Common Cymbalta side effects may include nausea, upset stomach, dizziness, dry mouth, headaches, drowsiness, sweating, vomiting, muscle weakness, muscle pain, insomnia or other sleep disturbances, fatigue, diarrhea, and loss of appetite.
Other common side effects may include coughing, wheezing, upper respiratory problems, sexual side effects, shaking, tremors, blurry vision, yawning, and heartburn.
Also, see this article about antidepressants and weight changes.
More serious side effects can include suicidal thoughts or behavior, anxiety, agitation, aggression, panic, mood swings, and confusion.
Those who take Cymbalta also run the risk of developing a rare but dangerous condition called serotonin syndrome which occurs when the body produces an excess of serotonin.
Symptoms of serotonin syndrome may include confusion, changes in mental status, rapid pulse, hallucinations, shaking, tremors, difficulty passing urine, sweating, changes in blood pressure, fever, seizures, and coma.
Potential indications of an allergic reaction may include skin rash, hives, fever, wheezing, difficulty swallowing or any swelling of body parts including the tongue, face, hands, legs, and feet.
Taking antidepressants during pregnancy may prove harmful to unborn babies. Studies indicate an increased risk of birth defects and other problems. For more info, read this detailed warning about antidepressants and pregnancy.
The Food and Drug Administration has placed a category C warning on this medication which means it may prove harmful to unborn babies. To be safe, notify your doctor immediately if you become pregnant while taking this drug.
Antidepressants have been linked to an increased risk of suicidal thoughts and behaviors, particularly when taken by children, teenagers, and young adults. See this article about antidepressants and suicide.
Mixing With Alcohol
Drinking alcohol is not advised when taking antidepressant medication as it may increase the side effects of Cymbalta. For more detailed information regarding the potential health risks than can result from drinking while taking this medication, see antidepressants and alcohol.
Suddenly stopping this medication or missing a few doses may result in Cymbalta withdrawal.
Always take your medication as prescribed. Do not skip doses, or take excessive doses.
Never share your medication with others, and never sell your medication to others.
Report any serious or unusual side effects to your doctor right away. Depending on the severity or duration of your side effects, you may need to seek immediate emergency medical treatment.
If you visit the ER, once your problematic symptoms are stabilized and you are discharged from the emergency room, follow up with your prescribing doctor right away.
Most importantly, if you experience any thoughts of suicide while taking this medication, seek immediate medical assistance.