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Stings the target, draining 4% mana over 8 sec (up to a maximum of 8% of the caster's maximum mana), and energizing the Hunter equal to 300% of the amount drained. Only one Sting per Hunter can be active on any one target.
Drains 1% mana every 2 seconds, restoring 300% of the amount drained to the Hunter.
Duration: 8 seconds.
Viper Sting applies a poisonous sting that drain 4% mana over 8 sec (up to a maximum of 8% of the caster's maximum mana). Only one Sting per hunter can be active on any one target.
Viper Sting is a poison, and thus can be cleansed by druids, paladins, and shamans, as well as any mob that can cleanse poison. Rogues can dispel it with [Cloak of Shadows], and dwarves with [Stoneform].
Viper Sting is used against spell casters or any class with mana.
Improvements
Efficiency (MarksmanshipTalent): Reduces the mana cost of your Shots and Stings by 2% per rank (5 ranks total).
[Improved Stings] (Marksmanship Talent): Increases the mana drained by your Viper Sting by 6% per rank (5 ranks total).
Hawk Eye (Survival Talent): Increases the range of your ranged weapon by 2 yards per rank (3 ranks total).
Tips and tactics
When used with wound and deadly/mind numbing poison it's very annoying for a priest in PvP, especially if they're not specced holy.
Patch 3.0.8 (2009-01-20): Now drains a percentage of maximum mana.
Patch 1.6.0 (2005-07-12): Spells that drain mana will now properly report the amount of mana gained in the combat log.
Patch 1.4.0 (2005-04-19): This spell can no longer be used on warrior and rogue targets. In addition, while it can be used on a druid target at any time it will only drain mana when the druid is in caster form.
[Improved Stings], 
[Hawk Eye]
40
[Cloak of Shadows], and dwarves with 
[Stoneform].
Patch 4.0.1 (2010-10-12): Removed. 
