I’ve just started to take an MAOB inhibitor, to add to pramipexole. In doing my due diligence, I find that http://www.medicines.org.uk/emc/medicine/13200/SPC/Eldepryl+5mg+Tablets/#CLINICAL_PRECAUTIONS
“Eldepryl (selegiline) SPC: ... Concomitant use not recommended ... Concomitant use of hypertensive or anti-hypertensive agents, psychostimulants, central suppressant drugs (sedatives, hypnotics) and alcohol should be avoided.”
“Not recommended” and “should be avoided” don’t seem to me to be as strong as “Whatever you do don’t drink alcohol!” (But I’m no doctor, and you mustn’t rely on what I think!).
*However,* the other main MAOB-I , Rasagiline, has *no* indication that you should even “avoid” alcohol. (Guess which I’m taking ...)