Autosomal Dominant Polycystic Kidney Disease
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Autosomal dominant polycystic kidney disease (ADPKD) is an inherited condition causing fluid-filled cysts to grow in the kidneys, gradually reducing kidney function. Tolvaptan can slow cyst growth in adults at risk of rapid progression.
Key facts
- Autosomal dominant polycystic kidney disease (ADPKD) is the most common inherited kidney disorder; fluid-filled cysts grow in the kidneys over decades and gradually crowd out healthy tissue.
- A mutation in the PKD1 or PKD2 gene, inherited from one parent, causes it; each child of an affected parent has roughly a 50% chance of carrying the gene.
- High blood pressure appears early and drives much of the long-term damage; tolvaptan, a vasopressin receptor antagonist, can slow the rate of kidney volume increase in adults at risk of rapid progression.
- A sudden drop in urine output, worsening flank pain, or repeated kidney infections need prompt medical assessment.
How the condition progresses
Cysts usually stay silent through childhood and early adulthood. By the third or fourth decade, many people start to notice flank pain, blood in the urine, or frequent kidney infections. High blood pressure tends to appear early and is one of the main drivers of long-term kidney damage. In a proportion of patients, the kidneys eventually lose enough function to need dialysis or a transplant, though the timeline varies widely: PKD2 mutations generally progress more slowly than PKD1.
Slowing cyst growth
Keeping blood pressure tightly controlled is central to managing ADPKD. Beyond that, tolvaptan has been shown to slow the rate of total kidney volume increase in adults at risk of rapid progression, by blocking the vasopressin receptor that otherwise drives cyst fluid accumulation. Staying well hydrated, aiming for pale urine throughout the day, reduces natural vasopressin release and complements this effect. Salt restriction, maintaining a healthy weight, and avoiding nephrotoxic substances, including high-dose NSAIDs, are also widely recommended to protect kidney function over time.
When to see a doctor
Seek prompt medical assessment for worsening flank pain, a sudden drop in urine output, visible blood in the urine, or repeated urinary or kidney infections. Anyone with a family history of ADPKD who hasn't been tested should discuss genetic counselling and screening options with a doctor, since earlier detection allows earlier blood pressure control.
This page is educational and does not replace advice from a doctor or pharmacist who knows your health history.