DRUG INTERACTIONS: Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.

Some products that may interact with this drug include: fingolimod, drugs that affect liver enzymes that remove quinidine from your body (such as mifepristone).

This medication can slow down the removal of other medications from your body, which may affect how they work. Examples of affected drugs include digoxin, tricyclic antidepressants (such as desipramine, imipramine), among others.

Avoid taking MAO inhibitors (isocarboxazid, linezolid, methylene blue, moclobemide, phenelzine, procarbazine, rasagiline, selegiline, tranylcypromine) during treatment with this medication and for 2 weeks before and after treatment. In some cases a serious (possibly fatal) drug interaction may occur.

Many drugs besides quinidine may affect the heart rhythm (QT prolongation), including pimozide, thioridazine, among others.

Before using this medication, report the use of other drugs that increase serotonin, such as lithium, St. John's wort, sibutramine, street drugs such as MDMA/"ecstasy," tramadol, tryptophan, certain antidepressants including SSRIs (such as citalopram, paroxetine) and SNRIs (such as duloxetine, venlafaxine), "triptans" used to treat migraine headaches (such as eletriptan, sumatriptan), among others. The risk of serotonin syndrome may be more likely when you start or increase the dose of these medications.

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 dizziness, fainting, fast/irregular heartbeat.

NOTES: Do not share this medication with others.

Keep all regular medical and psychiatric appointments. Laboratory and/or medical tests (such as complete blood count, liver function) may be performed periodically to monitor your progress or check for side effects. Consult your doctor for more details.

MISSED DOSE: If you miss a dose, take it as soon as you remember. If it is near the time of the next dose, skip the missed dose and resume your usual dosing schedule. Do not double the dose to catch up.

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 2012. Copyright(c) 2012 First Databank, Inc.