Deutetrabenazine is used in adults to treat involuntary muscle movements (chorea) caused by Huntington's disease. Deutetrabenazine is not a cure for Huntington's disease and will not treat other symptoms of this condition.

Deutetrabenazine is also used in adults to treat symptoms of tardive dyskinesia, a nervous system disorder. Tardive dyskinesia causes repetitive uncontrolled muscle movements, usually in the face (chewing, lip smacking, frowning, tongue movement, blinking or eye movement).

Deutetrabenazine may also be used for purposes not listed in this medication guide.

You should not use deutetrabenazine if you are allergic to it, or if you have:

• untreated or uncontrolled depression;
• thoughts about suicide or hurting yourself;
• if you have recently taken tetrabenazine or valbenazine; or
• liver disease.

Do not use deutetrabenazine if you have taken reserpine in the past 20 days, or 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, and tranylcypromine.

Tell your doctor if you have or have ever had:

• depression, anxiety, nervousness, anger, or agitation;
• mental illness or psychosis;
• suicidal thoughts or actions;
• breast cancer;
• a heart rhythm disorder;
• long QT syndrome (in you or a family member);
• an electrolyte imbalance (such as low blood levels of potassium or magnesium); or
• liver disease.

People with Huntington's disease may have a higher risk of depression and suicidal thoughts or behaviors. Taking deutetrabenazine may further increase this risk. However, the benefits of taking this medicine (improvement in daily living) may outweigh any suicidal risks.

Taking deutetrabenazine may cause symptoms similar to Parkinson's disease (resting tremor, stiff muscles, slow movements, difficulty maintaining balance and walking). Ask your doctor about your risk.

Your doctor will need to check your progress on a regular basis. Your family or caregivers should also watch for sudden changes in your behavior.

Tell your doctor if you are pregnant or breastfeeding.

Use Austedo Xr Patient Titration Kit (Oral) exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Some people have thoughts about suicide while taking deutetrabenazine. Stay alert to changes in your mood or symptoms. Your family or caregivers should also watch for sudden changes in your behavior.

Some side effects may actually be signs that your Huntington's disease is progressing. Your doctor will need to check your progress on a regular basis.

Call your doctor at once if you have:

• fast or pounding heartbeats, fluttering in your chest, shortness of breath, and sudden dizziness (like you might pass out);
• severe restlessness or agitation;
• tremors, shaking;
• muscle stiffness;
• problems with balance or coordination; or
• severe nervous system reaction--very stiff (rigid) muscles, high fever, sweating, confusion, fast or uneven heartbeats, tremors, feeling like you might pass out.

Common side effects may include:

• drowsiness;
• tiredness;
• dry mouth;
• runny or stuffy nose, sore throat;
• sleep problems (insomnia); or
• diarrhea.

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.

Avoid driving or hazardous activity until you know how this medicine will affect you. Dizziness or drowsiness can cause falls, accidents, or severe injuries.

Drinking alcohol with this medicine can cause side effects.