What means Dragonlance ?

O, and I've another question about TB combat:

Well in battle, can I use a Healing potion (or Mana potion) to recover HP or MP while IN battle ? Does this cost extra action points or not ?
And I supose it need to be my Turn to use such a potion (or not) ?

Thanks in advance !

On 7th of february 2015 : I start a new adventure in the Divinity world of Original Sin,
it's a Fantastic Freaking Fabulous Funny ... it's my All Time Favorite One !