Get emergency medical help if you have signs of an allergic reaction to Xywav: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
weak or shallow breathing, breathing that stops for short periods of time;
severe drowsiness, feeling light-headed;
sleepwalking (may result in an injury), waking and confused behavior at night;
a seizure;
depression, anxiety, unusual or unpleasant thoughts;
feelings of low self-worth, loss of interest in things you once enjoyed;
confusion, paranoia, hallucinations (seeing or hearing things);
increased tiredness, trouble concentrating; or
suicidal thoughts or actions.
Common Xywav side effects may include:
falling asleep quickly even while standing or getting up from bed;
sleepwalking;
drowsiness, dizziness, headache;
bedwetting (in children);
sweating, anxiety; or
nausea, vomiting, diarrhea, loss of appetite, weight loss.
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.
 Xywav side effects (more detail)
