There have been several published reports that confirm Propecia can suppress sperm quantity and quality. However the affect of the drug on fertility is reversed after you stop taking it. Most reports suggest that the negative affect is largely reduced after 3 months off the drug, and continues to improve up to 6 months off the drug.
To know if you need to go off Propecia you first need to know how is your current sperm count and motility/morphology scores. If your current scores (on Propecia) are good, then you may not need the extra improvement brought about by discontinuing. However if you have low sperm count, then you should go off the drug for at least 3 months.
More important than sperm count, reports show that Sperm Fragmentation may also be effected by Propecia. Fragmentation is the chromosomal quality of the sperm cells (and this quality is not visible under a microscope). So I would also recommend you also get a sperm fragmentation test to show if you would benefit from going off Propecia for either 3 or 6 months.
Fragmentation tests can be done at any fertility clinic. it’s a pretty basic test these days, but you need to request it specifically.
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