with rheumatoid arthritis who received intra-articular glucocorticoid found a similar pattern: testosterone, DHEA-S, and estradiol all decreased temporarily before trending back toward baseline.¹⁰

The good news is that the suppression from a single injection is self-limiting, typically washing out within a month. But for someone already on the edge of low testosterone, or someone receiving injections in multiple joints over a short period, even a temporary dip could produce symptoms like fatigue, low mood, or reduced libido during that window.

When Lowering Testosterone Is the Point

Not every case of prednisone-induced testosterone suppression is unwanted. In women with excess androgen production, the ability of prednisone to dial down testosterone is therapeutically useful. Conditions like congenital adrenal hyperplasia and certain forms of polycystic ovary syndrome involve the adrenal glands overproducing androgens. Low-dose glucocorticoids quiet the adrenal androgen machinery, bringing testosterone levels down.

A study of 106 women of reproductive age with laboratory and clinical evidence of excess androgens found that daily prednisone at 7.5 to 10 mg significantly suppressed plasma testosterone levels.¹¹ For these women, symptoms like acne, excess hair growth, and irregular cycles improved alongside the hormonal shift. The testosterone-lowering effect that is a problem for men on chronic glucocorticoid therapy is, in this context, the treatment itself.

This duality is worth keeping in mind. The question “does prednisone lower testosterone?” has a different clinical meaning depending on who is asking. For a man worried about fatigue and muscle loss during long-term prednisone use, the answer represents a side effect to manage. For a woman with androgen excess, the same pharmacological property is the reason the drug was prescribed.

Muscle Loss and the Testosterone Connection

One of the most visible consequences of chronic glucocorticoid therapy is muscle wasting. Prednisone accelerates the breakdown of muscle proteins, an effect that is partly independent of testosterone but substantially worsened by the accompanying testosterone decline. Research on dexamethasone (a more potent glucocorticoid) has shown that it upregulates a specific enzyme in the protein-degradation pathway that tags muscle proteins for destruction, driving accelerated catabolism.¹² The same study demonstrated that testosterone has a protective effect against this process, meaning that when glucocorticoids simultaneously lower testosterone and ramp up protein breakdown, the two mechanisms reinforce each other in a particularly unfavorable way.

Clinically, this translates to loss of lean body mass and reduced strength. A trial of men on long-term prednisone (average daily dose around 12.6 mg) who were randomized to receive testosterone injections, nandrolone injections, or placebo for twelve months found that both androgen treatments reversed the muscle decline. Men receiving testosterone gained about 3.5% in lean mass, while the placebo group lost about 0.9%. Muscle strength also improved in the treatment groups.¹³

The bone side of the equation is equally important. The same trial found that lumbar spine bone density increased by about 4.7% with testosterone treatment but did not significantly change with placebo. An earlier trial of testosterone supplementation in glucocorticoid-treated men showed a comparable gain, with lumbar spine density increasing by about 5% during the testosterone treatment period, while lean body mass, which had been declining, stabilized and began to recover.¹⁴ These findings support a real clinical role for androgen replacement in men whose testosterone drops meaningfully during chronic prednisone therapy.

The Inflammatory Disease Paradox

Interpreting testosterone levels during prednisone use gets more complicated when you factor in the disease being treated. Chronic inflammatory conditions can themselves suppress testosterone. In rheumatoid arthritis, for example, the inflammatory burden drives changes in hormonal signaling. A study comparing RA patients on prednisone, RA patients not on prednisone, and healthy controls found a layered picture: RA patients not on prednisone had normal testosterone but elevated pituitary hormones, suggesting the body was working harder to maintain output. Those on prednisone had lower testosterone and only slightly elevated pituitary hormones, meaning the drug was suppressing the compensatory mechanism that had been propping testosterone up.¹

This creates a paradox. The inflammation itself may be damaging testosterone production, and prednisone, by reducing inflammation, could theoretically help. But prednisone also directly suppresses the hormonal axis, potentially doing more harm than good on the testosterone front. In practice, the net effect in most studies is lower testosterone in men taking prednisone for inflammatory diseases, but separating the drug’s contribution from the disease’s contribution is genuinely difficult. A man with severe rheumatoid arthritis who stops prednisone might not see his testosterone bounce back if the underlying inflammation is still raging.

What Happens When You Stop

For most people who take prednisone for weeks to a few months, testosterone recovery after stopping is expected, though it may not be immediate. The adrenal glands need time to wake back up after being suppressed, and the pituitary-gonadal axis similarly has to recalibrate. This recovery period varies by individual and by how long and how much glucocorticoid was used. A general rule of thumb from clinical practice is that longer courses and higher cumulative doses take longer to recover from.

The joint-injection data offers some reassurance for short exposures: testosterone returned to near-baseline levels within four weeks of a single intra-articular injection.⁹ For men who have been on oral prednisone for months or years, recovery is less predictable. The study of cumulative glucocorticoid exposure and hypogonadism found that previous exposure (meaning patients who had stopped) was associated with elevated estradiol levels, suggesting that hormonal disruption can linger even after the drug is gone.⁶ Men who have been on prolonged courses and are experiencing symptoms of low testosterone after discontinuation should have their levels checked rather than assuming everything has returned to normal.

Practical Considerations if You Are on Prednisone

If you are starting a prednisone course and worried about testosterone, the most important variable is duration. A short burst of a week or two for something like an allergic reaction or asthma flare is unlikely to produce meaningful or lasting testosterone suppression, based on the acute studies showing minimal changes in total testosterone from brief exposures. The risk climbs with weeks and months of continuous use, particularly at doses above 5 to 10 mg daily.

Men on chronic glucocorticoid therapy who develop symptoms consistent with low testosterone, such as persistent fatigue, loss of muscle mass, decreased libido, mood changes, or declining bone density, should raise the issue with their prescribing physician. Blood work including total testosterone, free testosterone, and the relevant pituitary hormones can clarify whether the drug is driving clinically significant suppression. As the trial data shows, testosterone replacement in this setting can reverse muscle and bone losses and improve quality of life.¹³

Resistance exercise deserves a mention here. While prednisone drives muscle protein breakdown, physical activity, particularly strength training, is the strongest non-pharmacological stimulus for maintaining muscle mass and supporting endogenous testosterone production. It will not fully counteract the glucocorticoid effects at higher doses, but it works in a complementary direction and is worth pursuing if your health allows it. Vitamin D and calcium supplementation are also standard recommendations during long-term glucocorticoid use to protect bone, but those address the skeletal risk more than the hormonal one.

Women taking prednisone for hyperandrogenic conditions should know that the testosterone-lowering effect is dose-dependent and tends to reverse after discontinuation, so ongoing monitoring makes sense both during and after treatment to ensure levels stay in the intended range without overshooting into deficiency.