Several widely prescribed medications can lower testosterone levels, sometimes significantly. Opioid painkillers are the most common culprits, but antidepressants, certain heartburn drugs, cholesterol medications, and anabolic steroids all affect testosterone production through different biological pathways. If you’re taking one of these medications and experiencing fatigue, low libido, or mood changes, the drug itself may be part of the problem.
Opioid Painkillers
Chronic opioid use is one of the most well-documented medication causes of low testosterone. These drugs suppress the hormonal signaling chain that tells your body to produce testosterone, a condition formally called opioid-induced androgen deficiency. This happens because opioids interfere with the brain’s ability to send the right hormonal signals to the testes.
The effect starts soon after you begin taking opioids, gets worse with higher doses and longer use, and can persist even after you stop the medication. Both prescription painkillers and illicit opioids cause this suppression. Despite how common the problem is, testosterone levels are rarely checked in men on long-term opioid therapy, which means many cases go unrecognized. If you’ve been on opioids for months or years and notice sexual dysfunction, persistent fatigue, or loss of muscle mass, low testosterone is a likely contributor.
Antidepressants (SSRIs)
Selective serotonin reuptake inhibitors, the most commonly prescribed class of antidepressants, can reduce testosterone through at least two mechanisms. First, the increase in serotonin activity directly affects the brain’s release of hormones that trigger testosterone production. Second, several SSRIs appear to directly interfere with the enzymes that cells use to manufacture testosterone.
The evidence varies by specific drug. Fluoxetine has been shown to reduce testosterone levels and shrink the cells in the testes responsible for producing it. Sertraline decreases testosterone while also raising prolactin, a hormone that further suppresses reproductive function. Citalopram affects both testosterone and sperm quality. Paroxetine alters the balance of steroid hormones, shifting production away from testosterone.
SSRIs also raise prolactin levels by shutting down a dopamine signaling network in the brain. When dopamine drops, prolactin rises, and elevated prolactin itself suppresses testosterone. This creates a compounding effect where one medication disrupts hormone balance through multiple routes at once. The sexual side effects many people experience on SSRIs, including low desire and difficulty with orgasm, are at least partly explained by these hormonal shifts.
Anabolic Steroids and Testosterone Supplements
This one catches people off guard: taking testosterone or anabolic steroids actually shuts down your body’s natural testosterone production. When your brain detects high levels of testosterone in the blood (whether from injections, gels, or oral steroids), it stops sending the signals that tell your testes to make more. Over time, the testes shrink from disuse.
After stopping anabolic steroids, recovery depends on how long and how heavily you used them. Testosterone levels typically return to near-normal over several months, and the hormones that drive production recover within three to six months. Testicular size also recovers, though it can take months to years. Sperm production follows a similar slow timeline. One effect that generally doesn’t reverse is breast tissue growth (gynecomastia), which tends to be permanent once established. Younger users and those with shorter periods of use tend to recover faster.
Heartburn Medications
Cimetidine, an older heartburn drug sold under the brand name Tagamet, has a unique anti-testosterone effect. Unlike most medications on this list, cimetidine doesn’t just reduce how much testosterone your body makes. It also competes directly with testosterone for binding sites on cells, essentially blocking the hormone from doing its job even when levels are adequate.
In men, cimetidine has been linked to loss of libido, erectile dysfunction, breast enlargement, reduced sperm counts, and measurable drops in blood testosterone levels. The drug impairs the activity of cells in the testes that produce testosterone and disrupts several steps in the hormone manufacturing process. Newer heartburn medications like ranitidine and famotidine don’t share this anti-androgen activity to the same degree, which is one reason cimetidine has fallen out of favor for long-term use.
Cholesterol-Lowering Statins
Statins do reduce total testosterone, but the clinical significance is modest. A meta-analysis of 16 studies found a statistically significant decrease in testosterone after statin use. Clinical trials specifically showed a more pronounced drop compared to observational studies, where the effect was negligible.
Here’s the important context: in nearly every study, testosterone levels remained within the normal range after statin use. The only exception was a study where participants already had below-normal testosterone before starting the medication. The conclusion from the available evidence is that statins cause a real but small reduction in testosterone, not enough to push most men into deficiency on their own. If your testosterone was already borderline low, though, statins could theoretically tip the balance.
Other Medications Worth Knowing About
Several other drug categories can lower testosterone, though the evidence varies in strength:
- Corticosteroids: Long-term use of drugs like prednisone suppresses the same brain-to-testes signaling pathway that opioids disrupt. The higher the dose and longer the duration, the greater the effect.
- Ketoconazole: This antifungal medication directly blocks testosterone-producing enzymes. It’s sometimes even used deliberately to suppress testosterone in medical settings.
- Certain blood pressure medications: Spironolactone, used for blood pressure and fluid retention, has anti-androgen properties and can lower testosterone while also blocking its effects at the cellular level.
- Chemotherapy drugs: Many cancer treatments damage the cells in the testes that produce testosterone, sometimes permanently.
What Low Testosterone From Medications Feels Like
The symptoms are the same regardless of the cause: fatigue that doesn’t improve with rest, reduced sex drive, difficulty achieving or maintaining erections, depressed mood, loss of muscle mass, increased body fat (particularly around the midsection), and sometimes difficulty concentrating. These symptoms develop gradually, which makes them easy to attribute to aging, stress, or the condition the medication was prescribed for in the first place.
If you suspect a medication is affecting your testosterone, the diagnosis requires a blood test, ideally drawn in the morning when levels are highest and after fasting. A single low reading isn’t enough. The Endocrine Society recommends confirming with a second morning fasting blood draw before making any diagnosis. From there, the conversation with your doctor centers on whether the offending medication can be changed, whether the dose can be reduced, or whether testosterone replacement makes sense given your overall health picture.