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Before using this medication, tell your doctor or pharmacist of all prescription and nonprescription/herbal products you may use, especially of: sodium oxybate, drugs affecting liver enzymes that remove this medication from your body (such as macrolide antibiotics including erythromycin, cimetidine, disulfiram, valproic acid, fluvoxamine, MAO inhibitors including furazolidone, isocarboxazid, linezolid, moclobemide, phenelzine, procarbazine, rasagiline, selegiline, tranylcypromine), isoniazid, lithium, phenothiazines (such as chlorpromazine).

This drug can speed up the removal of other drugs from your body by affecting certain liver enzymes. These affected drugs include "blood thinners" (such as warfarin), cyclosporine, doxycycline, estrogen, felodipine, metronidazole, quinidine, theophylline, certain beta blockers such as metoprolol, corticosteroids such as prednisone.

Tell your doctor or pharmacist if you also take drugs that cause drowsiness such as certain antihistamines (such as diphenhydramine), anti-seizure drugs (such as carbamazepine), medicine for sleep or anxiety (such as alprazolam, diazepam, zolpidem), muscle relaxants, narcotic pain relievers (such as codeine), psychiatric medicines (such as risperidone, amitriptyline, trazodone).

Check the labels on all your medicines (such as cough-and-cold products) because they may contain caffeine or drowsiness-causing ingredients. Also keep in mind that certain beverages (such as coffee, colas, tea, energy drinks) contain caffeine. Ask your pharmacist about using those products safely.

Acetaminophen is an ingredient in many nonprescription products and in some combination prescription medications. Read the labels carefully before taking other pain relievers, fever reducers, or cold products to see if they also contain acetaminophen. Consult your pharmacist if you are uncertain whether your other prescription or nonprescription products contain acetaminophen. (See also adult maximum daily dose information in Side Effects section.)

This medication may decrease the effectiveness of hormonal birth control such as pills, patch, or ring. This could cause pregnancy. Discuss with your doctor or pharmacist if you should use additional reliable birth control methods while using this medication. Also tell your doctor if you have any new spotting or breakthrough bleeding, because these may be signs that your birth control is not working well.

This medication may interfere with certain medical/laboratory tests, possibly causing false test results. Make sure laboratory personnel and all your doctors know you use this drug.

OVERDOSE: If overdose is suspected, contact a poison control center or emergency room immediately. US residents can call the US National Poison Hotline at 1-800-222-1222. Canada residents can call a provincial poison control center. Symptoms of overdose may include: severe drowsiness, slow breathing, severe dizziness, persistent nausea/vomiting.

NOTES: Do not share this medication with others.

Massage, hot baths, and other relaxation methods can help with tension headaches. Consult your doctor or pharmacist for more details.

Laboratory and/or medical tests (such as liver and kidney function tests) may be performed periodically to monitor your progress or check for side effects. Consult your doctor for more details.

MISSED DOSE: Not applicable.

STORAGE: Store at room temperature away from light and moisture. Do not store in the bathroom. Keep all medications away from children and pets.

Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company.

Information last revised May 2011 Copyright(c) 2011 First DataBank, Inc.