Take Finasteride and Dutasteride Together?

Dear doctor
I have been using finasteride since 7 years and planning to use dutasteride now.Can I use both of them together in order not to lose what I had from finasteride ?

As dutasteride is used off label for treating hair loss, I rarely prescribe it for various legal reasons, but if your finasteride is not working to maintain your hair like it once was, then a trial of dutasteride might be a reasonable idea based upon information provided in this study. In that case, I would stop finasteride when using dutasteride. The mechanism of action is similar between the two medications, so benefits from finasteride should carry over if taking dutasteride. It’s not like when stopping minoxidil to switch to finasteride, where you will lose those minoxidil benefits (or vice versa), since the drugs work in entirely different ways.

Remember though, you do run a greater risk of significant side effects with dutasteride, like reduced sex drive and sexual performance issues. And the drug stays in your body for much, much longer than finasteride, so if you do see any of those side effects it’ll take quite some time for you to get rid of them. You should discuss your plans with your doctor.