Drugs taken by millions of men to alleviate depression may affect their fertility, say US scientists.
A small number of healthy men given the antidepressant paroxetine for four weeks had far higher levels of sperm with damaged DNA.
The results, reported in New Scientist magazine, do not necessarily mean these men would have serious problems becoming a father.
However, a UK fertility specialist said they were a "cause for concern".
Paroxetine, sold as Seroxat or Paxil, is one of the most commonly prescribed antidepressants in the UK.
This is the second study by a team of researchers at Cornell Medical Center in New York which points to a possible effect on sperm quality.
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