Talk to Andrologist on Erection Problem

I am 35 years old unmarried man,The problem is that, I am suffering from male pattern baldness, My dermatologist doctor prescribed me 5% Minoxidil and 1mg finasteride each day, I have been taking these two medication for almost one & a half month. In the first month of medication everything was ok but now I experiencing premature ejaculation soft and weak erection of penis & i am feeling that,The Hardness and stiffness of penis is also getting weaker with each passing day,I am very much worried whether should i continue finasteride or discontinue it.I discussed with my dermatologist about this problem, she asked me to continue this medicine for three months, perhaps This sexual side effect may be temparary & will go away subsequently. Now tell what should i do? Thank you, I will be waiting for your anwser.