Most men who are trying to conceive are taking something. A daily tablet for blood pressure, an antidepressant, a hair loss treatment, painkillers for a bad back. Very few have ever been asked whether that medication might matter for fertility.
Most of the time it does not. But "most of the time" is not the same as "never", and knowing which medications that affect male fertility fall into which category is the difference between an informed conversation with your doctor and months of unexplained frustration.
Quick answer: Most medications do not cause male infertility. The strongest evidence concerns testosterone therapy, anabolic steroids and chemotherapy, which can profoundly suppress sperm production. Finasteride, opioids and sulfasalazine have moderate evidence. Never stop a prescribed medication without medical advice.
Lifestyle matters for fertility. A BMC Public Health study found that women with 4–5 healthy habits had a 59% lower risk of infertility.
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takes 3 minutes to completeMale fertility depends on a coordinated interaction between the brain, the hormonal system, the testes and the reproductive tract. A signal that starts in the pituitary gland ends, roughly three months later, in sperm capable of fertilising an egg.
The medications that affect male fertility tend to do so in a few recognisable ways: reduced sperm production, impaired motility, altered morphology, lowered reproductive hormones, reduced libido, and difficulty with erection or ejaculation.
Some act on the hormonal signal, others on the testes directly, and others affect sexual function without touching sperm production at all. That last distinction matters, because a medication that makes conception harder by affecting sex is a very different problem from one that damages sperm.
The impact also varies considerably between individuals. Two men on the same dose can have entirely different outcomes, which is one reason the evidence here is less definitive than people expect.
Understanding what affects sperm quality more broadly gives useful context, since medication is rarely the only factor in play.
This is the single most important medication category in any discussion of male fertility, and it is also the most misunderstood.
Many men assume that raising testosterone will improve fertility. The opposite is true. Testosterone from an external source suppresses pituitary production of luteinising hormone (LH) and follicle-stimulating hormone (FSH), the two hormones that instruct the testes to make sperm.
Remove that signal and sperm production falls, sometimes dramatically. Documented consequences include markedly reduced sperm counts, severe oligozoospermia, and in some men complete absence of sperm in the ejaculate.
The causes of azoospermia are varied, but exogenous testosterone is one of the more preventable ones. The same mechanism applies to anabolic steroids, often taken at far higher doses than any therapeutic prescription.
The European Association of Urology advises specifically against testosterone treatment in men who wish to father children. If you are on replacement therapy and planning a pregnancy, have that conversation before you start trying, not after.
It is also worth separating this from the relationship between testosterone and stress, which works through entirely different mechanisms.
This content is for educational purposes only. It has been reviewed for scientific accuracy, but it does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional regarding medical questions or fertility treatment decisions.
Reviewed for scientific accuracy by: Dr. Mona Bungum
Last reviewed: August 2026
Lifestyle matters for fertility. A BMC Public Health study found that women with 4–5 healthy habits had a 59% lower risk of infertility.
Fill out the questionnaire, and get a personalised, holistic and evidence-based programme tailored to you.
takes 3 minutes to completeEvidence Grade: A (Strong). Supported by international guidelines, systematic reviews and extensive clinical evidence (EAU).
Finasteride and dutasteride are prescribed for male pattern hair loss and work by blocking the conversion of testosterone into dihydrotestosterone. They are generally considered safe.
A subset of men, however, experience fertility-related effects including reduced sperm concentration, lower semen volume, reduced total sperm count, and sexual side effects such as reduced libido.
The encouraging finding is that this appears largely reversible, with one study of infertile men showing substantial improvements in sperm counts after stopping finasteride. We cover the mechanism, recovery timelines and the topical versus oral question in our guide to hair loss treatments and fertility.
Evidence Grade: B (Moderate). Based on observational human studies and fertility clinic cohorts (ScienceDirect).
Stimulant medications for ADHD, including amphetamine-based treatments and methylphenidate, have drawn more research attention in recent years. The evidence so far is mixed rather than alarming.
A large retrospective study found stimulant use was associated with reduced semen volume and lower total motile sperm count, while sperm concentration, morphology and motility were largely unaffected.
Some men also report sexual side effects including reduced libido, delayed ejaculation, difficulty achieving orgasm and erectile dysfunction. The data remain limited and inconsistent, and no firm conclusion is available yet.
Evidence Grade: C (Limited). Evidence comes primarily from observational studies with inconsistent findings (Wiley).
Selective serotonin reuptake inhibitors such as sertraline, escitalopram, citalopram and fluoxetine are among the most widely prescribed medications in the world, which makes their fertility impact a common question.
The best documented effects concern sexual function rather than sperm production. Reduced sexual desire, delayed ejaculation, delayed orgasm and difficulty reaching orgasm are all recognised.
Some studies have reported changes in sperm quality, but the overall picture is inconclusive and the clinical significance uncertain.
Worth stating plainly: for most men on an SSRI, the fertility question is about whether conception is happening rather than whether sperm are healthy. That is solvable, and it does not warrant stopping treatment without medical guidance.
Evidence Grade: C (Limited). Human studies show variable findings and uncertainty regarding clinical significance.
Long-term use of opioids such as morphine, oxycodone, fentanyl and tramadol can suppress the body's own testosterone production by acting on the hypothalamic-pituitary-gonadal axis.
The result can include reduced libido, erectile dysfunction, lower sperm production and broader hormonal imbalance. Risk rises with higher doses and longer treatment, so a short course after surgery is a different proposition from years of maintenance therapy.
Everyday painkillers sit in a separate category entirely. If that is your question, our guide to paracetamol when trying to conceive addresses it directly.
Evidence Grade: B (Moderate). Supported by clinical studies demonstrating opioid-induced suppression of the hypothalamic-pituitary-gonadal axis.
