I would consider selegiline myself to curb breaking down dopamine too much to NE. However, this description says selegiline increase cerebral nitric oxide and growth hormone: https://www.selegiline.com/Well, raising dopamine is a complex subject which certainly deserves a separate thread - I am sure there are several. I will like to quickly highlight few points I learned about dopamine:
Good dopamine levels and its proper metabolism is a wonderful thing.
Dopamine has to be broken down. Ideally, in a healthy person, most is broken down via MAO-A and COMT enzymes. If one or both of these are not working well, body will do one or two of the following things:
1.) it will create a new enzyme, MAO-B, which poorly breaks down dopamine, creating reactive oxygen species (ROS) and hydrogen peroxide in the process. This will cause neural damage and may even lead to Parkinson's in those individuals prone to it.
2.) it will up-regulate DBH enzyme that converts dopamine to noradrenaline / adrenaline. This can cause rapid conversion of dopamine to adrenaline, so by raising dopamine we end up with elevated adrenaline instead.
So, unless MAO-A and COMT enzymes are healthy, raising dopamine will cause problems, more or less, depending on the state of the factors involved.
Often, dopamine is reduced and replaced with serotonin as a harm-avoidance mechanism, a trade-off to prevent greater damage.
Dopamine agonist have merits, but also side-effects. I personally use some occasionally, but so far, low dose Selegiline has been the safest route for me, both from experience and understanding. When used in low dose, it inhibits MAO-B enzyme specifically.