• Formula: Powerful Anti-Venom
• Item Level 58Disenchants into:
  Not disenchantable
• Binds when picked up
• Requires First Aid (300)
• Requires Argent Dawn - Honored
• Use: Teaches you how to make Powerful Anti-Venom.
• [Powerful Anti-Venom]
• Requires Huge Venom Sac (1)
• 1 Charges
• Sell Price: 2 50
• Vendor 10

Source

This item is a reputation reward that teaches you how to make Powerful Anti-Venom; you must be Honored with Argent Dawn to purchase it for 10 from:

• Argent Quartermaster Hasana <The Argent Dawn> in Western Plaguelands
• Argent Quartermaster Lightspark <The Argent Dawn> in Western Plaguelands
• Quartermaster Miranda Breechlock <The Argent Dawn> in Eastern Plaguelands

Patch changes

• Patch 1.6.0 (12-Jul-2005): Added. 
  

External links

• Battle.net (EU)
• Wowhead
• Thottbot
• WoWDB