If you are:
No Known Risk: LIMITED DATA SUGGEST POOR ORAL ABSORPTION
An adult over 60:
management or monitoring precaution: General-Avoid for treatment of nocturia or nocturnal polyuria due to risk for hyponatremia. Safer alternatives exist.
Giving DDAVP to a child under 12:
Severe Precaution: Risk of water intoxication, hyponatremia and seizure. Monitor fluid intake.