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You may experience some mild side effects such as drowsiness, dizziness, dry mouth, nose, or throat, headache, upset stomach, constipation, or difficulty sleeping. These effects are generally manageable, but if they persist or worsen, it's important to consult a healthcare professional.

While most individuals using this medication do not encounter severe side effects, there are some serious effects that require immediate attention. These include mental or mood changes like confusion or hallucinations, ringing in the ears, difficulty urinating, and vision changes such as blurred or double vision. If you notice any of these, seek medical guidance promptly.

In rare cases, very serious side effects may occur, including a fast or irregular heartbeat or seizures. These require urgent medical assistance. Additionally, though extremely uncommon, serious allergic reactions can happen. Watch for symptoms like rash, itching or swelling (particularly of the face, tongue, or throat), severe dizziness, or trouble breathing, and seek emergency help if they occur.

This overview does not cover all possible side effects. If you experience any unusual symptoms not mentioned here, contact your healthcare provider for advice.

Some products that could interact with this medication include topical antihistamines like diphenhydramine cream, ointment, or spray. Additionally, using MAO inhibitors with this drug can lead to a severe and potentially life-threatening interaction. It is important to avoid MAO inhibitors, such as isocarboxazid, linezolid, metaxalone, methylene blue, moclobemide, phenelzine, procarbazine, rasagiline, safinamide, selegiline, and tranylcypromine, while you are taking this medication. Most MAO inhibitors should also be avoided for at least two weeks before starting this medication. Consult your doctor to understand when to begin or discontinue this medication.

Inform your doctor or pharmacist if you are using other products that may cause drowsiness, such as opioid pain or cough medications (including codeine and hydrocodone), alcohol, marijuana (cannabis), sleep or anxiety medications (such as alprazolam, lorazepam, or zolpidem), muscle relaxants (including carisoprodol and cyclobenzaprine), or other antihistamines (like cetirizine or diphenhydramine).

Check the labels on all your medications, including those for allergies or cough-and-cold, as they might have ingredients that can cause drowsiness. Consult your pharmacist to use these products safely.

This medication may interfere with certain medical or laboratory tests, such as brain scans for Parkinson's disease, urine drug screenings, or allergy skin tests, potentially leading to incorrect results. Ensure that all lab personnel and your healthcare providers are aware that you are taking this medication.