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You might experience some common side effects such as drowsiness, dizziness, headache, blurred vision, upset stomach, nausea, constipation, or a dry mouth, nose, or throat. These usually aren't serious, but if they persist or worsen, it's important to inform your healthcare provider. To ease dry mouth, consider using sugarless hard candy or ice chips, chewing sugarless gum, drinking water, or using a saliva substitute.

This medication can cause mucus in your lungs to dry up and thicken, potentially making breathing more difficult. To help prevent this, ensure you stay well-hydrated unless advised otherwise by your healthcare professional. When rising from a sitting or lying position, do so slowly to minimize dizziness and lightheadedness.

Though rare, serious side effects can occur. Contact your healthcare provider immediately if you experience mental or mood changes like confusion or hallucinations, ringing in the ears, tremors, trouble urinating, weakness, unusual bruising or bleeding, or changes in your heartbeat. Seizures are also a serious side effect that requires immediate attention.

Allergic reactions to this medication are uncommon, but if you notice symptoms such as a rash, itching or swelling especially around the face, tongue, or throat, severe dizziness, or difficulty breathing, seek medical help right away. While this is not an exhaustive list of side effects, if you observe any other unusual symptoms, consult your healthcare provider.

Avoid using this medication with specific MAO inhibitors, as it can lead to a significant and potentially life-threatening interaction. Do not take isocarboxazid, Metaxalone, methylene blue, moclobemide, phenelzine, procarbazine, Rasagiline, safinamide, Selegiline, or Tranylcypromine during your treatment. Additionally, most MAO inhibitors should not be used within two weeks before or after this medication. Consult your doctor for guidance on when to start or stop this medication.

Some products that may interact include skin-applied antihistamines (like diphenhydramine cream, ointment, or spray) and rolapitant. Inform your doctor or pharmacist if you are using other products that can 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 other antihistamines (such as Cetirizine, diphenhydramine).

Check the labels of all your medications, including allergy or cough-and-cold products, as they may contain ingredients that induce drowsiness. Consult your pharmacist for safe usage.

This medication may affect certain medical or lab tests, such as brain scans for Parkinson's disease, urine drug screenings, or allergy skin tests, potentially leading to inaccurate results. Ensure that lab personnel and all your healthcare providers are aware of your use of this drug.