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What are possible side effects of Remeron?

Possible side effects of the antidepressant Remeron (mirtazapine) range from bothersome to very serious. A particularly dangerous side effect is an increased risk of suicide, especially in young adults, teenagers and children. You should call your doctor right away if you have suicidal thoughts, start acting aggressively or violently, have panic attacks, feel restless or hyperactive or notice any signs of worsening mood or behavior.

Another potentially life-threatening side effect, called serotonin syndrome, is caused by overly high levels of the neurotransmitter serotonin. Signs of this syndrome include a change in your mental state (such as agitation, hallucination or loss of consciousness), high or low blood pressure, muscle twitching or stiffness, a racing heart, sweating, fever, vomiting or diarrhea. While using Remeron, some people also develop:
  • seizures
  • high cholesterol
  • allergic reactions such as breathing troubles, rash or hives
  • chest pain or fast heartbeat
  • severe skin reactions
  • signs of low sodium (salt) levels in the blood, including headache, weakness or feeling unsteady, mental confusion or memory problems
  • flu-like symptoms
  • eye pain, changes in vision or swelling or redness in the eye
You should call your doctor right away if you experience any of these symptoms.

Less dangerous but more common side effects include sleepiness, weight gain, dry mouth, dizziness, unusual dreams, constipation, nausea or vomiting. Be sure to tell your doctor if any side effects bother or concern you, but do not stop taking the drug without his or her supervision. Stopping too quickly can also bring on unwanted symptoms, including headache, sweating, shaking and confusion.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.