Sounds like the maxalon is doing its job! There is another medicine called motilium which is also used to increase milk production, and seems to be better than maxalon for some people - so if you are still having troubles in a week or 2 then ask about that as well.
FOr a little while you need to either feed bub or express (if he's asleep) every few hours (even the dreaded 2am slot) to give the maxalon the best opportunity to increase supply as well.
Hang in there!