There were no side-effects on liver, kidney or any other internal organ.20 Serum hormones were unaffected, with the exception of a desired 70% decline in DHT and a compensatory 10% increase in testosterone. Sexual side-effects were reported in both the finasteride and the placebo group: decrease of libido 1.9% versus 1.3%; decrease of potency 1.4% versus 0.9%; decrease of ejaculate volume 1.0% versus 0.4%. Although the differences between the finasteride and placebo groups were small and statistically not significant,20 finasteride must be considered capable of causing such effects in some men. A separate study found sperm function parameters to be unaltered by finasteride 1 mg.24

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