Sulfasalazine, used in inflammatory bowel disease and some rheumatological conditions, has been recognised for decades as a reversible cause of impaired semen quality. Studies show reductions in sperm concentration, motility and overall fertility potential.
The reassuring part is the word reversible. Fertility often improves within several months of stopping, and alternatives are frequently available. If you are planning a pregnancy, raise it with your specialist early, because the switch and the recovery both take time.
Evidence Grade: B (Moderate). Supported by multiple clinical studies demonstrating reversible effects.
Cancer treatments, particularly alkylating chemotherapy agents, can significantly impair sperm production. Depending on regimen and dose, the effect may be temporary, long-lasting or permanent, and damage can extend to sperm DNA fragmentation rather than sperm numbers alone.
The practical implication is unambiguous and time-sensitive. Men facing chemotherapy should discuss sperm cryopreservation before treatment begins wherever possible. This is one of the few areas where a decision taken in a single week can determine options for life.
Evidence Grade: A (Strong). Supported by extensive clinical evidence and international fertility preservation guidelines.
Sildenafil, tadalafil and related PDE5 inhibitors are the reassuring entry on this list. Current evidence does not show meaningful impairment of sperm production, concentration, motility, morphology or reproductive hormone levels.
For men with erectile dysfunction, treatment may actually improve the likelihood of conception by making regular, well-timed intercourse possible. These medications belong in a different conversation altogether, about removing an obstacle rather than creating one.
Evidence Grade: B (Moderate). Multiple clinical studies have demonstrated no clinically meaningful adverse effect on male fertility.
If you are on long-term medication and planning a pregnancy, a few principles hold across almost every case.
Never stop a prescribed medication without medical advice. The risk of untreated depression, uncontrolled inflammatory disease or unmanaged pain is generally far more serious than an uncertain fertility effect.
Tell your fertility specialist about everything you take, including supplements and anything bought online, since the causes of male infertility are frequently multi-factorial and medication is only ever part of the picture.
Weight loss medication is another category worth mentioning specifically. We cover weight loss drugs and allergy treatments such as antihistamines and male fertility separately.
Consider a semen analysis if conception is taking longer than expected, since it converts speculation into data. Preparing for a semen analysis properly makes the result far more useful.
Male fertility testing at one of the trusted clinics near you will give a clearer baseline than any amount of reading.
Finally, remember that sperm production takes roughly 70 to 90 days. Improvement after a medication change will not show for several months, so patience is part of the process, as are the habits that improve sperm health regardless.
Common questions from men taking prescription medication while trying to conceive.
It can, and this is the strongest evidence on the list. External testosterone suppresses the LH and FSH signals that drive sperm production, which can lead to severely reduced sperm counts or none at all. The EAU advises against it for men wanting children.
Testosterone therapy and anabolic steroids have the most profound effect, followed by alkylating chemotherapy agents. Finasteride, dutasteride, long-term opioids and sulfasalazine have moderate evidence. Most other commonly prescribed medications have little documented effect on sperm count.
Anabolic steroids are the clearest case, and testosterone therapy should be discussed with a doctor before you start trying. Beyond that, avoid making changes alone. Give your specialist a full list of what you take and let them advise.
Usually not. Sulfasalazine and finasteride effects typically reverse within months of stopping. Testosterone-induced suppression often recovers, though it can take a year or longer and sometimes needs medical assistance. Chemotherapy is the main exception, where effects may be permanent.
Sperm production takes approximately 70 to 90 days, so no medication change will show in a semen analysis sooner than that. Three months is the usual minimum for reassessment, and recovery from testosterone suppression can take considerably longer.
The evidence is limited and inconsistent. Better documented is the effect on sexual function, including reduced desire, delayed ejaculation and difficulty reaching orgasm. For most men the practical obstacle is conception itself rather than sperm health, and stopping treatment without guidance is not advisable.
Current evidence suggests the effect is usually reversible, with studies showing substantial improvement in sperm counts after discontinuation. The timeline varies between individuals, and the topical versus oral distinction is a common follow-up question worth discussing with your prescriber.
No meaningful adverse effect has been demonstrated. PDE5 inhibitors do not appear to impair sperm production, quality or reproductive hormones. For men with erectile dysfunction they may actually improve the chance of conception by making regular intercourse possible.
It depends which ones and for how long. Long-term opioid use can suppress testosterone production, with risk rising alongside dose and duration. Occasional use of everyday painkillers is a different question and is generally far less concerning.
Wherever possible, yes. Alkylating chemotherapy agents can cause long-lasting or permanent damage to sperm production, and cryopreservation before treatment preserves options that cannot be recovered afterwards. This conversation should happen as early as possible in treatment planning.
The current evidence does not support stopping. One large study associated stimulant use with reduced semen volume and lower total motile sperm count, but concentration, morphology and motility were largely unaffected. Discuss it with your prescriber rather than deciding alone.
The honest summary is that this topic generates far more anxiety than the evidence supports. Most medications do not cause male infertility.
The medications that affect male fertility enough to warrant real attention are relatively few: testosterone therapy and anabolic steroids, chemotherapy, finasteride and dutasteride, and possibly some ADHD medications in susceptible men.
For everything else the evidence is either limited, inconsistent, or points towards sexual function rather than sperm quality. That is a more reassuring picture than most men expect when they start searching.
What it means in practice is that the useful response to a worry about medication is rarely to stop taking it. It is to get information.
A semen analysis and a conversation with a clinician who knows your full medication list will tell you more in a fortnight than months of reading forum posts.
If there is a problem, it is usually identifiable and often reversible. If there is not, you have removed a worry and can turn your attention to the factors that matter more.
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