Desmopressin is used to control the amount of urine your kidneys make. Normally, the amount of urine you make is controlled by a certain substance in the body called vasopressin. In people who have "water diabetes" (diabetes insipidus) or certain kinds of head injury or brain surgery, the body does not make enough vasopressin. Desmopressin is a man-made form of vasopressin and is used to replace a low level of vasopressin. This medication helps to control increased thirst and too much urination due to these conditions, and helps prevent dehydration.
Desmopressin is also used to control nighttime bedwetting in children. It reduces how often your child urinates and decreases the number of bedwetting episodes.
Desmopressin can rarely cause a low level of sodium in the blood (hyponatremia), which can be serious or even fatal. Drinking too much liquid, using certain medications (such as "water pills"/diuretics including furosemide, glucocorticoids such as prednisone), being 65 years or older, or having certain medical conditions may increase the risk of low sodium in the blood. Lab tests (such as urine tests, sodium blood levels) must be done before you start using this medication and while you are using it. Keep all medical and lab appointments.
Tell your doctor right away if you develop symptoms of low sodium in the blood, such as nausea, vomiting, headache, muscle weakness/cramps, unusual tiredness, unusual drowsiness, dizziness, restlessness, mental/mood changes including confusion/irritability.
Get medical help right away if you have any very serious side effects, including seizure or trouble breathing.
How to Use This Medication
For the treatment of diabetes insipidus, take this medication by mouth, usually 2 to 3 times a day or as directed by your doctor.
For the treatment of bedwetting, take this medication by mouth, usually once a day at bedtime. Children should limit the fluids they drink after dinner, especially 1 hour before the desmopressin dose until the next morning, or at least 8 hours after the dose. If your child wakes up during the night, limit the amount that he or she drinks.
All patients taking desmopressin, especially children and older adults, must limit drinking of water and other fluids. Consult your doctor for details. If you find that you are drinking more fluids than directed, tell your doctor right away. Your treatment will need to be adjusted.
Dosage is based on your medical condition and response to treatment. Do not take more desmopressin or take it more often than prescribed.
Take this medication regularly to get the most benefit from it. To help you remember, take it at the same time(s) each day.
Tell your doctor if your condition does not improve or if this medication stops working well.