Stop taking Remeron immediately and contact your doctor or get emergency treatment if you experience any of the following serious side effects:an allergic reaction (swelling of the lips, face, or tongue; difficulty breathing); seizures; a fast or irregular heartbeat; or fever, chills, a sore throat, flu-like symptoms, or sores in your mouth or nose. The last group of symptoms can be signs of agranulocytosis, a dangerous condition where your white blood cell count is lowered to the point where your body cannot properly fight infections.
More common Remeron side effects:You may experience other side effects that go away as your system adjusts to the medication. These usually do not need medical attention. However, check with your doctor if any of the following Remeron side effects continue or are bothersome:
sleepiness; nausea; increase in appetite; (sometimes significant) weight gain; dry mouth; dizziness; mild tremor; constipation.
Symptoms of Remeron Overdose:disorientation; drowsiness; impaired memory; tachycardia (fast heart rate).