A Study to See if Tolvaptan Can Delay Dialysis in Infants and Children Who at Enrollment Are 28 Days to Less Than 12 Weeks Old With Autosomal Recessive Polycystic Kidney Disease (ARPKD)

Inclusion Criteria:

1. Male or female subjects between 28 days and < 12 weeks of age, inclusive at the timeof enrollment.
2. Must have clinical and imaging features that are consistent with a diagnosis of ARPKDwith all the following characteristics:

• Nephromegaly (> 2 standard deviations from age appropriate standard viaultrasound)
• Multiple renal cysts
• History of oligohydramnios or anhydramnios

3. Ability for parent or guardian to provide written, informed consent prior toinitiation of any trial-related procedures, and ability, in the opinion of theprincipal investigator, to comply with all the requirements of the trial.

Exclusion Criteria:

1. Premature birth (≤ 32 weeks gestational age)
2. Anuria or RRT, defined as intermittent or continuous hemodialysis, peritonealdialysis, hemofiltration, hemodiafiltration or history of kidney transplantation
3. Evidence of syndromic conditions associated with renal cysts (other than ARPKD)
4. Abnormal liver function tests including ALT and AST, > 1.2 × ULN
5. Parents with renal cystic disease
6. Need for chronic diuretic use
7. Cannot be monitored for fluid balance
8. Has or at risk of having sodium and potassium electrolyte imbalances
9. Has or at risk of having significant hypovolemia as determined by investigator
10. Clinically significant anemia, as determined by investigator
11. Severe systolic dysfunction defined as ejection fraction < 14%
12. Serum sodium levels < 130 mmol/L or >145 mmol/L
13. Taking any other experimental medications
14. Require ventilator support
15. Taking medications known to induce CYP3A4
16. Having an infection including viral that would require therapy disruptive to IMPdosing
17. Platelet count <50,000 µL
18. Significant Portal Hypertension
19. Bladder dysfunction or difficulty voiding
20. Taking vasopressin agonist
21. Having concomitant illness or taking medications that are likely to confound endpointassessments.
22. History of cholangitis
23. Received or scheduled to receive a liver transplant