Creating a Herbal concoction takes a number of hours equal to 1/10th of the DL of the task (in the case of Mandrake, it takes 2.5 hours to make a Mandrake Concoction). It isn't exactly a sit down and do it in ten seconds process XD. So unless the party is gonna sit down to rest, then no. 

You can still do First Aid on Leifr though. 

So yes it is possible to do multiple actions in an out of combat/turn situation, but only if action doesn't take hours or many minutes.