AD&D 2nd Edition

Sphere: Healing
Range: Touch
Components: V, S, M
Duration: 1 hour/level
Casting Time: 1
Area of Effect: Creature touched
Saving Throw: None

When this spell is placed upon a poisoned individual, it greatly slows the effects of venom, if it is cast upon the victim before the poison takes full effect. (This period, known as the onset time, is known to the DM.) While this spell does not neutralize the venom, it does prevent it from substantially harming the individual for the duration of its magic in hopes that, during that period, a full cure can be accomplished.

The material components of the slow poison spell are the priest’s holy symbol and a bud of garlic that must be crushed and smeared on the wound (or eaten if poison was ingested).