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Experiencing dizziness, lightheadedness, nausea, vomiting, loss of appetite, trouble sleeping, unusual dreams, or headaches are common side effects. These effects are usually mild, but if they persist or worsen, it's important to inform your doctor or pharmacist. The medication might cause saliva, urine, or sweat to darken, which is harmless but could stain clothing. To lessen dizziness and lightheadedness, rise slowly from sitting or lying down.

This medication can cause sudden sleep during daily activities like talking or driving, sometimes without prior drowsiness. If you find yourself getting unusually sleepy or falling asleep unexpectedly, avoid driving or engaging in potentially dangerous tasks until consulting with your healthcare provider. Alcohol and other drowsiness-causing medications can increase this risk.

Serious side effects require immediate medical attention. These include new or worsening uncontrollable movements, increased eye blinking or twitching, vision changes, eye pain, severe stomach pain, black or tarry stools, vomit resembling coffee grounds, mental changes like confusion or hallucinations, signs of infection, unusual bleeding, extreme tiredness, tingling in the extremities, and compulsive behaviors. Additionally, if you experience chest pain or fainting, seek urgent medical help.

Abrupt cessation or dose reduction might lead to a serious condition called neuroleptic malignant syndrome (NMS). Symptoms include fever, severe muscle stiffness, confusion, sweating, and irregular heartbeat. A serious allergic reaction is rare, but if you notice a rash, severe dizziness, breathing difficulty, or swelling, seek immediate medical assistance.

This summary does not cover all possible side effects. If you observe any other unexpected symptoms, contact your healthcare provider for guidance.

Avoid using MAO inhibitors while taking this medication, as it can result in a serious and potentially fatal interaction. MAO inhibitors include drugs like isocarboxazid, linezolid, metaxalone, methylene blue, moclobemide, phenelzine, procarbazine, and tranylcypromine. It's also important not to take most MAO inhibitors for two weeks before starting this medication. However, some MAO inhibitors, such as rasagiline, safinamide, and selegiline, might be used with close supervision by your doctor. Consult your doctor about when to start or stop this medication.

Additionally, this medication may affect the results of certain lab tests, including urine catecholamine, glucose, and ketone tests, leading to inaccurate results. Ensure that all your healthcare providers and lab personnel are aware that you are taking this medication.