You risk having it stopped in the customs. Depending on where you live, dutasteride is most likely a medication where a prescription is needed, making it a controlled substance. In the worst case scenario, you might get a fine and have your address flagged by the customs, making it very hard to import something ever again at that address.
There's a multi border operation in several countries targeting illegal distribution of medications online now and then, it's called Operation Pangea. I've heard from some trusted sources I know that legal enforcement may be running Operation Pangea XII right now, and sources of illegal medication has been limited the last weeks (everything from erectil dysfunction medications to anabolic steroids). It is usually run for a few weeks to a couple of months. Being caught importing illegal medications is probably higher now.
As stated in the comments above, you just need to find a doctor who is willing to prescribe dutasteride legally for you. Hair clinics and dermatologists are more likely to prescribe it to you.