Labels:text | black | screenshot | black and white | font | document OCR: o apparent to some form of Primary polydipsia may occu reason, but more often it is r aused by drugs psychiatric illness. Mouth dry s) or e.g. monoamine oxidase inh ished from true normally mouth-breathing must be dis olality in primary polydipsia. Vasopressin secre also be impaired suppressed by the low plasm d, since the polydipsia, but its renal actio if excessive fluid intake is pr al interstitial solute concentration within ffect medulla is reduced by a 'was]