can i get cheap proscar now (finasteride) is usually safe to take if you’re using low levels of estrogen. Less than 5 mg of finasteride per day may decrease testosterone levels in men. However, it is important to note that there have been reports of problems with sexual function, including decreased libido and erectile dysfunction after taking finasteride. Therefore, [empty] with Proscar therapy, you will be monitored carefully to assess any changes in your sexual function over time following treatment