This page contains a walkthrough of the Taste of Your Own Medicine side quest, during which you will meet X the raven and Fang, his owner. You will also get to try out experimental medicine and obtain said recipes.
Quest time limit: none
Reward: 400 EXP, 10 Relationship with Fang
To begin the quest, you need to find the raven named X. The bird is flying all over town, but can often be found along the route between the Commerce Guild and the City Hall. Talk to the animal and it will hand you a flyer advertising free medicine. This will initiate the quest.
Go to Medicine Stall on Time
The quest is to visit the Medicine Stall located right next to the Clinic. The medicine stall is only open on Wednesdays and Fridays, so make sure to visit on one of these days. Otherwise the stall will be empty, preventing you from completing the quest.
It turns out that the medicine offered by Fang is experimental and its effects are hard to predict. You can try all the products, but keep in mind that the effect can be either positive or negative (restoring or losing health, decreasing or increasing attributes). For each experiment, you will receive a recipe of the tested medicine and 3 Relationship points with Fang. This is the end of the quest.