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When taking this medication, some individuals may experience mild side effects such as nausea or headache. These are generally not serious, but if they persist or worsen, it's important to consult a healthcare professional. Most patients do not experience severe side effects with this medication.

However, be aware of potential serious side effects, including dizziness, fainting, a rapid or irregular heartbeat, and changes in mental state like anxiety or confusion. Other symptoms that require immediate medical attention are tremors, difficulty sleeping, and painful or difficult urination.

Although rare, serious allergic reactions can occur. Seek emergency medical help if you experience symptoms such as a rash, itching or swelling (particularly of the face, tongue, or throat), severe dizziness, or trouble breathing. While this summary includes many side effects, it is not exhaustive. If you notice any other unusual symptoms, you should contact a healthcare provider for guidance.

Avoid taking this medication with MAO inhibitors, as the combination can lead to a severe and potentially fatal interaction. Medications such as isocarboxazid, linezolid, metaxalone, methylene blue, moclobemide, phenelzine, procarbazine, rasagiline, safinamide, selegiline, and tranylcypromine should not be used while on this treatment. Additionally, most MAO inhibitors should be discontinued at least two weeks before starting this medication. Consult your doctor for guidance on when to begin or cease any medication.

Moreover, pseudoephedrine and guaifenesin can be found in both prescription and over-the-counter drugs. Carefully review all medication labels to avoid taking multiple products that contain these ingredients.

Lastly, this drug might affect certain laboratory tests, such as urine levels of specific acids, potentially leading to false results. Ensure all healthcare providers and lab personnel are aware that you are using this medication.