My experience is this after 5 years on RU and over 12 months on topical finasteride; they complement eachother very good. Individually they are not strong enough to halt my hairloss without increasing the dose to such amount the sides would be noticeable.
The reason i added finasteride to my regiment was because i was progressively losing ground on just RU. I wanted to keep using only one compound so i tried to stick with topical finasteride for some months but that didn't yeld good results, my scalp was constantly itching and when i tried to up the strenght to 2% it killed my dick and libido so i reduced the strenght and threw in the RU. My scalp immediately calmed down, and as of now i maintain without noticeable side effects. How much more can you really ask for?