The drugs finasteride and dutasteride belong to a class of medications known as 5-alpha-reductase inhibitors (5ARIs).
Blayne Welk, of Western University and the Institute for Clinical Evaluative Sciences in Ontario.
Men in the 5ARI group also had a 94 percent higher risk of depression in the first 18 months, compared to men not using these drugs.
Beyond 18 months, the increased risk of depression fell to 22 percent.
The proportion of men taking 5ARIs and experiencing erectile dysfunction is likely around 5 percent, according to Dr.