What are the possible side effects of acetaminophen, butalbital, caffeine, and codeine?
• shallow breathing, slow heart rate; • fast or pounding heart rate, feeling short of breath; • feeling light-headed, fainting; • confusion, unusual thoughts or behavior; • muscle twitching; • easy bruising or bleeding; or • nausea, stomach pain, loss of appetite, itching, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes). Less serious side effects include: • feeling dizzy or drowsy, shaky or agitated; • mild nausea, vomiting, upset stomach, constipation, diarrhea; • increased appetite; • mood changes, sleep problems (insomnia); • sweating, urinating more than usual; • blurred vision; or • dry mouth. Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.
