Nephrocalcinosis is the deposition of calcium in the form of phosphate or oxalate within the renal tissue , which may lead to impaire the renal function . These crystals may aggregate and provide a nidus for the formation of renal stone ( Nephrolithiasis ). This study was performed to explore the diuretic effect of Rowatinex , Hydrochlorthiazide and some medicinal plants ( corn silk , celery , barley and senna ) , and there effect in attenuation or prevention of the development of nephrocalcinosis in an experimental model . Fourty —two local domestic rabbits were used in the present study , they were divided in to seven groups . One group was used as the control in which oxalic acid in a dose of 333 rng /kg orally was given to induced nephrocalcinosis . Other groups were treated two hours before induction by one of the above mentioned agents for each group . nephrocalcinosis was assessed by estimating blood urea nitrogen ( BUN) , serum creatinine , potassium and sodium , urine calcium inaddition to general urine examination on two occasions :1 day and 10 day after induction , also the histopathological examination of the rabbits kidney in the last day of experiment to detect the improvement in the treated groups in comparison to the control group . Animals pretreated with Rowatinex ( 200 mg/day ) orally and continued on the same dose for successive 10 days after induction , had a significant lower level(p<0.05) of BUN, serum creatinine ,potassium and higher level of serum sodium also elevation of urine calcium due to the diuretic effect of Rowatinex , also the histopathological examination showed a well improvement in comparison with the control group . Pretreatment with Hydrochlorthiazide ( 1 mg/kg body weight ) orally in a single dose before induction caused a significant lowering (p<0.05) of BUN , serum creatinine and potassium and prevention ot hyponatremia , also significant lowering of urine calcium also the histopathological examination which showed a notice improvement in comparison to the control group but it is less than that produced by Rowatinx. Aqueous extract of Corn Silk (1 gm /kg / day ) orally given before induction and continued for successive 10 days cause a significant lowering ( PO.05 ) of BUN , serum creatinine , potassium and prevention of hyponatremia also elevation of urine calcium level due to it is diuretic effect . In addition to the histopathological examination which showed a significant improvement in this case . Pretreatment with aqeous extract of fresh Celery ( 8 gm /kg / day ) add to the animal food continued on the same dose for 1 0 days after induction produced a significant ( p<0.05 ) reduction in BUN , serum creatinine , potassium level and prevention of hyponatremia , while elevation of urine calcium level as a diuretic effect and the histopathological examination which showed an improvement and reduction of the severity of nephrocalcinosis . Pretreatment with aqeous extract of Barley ( 1 mg/kg /day ) given orally and aqeous extract of Senna ( 1 gm /kg /day ) given orally and continued for 10 successive days also showed a significant ( p<0.05 ) reduction of BUN , serum creatinine , potassium and prevention of hyponatremia in addition to increase urine calcium level . The histopathological examination showed a a notice improvement in comparison to the control group , but inspite of this improvement there is also a side effect compined with using Senna which is represented by diarrhea which is due to the known purgative effect of Senna . And as aconclusion , the results of the previously mentioned drugs and medicinal plants showed a significant diuretic and attenuating effect on the induced nephrocalcinosis at the tested doses , so there is a possibility of using these agents in the treatment of this model of nephrocalcinosis with apossible preventive opportunity in patients at ahigh risk of developing nephrocalcinosis and may also with a long course of treatment help patients with renal stone disease .