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Keywords are:  'quaff potions'

If you find a magical potion, you may quaff it to get spell effects.  Beware!
not all potions are benign, and some have unanticipated effects.

Your ability to quaff potions while in combat is dependent upon your dexterity.
There is a limit to how many potions you can drink over a short period,
dependent on your constitution.