Canine Cushing’s Disease Treatment Costs — Lifelong Trilostane Medication Expenses

EndocrineQ&AMeongsiljang Veterinary Advisory Board

Canine Cushing’s disease is an endocrine disorder that requires lifelong medication management, so it’s important to estimate the annual costs in advance, including both trilostane and regular check-ups.

Canine Cushing’s Disease Treatment Costs: Once Started, It’s a Lifelong Commitment

A veterinarian examining the abdomen of an elderly Beagle

The cost of treating Cushing’s disease in dogs is a cumulative expense that includes diagnostic testing, lifelong trilostane medication, and regular monitoring. The key point isn’t just the “monthly medication cost” but rather the “long-term cost structure.” Typically, diagnosis costs range from $200 to $600, followed by monthly medication costs of $60 to $200, and annual follow-up exams costing $200 to $400 for 4–6 visits per year. Medication dosage—and therefore cost—increases proportionally with the dog’s body weight.

Why You Should Calculate Lifelong Costs in Advance

Cushing’s disease is an endocrine disorder caused by excessive cortisol secretion from the adrenal glands. The underlying causes are broadly categorized into pituitary-dependent hyperadrenocorticism (PDH), where a pituitary tumor excessively stimulates the adrenal glands, and adrenal-dependent cases, where an adrenal tumor directly secretes cortisol. The majority of cases are PDH. These two types can be differentiated using abdominal ultrasound or a high-dose dexamethasone suppression test, with textbooks indicating that the cause can be identified in approximately 75% of patients. In either case, lifelong management requires medication (trilostane) to suppress cortisol levels. Therefore, it is crucial for the entire family to decide at the time of diagnosis whether they can afford the treatment costs, to avoid the risks associated with discontinuing medication midway.

Monthly Trilostane Medication Costs by Weight (Estimated Range)

Item	Daily Dose (0.5–1mg/kg, q12h)	Estimated Monthly Drug Cost
Small Dog (5kg)	2.5–5mg × 2 times	About KRW 60,000–100,000
Medium Dog (10kg)	5–10mg × 2 times	About KRW 100,000–160,000
Medium-Large Dog (20kg)	10–20mg × 2 times	About KRW 150,000–220,000
Large Dog (30kg+)	15–30mg × 2 times	About KRW 200,000–300,000

Costs vary widely by clinic, pharmacy, and domestically distributed capsule specifications. Be sure to confirm a quote before getting a prescription.

One-Time Costs Incurred Only During the Diagnostic Phase

Cushing’s disease cannot be diagnosed with a single test. Typically, the following tests are performed in stages: - Basic blood and urine tests: $40 to $90. - ACTH stimulation test (adrenocorticotropic hormone stimulation test): Usually $100 to $200. - Low-dose dexamethasone suppression test: $90 to $100. - Abdominal ultrasound: To check adrenal gland size and the presence of tumors, $100 to $200. You can expect the total cost for diagnosis to range from $200 to $600.

A veterinarian performing an abdominal ultrasound on a puppy.

Never Skip Monitoring Tests After Starting Medication

Trilostane directly inhibits the synthesis of adrenal hormones (such as cortisol), so excessive dosing can lead to hypoadrenocorticism (Addisonian crisis). According to standard guidelines, you should adjust the dose based on ACTH stimulation tests that measure cortisol levels 2–4 hours after stimulation, conducted 10–15 days after starting treatment, then at 1 month, 3 months, and every 3–6 months thereafter. Although each test costs between $100 to $200, skipping these checks could result in much higher emergency hospitalization fees, so please never miss your scheduled monitoring appointments.

How Much Will the 1-Year and Lifelong Cumulative Costs Be?

Let’s simulate the costs for a 10 kg medium-sized dog. - First year: Diagnosis $400 + Medication approximately $1,000 ($90/month × 12) + Monitoring tests (4 times) approximately $600 = Approximately $2,000. - Second year onwards: Medication $1,000 + Regular check-ups $400 = Approximately $2,000 per year. Cushing's disease is not curable but requires lifelong management, so medication and testing must continue indefinitely. The actual treatment duration varies significantly depending on the dog's age at diagnosis and the presence of complications. When considering long-term treatment over several years, the cumulative lifetime cost often exceeds $7,000.

The guardian is at the dining table, reviewing the medicine bottles and a notebook to tally up the costs.

Practical Ways to Reduce Costs

- Timing for pet insurance: Once Cushing’s disease is diagnosed, it’s classified as a pre-existing condition, making new coverage difficult to obtain. The key is to enroll before your pet enters their senior years. - Medication cost comparison: Even for the same drug, trilostane, prices can vary by 30–40% depending on the clinic’s markup and capsule specifications. You can also take your prescription to a pet pharmacy for compounding. - Test bundle discounts: When scheduling regular monitoring, ask in advance about package discounts for the ACTH stimulation test combined with blood work. For detailed tips on maximizing your pet insurance, check out our Dog Pet Insurance Guide.

These Cost Items May Occur Separately

In addition to basic medication and diagnostic tests, if the adrenal tumor is large, your veterinarian may recommend an adrenalectomy, with surgical costs typically ranging from $2,000 to $4,000. Additional expenses may also arise for treating complications such as polyuria/polydipsia (PU/PD), skin infections, and hypertension. If diabetes mellitus is present, monthly insulin costs can add another $40 to $70. It is advisable for pet owners to receive a clear explanation of all potential unexpected costs right after diagnosis.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

What happens if I stop giving trilostane?

Trilostane is a medication that reversibly inhibits adrenal enzymes, so if treatment is stopped, cortisol levels will rise again and Cushing’s symptoms such as excessive thirst and urination and hair loss will recur. Cushing’s disease is not curable but rather a condition that requires lifelong management.

Isn't Mitotan (Lysodex) cheaper?

While mitotane may be less expensive, it is associated with frequent side effects such as vomiting and adrenal insufficiency (manifesting as lethargy, loss of appetite, vomiting, and weakness), which increases the monitoring burden. Consequently, recent textbooks often recommend trilostane as the drug of choice, since it is the only medication approved in many countries. Decisions should be based on safety rather than cost.

Can I give the medication every other day instead of daily?

No. Because trilostane has a short duration of action, it must be administered consistently every 12 hours (q12h) or every 24 hours (q24h) to maintain its effect. Arbitrarily extending the dosing interval can cause cortisol levels to spike again and complicate the interpretation of test results. Always consult your veterinarian before changing the dosage.

Does pet insurance cover the cost of Cushing’s disease treatment?

If you purchase pet insurance before a diagnosis, many policies cover a portion of medication and diagnostic testing costs. However, coverage limits for chronic endocrine disorders vary by policy, so it’s important to review the terms before enrolling. In most cases, enrolling after a diagnosis will result in the condition being excluded as a pre-existing condition.

How much longer can my dog live once treatment begins?

With proper management using trilostane, dogs can maintain a good quality of life for many years. Veterinary textbooks report that survival times with trilostane are comparable to those with mitotane. However, individual variation is significant, making it difficult to predict an exact lifespan. The most important factors influencing survival are the dog's age at diagnosis and the presence of any complications.

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References

[1] BSAVA Manual of Canine and Feline Dermatology, 4th Ed — Hyperadrenocorticism chapter

[2] 100 Top Consultations in Small Animal General Practice — The dog with hyperadrenocorticism (Sheena Warman)

[3] Clinical Medicine of the Dog and Cat, 4th Ed — Trilostane Therapy

[4] Perez-Alenza et al., Trilostane dosing recommendations, 2017