From here, you receive Neutral [60R] The Only Prescription. The book required to translate the Draconic text has been torn in 8 separate pieces, and all 8 pieces must be acquired to complete the quest. The locations are as follows:

1. [Chapter I]: Located on Alcaz Island in Dustwallow Marsh. You must defeat Combat Dr. Weavil to receive the book. He is much harder than No. 2 and requires about 15 people to defeat.
2. [Chapter II]: Felguard Elites and Doomguards in the Blasted Lands have a chance to drop it. These require 4-5 people to farm effectively. (~4% drop rate)
3. [Chapter III]: Hederine Initiates & Hederine Slayers in Winterspring at Darkwhisper Gorge have a chance to drop it. These require 1-2 people to farm effectively. (~6% drop rate)
4. [Chapter IV]: Located in Undercity[77, 38] on a table in the Magic Quarter.
5. [Chapter V]: Located in the Stormwind Keep library [72, 6] (turn left as you walk in).
6. [Chapter VI]: Dropped by Onyxia.
7. [Chapter VII]: In Blackwing Lair in the room after Broodlord Lashlayer, along Firemaw's patrol path. It is on a table on the ramp in the corner to the left of the wyrmguard + 3 overseer pack.
8. [Chapter VIII] Dropped by Ragnaros.

* Note: These pieces are white items thus they are in the round-robin loot table and cannot be master-looted. That means, for chapter 1, 6, 8 that require a raid, you have to ask the raid leader to change the loot rule to 'Free for all', or, to ask every member to check boss' corpse even they don't have this quest. In the later case, a single logged or HSed member may make your effort in vain.
* Completing the quest Neutral [60] The Only Prescription rewards the [Gnomish Turban of Psychic Might].