Questions about starting dutasteride treatment

21M ,80kg ,fit and healthy.

First of all, i've never been on balding treatment and this is my first time, i'd say im at stage 1-2 norwood stage.

My dermatologist prescribed me deutasteride 2x a week, from what i've researched deu is not a common treatment as a first time thing and i have some questions.

- Is 2x a week too high or is it the norm?

- Understanding that side effects appear on <5% of people and having friends with no side effects at all, what is the probability of side effects appearing with that concrete dose and how to notice if they appear.

- Anything else that i should be aware of?