Codeine Side Effects. Severity: Major. You should check with your doctor immediately if any of these side effects occur when taking codeine:
- Bloating
- blurred vision
- chills
- cold, clammy skin
- confusion
- constipation
- darkened urine
- difficult or troubled breathing
- dizziness
- dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position