<s>[INST] My son is 2 months old and having mild hydronephrosis in his left kidney .For atopic dermatitis Fenistil drops are prescribed.Does it have a side efffect on his kidney?Can it be given safely to him without affecting his problem of hydronephrosis? [/INST] You can give the medication without affecting the hydronephrosis. my concern is what treatment the child is on for his hydronephrosis </s>