Just like drugs, alcohol can be abused and have significant negative effects. In general, a character can consume a number of alcoholic beverages equal to 1 plus double his Constitution modifier before being sickened for 1 hour equal to the number of drinks above this maximum. Particularly exotic or strong forms of alcohol might be treated as normal drugs. Those who regularly abuse alcohol might eventually develop a moderate addiction.
Pathfinder RPG GameMastery Guide, © 2010, Paizo Publishing, LLC; Authors: Cam Banks, Wolfgang Baur, Jason Bulmahn, Jim Butler, Eric Cagle, Graeme Davis, Adam Daigle, Joshua J. Frost, James Jacobs, Kenneth Hite, Steven Kenson, Robin Laws, Tito Leati, Rob McCreary, Hal Maclean, Colin McComb, Jason Nelson, David Noonan, Richard Pett, Rich Redman, Sean K Reynolds, F. Wesley Schneider, Amber Scott, Doug Seacat, Mike Selinker, Lisa Stevens, James L. Sutter, Russ Taylor, Penny Williams, Skip Williams, Teeuwynn Woodruff.