passionate about dextromethorphan and quinidine Generic Name: dextromethorphan and quinidine (DEX troe me THOR fan and KWIN i deen) Brand Name: Nuedexta Overview Side Effects Dosage Professional Interactions More Pregnancy Warnings User Reviews Support Group Q & A What is dextromethorphan and quinidine? Dextromethorphan affects the signals in the brain that trigger cough reflex and is generally used as a cough suppressant. Quinidine affects the way that the heart beats and is generally used in people with certain heart rhythm disorders. Dextromethorphan and quinidine is a combination medicine used to treat involuntary outbursts of crying or laughing in people with certain neurological disorders, including multiple sclerosis and amyotrophic lateral sclerosis (ALS, or Lou Gehrig's disease). Dextromethorphan and quinidine may also be used for purposes not listed in this medication guide. Slideshow Mammogram Memos: What You Need To Know What is the most important information I should know about dextromethorphan and quinidine? You should not use this medicine if you have heart failure, a serious heart condition called "AV block" (unless you have a pacemaker), or a history of Long QT syndrome or life-threatening heart rhythm disorder. Do not use dextromethorphan and quinidine if you have used an MAO inhibitor in the past 14 days. A dangerous drug interaction could occur. MAO inhibitors include isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, tranylcypromine, and others. You also should not take dextromethorphan and quinidine if you are also taking mefloquine, quinidine, or quinine, or if you have ever had an allergic reaction or serious medical problem caused by taking any of these medications. Some medicines can interact with dextromethorphan and quinidine and should not be used at the same time. Tell your doctor about all medicines you use, and those you start or stop using during your treatment with dextromethorphan and quinidine. What should I discuss with my healthcare provider before taking dextromethorphan and quinidine? You should not take this medicine if you are allergic to dextromethorphan or quinidine, or if you have: heart failure; a history of life-threatening heart rhythm disorder; a serious heart condition called "AV block" (unless you have a pacemaker); a history of Long QT syndrome; or if you are also taking mefloquine, quinidine, or quinine. Do not use dextromethorphan and quinidine if you have used an MAO inhibitor in the past 14 days. A dangerous drug interaction could occur. MAO inhibitors include isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, tranylcypromine, and others. After you stop taking dextromethorphan and quinidine, you must wait at least 14 days before you start taking an MAOI. You also should not take dextromethorphan and quinidine if you have ever had any of the following problems caused by taking mefloquine, quinidine, or quinine: low levels of platelets in your blood; hepatitis; bone marrow suppression; or lupus-like symptoms (joint pain, fever, headaches, numbness or cold feeling in your fingers or toes). Some medicines can cause unwanted or dangerous effects when used with dextromethorphan and quinidine. Your doctor may need to change your treatment plan if you use any of the following drugs: tamoxifen; certain antidepressants--amitriptyline, clomipramine, desipramine, fluoxetine, paroxetine, sertraline, venlafaxine; certain heart rhythm medications--amiodarone, flecainide, procainamide, propafenone; or certain medicines to treat psychiatric disorders--chlorpromazine, haloperidol, perphenazine, pimozide, quetiapine, risperidone, thioridazine. To make sure dextromethorphan and quinidine is safe for you, tell your doctor if you have: an electrolyte imbalance (such as low levels of potassium or magnesium in your blood); heart disease, high blood pressure, coronary artery disease; slow heartbeats or any type of heart rhythm disorder; myasthenia gravis; bladder obstruction or other urination problems; or blockage in your digestive tract (stomach or intestines). FDA pregnancy category C. It is not known whether dextromethorphan and quinidine will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant while using this medication. It is not known whether dextromethorphan and quinidine passes into breast milk or if it could harm a nursing baby. Tell your doctor if you are breast-feeding a baby. Do not give dextromethorphan and quinidine to anyone under 18 years old without medical advice. How should I take dextromethorphan and quinidine? Follow all directions on your prescription label. Do not take this medicine in larger or smaller amounts or for longer than recommended. Dextromethorphan and quinidine is usually started at a dose of 1 capsule per day for 7 days. After the first week you will take 1 capsule every 12 hours. Follow your doctor's instructions. Do not take more than 2 capsules in a 24-hour period. You may take dextromethorphan and quinidine with or without food. Your doctor will need to check your progress on a regular basis. This will help your doctor determine how long to treat you with dextromethorphan and quinidine. Your heart function may need to be checked using an electrocardiograph or ECG (sometimes called an EKG). Store at room temperature away from moisture and heat. What happens if I miss a dose? Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose. What happens if I overdose? Seek emergency medical attention or call the Poison Help line at 1-800-222-1222. Overdose can cause severe dizziness, confusion, double vision, ringing in your ears, hearing loss, vomiting, fast or irregular heart rate, weak or shallow breathing, or seizure (convulsions). What should I avoid while taking dextromethorphan and quinidine? This medication may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert. Avoid getting up too fast from a sitting or lying position, or you may feel dizzy. Get up slowly and steady yourself to prevent a fall. Grapefruit and grapefruit juice may interact with dextromethorphan and quinidine and lead to unwanted side effects. Discuss the use of grapefruit products with your doctor. Ask a doctor or pharmacist before using any cough or cold medication . Dextromethorphan is contained in many combination medicines. Taking certain products together can cause you to get too much dextromethorphan. Check the label to see if a medicine contains dextromethorphan (Delsym, Robitussin Maximum Strength, Vicks 44, and others). Dextromethorphan and quinidine side effects Get emergency medical help if you have any of these signs of an allergic reaction : hives; difficult breathing; swelling of your face, lips, tongue, or throat. Stop using this medicine and call your doctor at once if you have: headache with chest pain and severe dizziness or fainting; fast or pounding heartbeats, fluttering in your chest; easy bruising or bleeding (nosebleeds, bleeding gums); pain or burning when you urinate; lupus-like symptoms--joint pain or swelling with fever, headaches, confusion, chest pain, shortness of breath, skin sores, butterfly-shaped skin rash on your cheeks and nose, and numbness, cold feeling, or pale appearance of your fingers or toes; liver problems--nausea, upper stomach pain, itching, tired feeling, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes); or high levels of serotonin in the body--agitation, hallucinations, fever, fast heart rate, overactive reflexes, nausea, vomiting, diarrhea, loss of coordination, fainting. Common side effects may include: diarrhea, gas, vomiting; swelling in your hands or feet; dizziness, weakness; or flu symptoms, cough. Side effects such as dry mouth, constipation, and confusion may be more likely in older adults. This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088. Side Effects (complete list) Dextromethorphan and quinidine dosing information Usual Adult Dose for Pseudobulbar Affect: -Initial Dose: Days 1 to 7: Dextromethorphan 20 mg-quinidine 10 mg orally once a day -Maintenance Dose: Day 8 and thereafter: Dextromethorphan 20 mg-quinidine 10 mg orally every 12 hours -Maximum dose: Dextromethorphan 40 mg-quinidine 20 mg orally per day Comments: The need for continued treatment should be reassessed periodically as spontaneous improvement of PBA occurs in some patients. Use: Treatment of Pseudobulbar Affect (PBA) What other drugs will affect dextromethorphan and quinidine? Many drugs can interact with dextromethorphan and quinidine. Not all possible interactions are listed here. Tell your doctor about all your medications and any you start or stop using during treatment with dextromethorphan and quinidine, especially: aprepitant; an antibiotic--azithromycin, clarithromycin, erythromycin, pentamidine, telithromycin; antifungal medicine--fluconazole, itraconazole, ketoconazole; anti-malaria medication--chloroquine, halofantrine; cancer medicine--arsenic trioxide, vandetanib; HIV or AIDS medicines--atazanavir, fosamprenavir, indinavir, nelfinavir, ritonavir, saquinavir, medicine to treat depression or mental illness--citalopram, escitalopram, nefazodone, pimozide, ziprasidone; or heart or blood pressure medication--diltiazem, disopyramide, dofetilide, ibutilide, sotalol, verapamil. This list is not complete and many other drugs can interact with dextromethorphan and quinidine. This includes prescription and over-the-counter medicines, vitamins, and herbal products. Give a list of all your medicines to any healthcare provider who treats you. Next Side Effects Print this page Add to My Med List More about dextromethorphan/quinidine Side Effects During Pregnancy Dosage Information Drug Interactions Support Group En Español 13 Reviews Add your own review/rating Drug class: miscellaneous central nervous system agents Consumer resources Dextromethorphan and Quinidine Dextromethorphan and quinidine (Advanced Reading) Other brands: Nuedexta Professional resources Dextromethorphan Hydrobromide and Quinidine Sulfate (AHFS Monograph) Dextromethorphan and Quinidine (Wolters Kluwer) Related treatment guides Pseudobulbar Affect Where can I get more information? Your pharmacist can provide more information about dextromethorphan and quinidine. Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed. Disclaimer: Every effort has been made to ensure that the information provided by Cerner Multum, Inc. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist. Copyright 1996-2012 Cerner Multum, Inc. Version: 1.04. Date modified: December 03, 2017 Last reviewed: January 29, 2014} Drug Status Rx Availability Prescription only C Pregnancy Category Risk cannot be ruled out N/A CSA Schedule Not a controlled drug Approval History Drug history at FDA Drug Class Miscellaneous central nervous system agents Related Drugs Pseudobulbar Affect Nuedexta , dextromethorphan / quinidine , More... Dextromethorphan / quinidine Rating 13 User Reviews 8.2 /10 13 User Reviews 8.2 Rate it! Help and Support Looking for answers? 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