What side effects can this medication cause?

Acetaminophen, butalbital, and caffeine may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:

• drowsiness
• upset stomach
• vomiting
• stomach pain
• depression
• lightheadedness
• confusion

If you experience any of the following symptoms, call your doctor immediately:

• skin rash
• itching
• difficulty breathing

If you experience a serious side effect, you or your doctor may send a report to the Food and Drug Administration's (FDA) MedWatch Adverse Event Reporting program online at http://www.fda.gov/MedWatch/report.htm or by phone 1-800-332-1088.