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This medication may cause some mild side effects such as drowsiness, dizziness, dry mouth, nose, or throat, headache, upset stomach, constipation, or trouble sleeping. These effects are usually temporary, but if they persist or worsen, it’s important to consult with a healthcare provider.

While many individuals do not experience serious side effects, it’s crucial to be aware of them. Notify a healthcare professional immediately if you encounter any mental or mood changes like confusion or hallucinations, ringing in the ears, difficulty urinating, or vision changes such as blurred or double vision.

In rare cases, very serious side effects can occur, necessitating urgent medical attention. These include a fast or irregular heartbeat and seizures. Additionally, although a severe allergic reaction to this medication is uncommon, seek emergency assistance if you experience symptoms such as a rash, itching, swelling (especially of the face, tongue, or throat), severe dizziness, or trouble breathing.

This summary does not cover all possible side effects. If you experience any other unusual symptoms, please consult a healthcare professional for guidance.

Certain products may interact with this medication. These include skin-applied antihistamines like diphenhydramine cream, ointment, or spray. Using MAO inhibitors alongside this medication can lead to severe, potentially fatal interactions. It is important to avoid MAO inhibitors—such as isocarboxazid, linezolid, metaxalone, methylene blue, moclobemide, phenelzine, procarbazine, rasagiline, safinamide, selegiline, and tranylcypromine—while taking this medication. Most MAO inhibitors should not be taken within two weeks before starting treatment with this medication. Consult your doctor for advice on when to start or stop using this drug.

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

Check the labels on all your medications, including allergy or cough-and-cold products, as they might have ingredients that cause drowsiness. Consult your pharmacist to ensure safe use.

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