A blessed potion of healing will heal you for 8d4, uncursed for 6d4, and cursed for 4d4. When quaffing a blessed or uncursed potion, if you would gain more HP than your maximum, you'll gain 1 maxhp. Exercises constitution. Blessed potion will also cure sickness, and non-cursed will cure blindness.
Dipping a poisoned weapon into healing will remove the poison.
You can throw or hit this potion at Pestilence to deal damage to him. Monsters know how to use these, and shopkeepers may get one when they are generated.