Pjur Med Pro Long Spray 20Ml An enhancement product to prolong a mans pleasure: The active ingredient - tannic acid, derived from oak bark - has a contracting effect. In combination with panthenol, this gives the spray a desensitizing effect, which reduces the penis sensitivity and helps against premature ejaculation. For external application on the penis. Desensitizing. Against premature ejaculation. Natural active agent with a desensitizing effect.