I have recently had a sperm analysis done and have seen that I have abnormal sperm morphology, pretty much close to 100%. I have been taking Propecia for close to 9 years. Does Propecia increase the effects of abnormal sperm morphology?
There is a report in Fertil Steril. 2013 Dec;100(6):1542-6. doi: 10.1016/j.fertnstert.2013.07.2000. Epub 2013 Sep 4. that state Propecia (finasteride) can cause reduced sperm counts in some men. It goes on to state: “In this population, counts improved dramatically for the majority of men after finasteride discontinuation. The hormone parameters, sperm motility, and sperm morphology were unchanged after cessation. Finasteride should be discontinued in subfertile men with oligospermia, and used with caution in men who desire fertility.”
In your case, we do not know if your sperm morphology was abnormal even before taking Propecia. It would be difficult to establish Propecia may have cause it. I simply do not know. Your question is better left to your urologist or reproductive specialist.