Potion of Fire Breath

Potions of Firebreath transform the throat so that is possible to shoot a  firebreath towards the target in an arc. It can be bought from the Sorcerous Sundries in Baldur's Gate.

In-game description
"By drinking the potion of firebreath, it magically transform the throat so that it is capable of a giant breath of fire spewing forth in an arc. The effect does 6D10 damage to the target with a save vs. breath weapon for half."