Some of these side effects may occur when taking this medication; they are as follows; Constipation, diarrhea, dizziness, dryness of mouth, headache, nausea, and trouble sleeping. However if any of these effects persist or worsen, contact your doctor right away.
Tell your doctor right away if any of these unlikely but serious side effects occur: agitation, blurred vision and other changes in vision, racing and irregular heartbeat, disorientation, new or worsened emotional problems, slow heartbeat, slurred speech, stuff neck, severe throbbing headache, symptoms of low sodium levels, thoughts of self harm or hurting others.
However if you gain the following side effects, stop taking this medication at once and seek immediate medical attention if any of the following occur; signs of a hypertensive reaction (e.g., severe headache with confusion and blurred vision, nausea, vomiting, severe anxiety, difficulty breathing, severe chest pain, seizures), signs of a serious allergic reaction (e.g., abdominal cramps, difficulty breathing, nausea and vomiting, or swelling of the face and throat), signs of serotonin syndrome (too much serotonin in the body; e.g., fast or racing heartbeat, loss of coordination, agitation, decreased reflexes, rapid changes in blood pressure, fever, heavy sweating, confusion)
A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.