Consumer Medication Information (CMI) distributed by pharmacies with prescriptions is NOT regulated by the FDA and may not contain a complete list of side effects from the medication's FDA approved label.
CMI is usually stapled to the prescription bag or inside it and is often produced by private companies that provide this information to pharmacies. It is different than a medication guide or patient package insert, which are FDA approved, published by drug manufacturers, and and required to be distributed with certain medications.
You can get accurate medication side effect information from the United States National Library of Medicine's DailyMed website.