My eight year old son was having trouble with bedwetting and our pediatrician prescribed DDAVP. After reading some information on your web site, I was wondering if I should have him tested for a form of NDI.

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Topic: Medications
Author: Robertson, Gary
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If the DDAVP controls your son's bedwetting, he does not have NDI since DDAVP does not work in NDI. However, he should be evaluated for possible pituitary DI. If the DDAVP does not control his bedwetting, your son could have nephrogenic DI, although there are also causes of bedwetting that are refractory to DDAVP treatment.