Ocean Book posted:

The 2010 Cochrane review found that compared with placebo, men taking finasteride are at increased risk for impotence, erectile dysfunction, decreased libido, and ejaculation disorder for the first year of treatment. The risk of side effects were dose dependent, with a higher risk for men taking 5mg in comparison to 1mg.[45] The rates also became indistinguishable from placebo after 2–4 years and these side effects usually got better over time.[6][46] A 2016 meta-analysis found that sexual dysfunction, including erectile dysfunction, loss of libido, and reduced ejaculate, may occur in 3.4 to 15.8% of men treated with finasteride or dutasteride.[28] This adverse effect has been linked to lower quality of life and can cause stress in relationships.[47]