Is norepinephrine involved in MOTIVATION in particular, or is that more restricted to dopamine and serotonin?

I understand that dopamine clearly has a role in motivation, and serotonin has roles in motivation-kind of realms like depression. I've just heard that SNRI's bring more motivation to the table compared to SSRI's and was wondering if taking a norepinephrine agonist like pseudoephedrine occasionally while on an SSRI might increase motivation. Any ideas?