Alcohol can increase the risk of serious side effects from duloxetine. you should know that duloxetine may cause dizziness, lightheadedness, and fainting when you get up too quickly from a lying position. Duloxetine can pass into breast milk, but effects on the nursing baby are not known. Tell your doctor if you are breast-feeding. Tell your doctor if you are breast-feeding. Duloxetine is not approved for use by anyone younger than 18 years old. When duloxetine is prescribed for people with depression or anxiety, it can increase the risk of suicidal thoughts, particularly when the treatment is first started. If you experience any other symptoms which you think may be due to the capsules, please speak with your doctor or pharmacist for further advice. I have seen Cymbalta being prescribed for fibromyalgia and other chronic muscle pains also. Doctors can also prescribe Cymbalta for treating diabetic neuropathy. How to use Duloxetine HCL. Read the Medication Guide and, if available, the Patient Information Leaflet provided by your pharmacist before you start using duloxetine and each time you get a refill. How to use Cymbalta. Read the Medication Guide and, if available, the Patient Information Leaflet provided by your pharmacist before you start using duloxetine and each time you get a refill. Get emergency medical help if you have signs of an allergic reaction to duloxetine (hives, difficult breathing, swelling in your face or throat) or a severe skin reaction (fever, sore throat, burning eyes, skin pain, red or purple skin rash with blistering and peeling). Cymbalta is the brand name for duloxetine, an antidepressant prescribed to treat the symptoms of depression. In addition to depression, doctors can prescribe Cymbalta to treat anxiety that lasts. Cymbalta (duloxetine) is a selective serotonin and norepinephrine reuptake inhibitor antidepressant (SSNRI). Duloxetine affects chemicals in the brain that may be unbalanced in people with depression. Community discussion about Duloxetine. Part of the mental health category. Symptom, treatment and advice from community members. Duloxetine forum content is not moderated or reviewed by doctors.