Ibuprofen is one of the most common over-the-counter pain relievers used worldwide But researchers have long warned against its risk of heart attack and stroke Non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen could increase the risk of heart attack by 31% Both diclofenac and ibuprofen were found to be the most commonly used NSAIDs in heart attack cases Ibuprofen and naproxen are available over the counter in the U.S. but require prescriptions in Denmark NSAIDS should be used with caution Avoi

Ibuprofen use linked to male infertility, study finds

Ibuprofen is one of the most common over-the-counter pain relievers used worldwide, and researchers have long warned against its risk of heart attack and stroke. But scientists now believe the drug, commonly sold under brand names such as Motrin or Advil, could potentially result in male infertility.

» RELATED: Common painkillers increase risk of heart attack by one-third, new study finds

The new findings come from researchers in Denmark and France who examined the effect of the drug on a group of men between the ages of 18 and 35.

Thirty-one men were given the maximum limit of 600 milligrams (or three tablets) of the drug each day for six weeks, a dosage commonly used by athletes. Other study participants were administered a placebo.

In just two weeks, the researchers found the men who took ibuprofen had an increase of luteinizing hormones, which males use to regulate testosterone production. This hormonal condition typically begins (if it ever does), during middle age.

» RELATED: Do you take ibuprofen for your headaches? Here are 5 things to know about the potential dangers of taking it and other NSAIDs

At the same time, the ratio of testosterone to luteinizing hormones decreased — a sign of dysfunctional testicles.

“The increase indicated that the drug was causing problems in certain cells in the testicles, preventing them from producing testosterone, which is, of course, needed to produce sperm cells,” Medical XPress reported.

As a result, the body’s pituitary gland responded by producing more of a different hormone, essentially compensating for ibuprofen’s effect on testosterone production. This phenomenon is called compensated hypoganadism, which can reduce sperm cell production and infertility, the scientists wrote. The condition is also associated with depression and increased risk for heart attack and stroke.

» RELATED: Want to gain some muscle? Beware of ibuprofen, study says

Because the small group of young male participants who took the drug only consumed it for a short time, “it is sure that these effects are reversible,” Bernard Jégou, co-author and director of the Institute of Research in Environmental and Occupational Health in France, told CNN. Compensated hypoganadism can lead to a temporary reduction in sperm cell production, but that’s not cause for alarm.

The larger concern, Jégou noted, is that using the drug for much longer periods of time could lead to a much more serious issue: overt primary hypoganadism, “in which the symptoms become worse — sufferers report a reduction in libido, muscle mass and changes in mood.”

The medical community, including study authors, believe larger clinical trials are needed to understand ibuprofen’s effects men using low doses of the drug and whether or not long-term effects are indeed reversible. 

Read the full study, recently published in the journal “Proceedings of the National Academy of Sciences of the United States of America.”

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