Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
low levels of sodium in the body--headache, confusion, hallucinations, muscle cramps, severe weakness, vomiting, loss of coordination, feeling restless or unsteady;
flushing (sudden warmth, redness, or tingly feeling);
swelling, weight gain;
a seizure;
weak or shallow breathing; or
a light-headed feeling, like you might pass out.
Serious side effects may be more likely in older adults.
Common side effects may include:
headache;
dizziness;
dry mouth;
nausea; or
mild stomach pain.
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.
 Desmopressin side effects (more detail)
