Some things can be used by one character on another during a fight, such as smelling salts to wake someone up. However, I don't think you can use healing potions on someone else. Then again, I never tried that myself; I relied on spells to heal during a fight when necessary.
If you're not happy with the priest class, next time, try a bishop. Slower to develop, but overall much more potent.
Nightowl2
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