Get emergency medical help if you have signs of an allergic reaction to Austedo: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Report any new or worsening symptoms to your doctor, such as: crying spells, changes in weight or appetite, feelings of low self-worth, loss of interest in things you once enjoyed, new sleep problems, or if you feel hopeless, guilty, extremely tired, irritable, hostile, aggressive, or have thoughts about suicide or hurting yourself.
Some side effects may actually be signs that your Huntington's disease is progressing. Your doctor will need to check your progress at regular intervals.
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);
pain or burning when you urinate;
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 Austedo side effects may include:
drowsiness;
feeling tired;
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.
 Austedo side effects (more detail)
