Vetoryl (trilostane) is a prescription medication for dogs that blocks the adrenal glands from making too much cortisol; in plain terms, it’s an adrenal hormone blocker used for Cushing’s disease. It belongs to the adrenal steroidogenesis inhibitor class. ([dechra-us.com](https://www.dechra-us.com/management-areas/companion-animals/endocrinology/canine-hyperadrenocorticism/treating-cushings?utm_source=openai))
Primary uses: managing Cushing’s disease in dogs, including both pituitary‑dependent and adrenal tumor forms. Species: dogs. Rx status: prescription only in the U.S. (veterinarian-required). ([dechra-us.com](https://www.dechra-us.com/our-products/us/companion-animal/dog/prescription/vetoryl))
Common owner‑reported side effects can include decreased appetite, vomiting, diarrhea, or low energy. If an owner reports severe vomiting or diarrhea, marked weakness, collapse, or that the dog “seems very unwell,” escalate immediately for veterinary assessment. Your veterinarian can discuss how the medicine is monitored and how long a pet may need it. ([dechra-us.com](https://www.dechra-us.com/our-products/us/companion-animal/dog/prescription/vetoryl))
Front desk script: Vetoryl is trilostane, a prescription adrenal hormone blocker for dogs used to manage Cushing’s disease. It’s vet‑only and not an over‑the‑counter product. If you’re seeing vomiting, bad diarrhea, weakness, or collapse, please come in now or go to the emergency hospital. Your veterinarian can explain the plan for monitoring and how long your dog may need this medication.
Common owner Q&A you’ll hear about Vetoryl (trilostane):
Q: How do I give Vetoryl? A: Follow the label from your veterinarian. It is given by mouth with food. Do not open or split the capsules, wash hands after giving, and people who are pregnant or trying to conceive should avoid handling; your veterinarian can confirm the best timing for your dog.
Q: What if I miss a dose? A: Give it when you remember unless it’s close to the next scheduled dose—then skip the missed dose. Do not double up. If more than one dose was missed, your veterinarian can advise what to do next.
Q: What side effects should I watch for? A: Mild tummy upset or lower energy can occur when starting. Concerning signs include vomiting, diarrhea, not eating, shaking, weakness, or collapse. If these happen, contact your veterinarian immediately; if your dog collapses, has severe or bloody diarrhea, or seems very weak, go to an emergency clinic right away.
Q: When will I see improvement? A: The medication starts working within 1–2 days, but visible changes can take days to weeks. Your veterinarian can discuss what to expect for your dog.
Q: Will my dog need checkups or blood tests? A: Yes—regular rechecks and lab monitoring are part of safe use. Your veterinarian will schedule these visits, especially after starting or changing the dose.
Front desk script: Vetoryl is a prescription used to manage Cushing’s disease in dogs. Please give it exactly as directed on your label—by mouth with food—and don’t open the capsules. If you miss a dose, give it when you remember unless it’s close to the next one; skip the missed dose and don’t double up. If you see vomiting, diarrhea, not eating, shaking, weakness, or collapse, contact us right away; if your dog seems very ill or collapses, please go to the nearest emergency hospital. The doctor will let you know when follow-up blood tests are due—would you like me to schedule that visit?
What owners commonly report after starting Vetoryl (trilostane): upset stomach (vomiting or diarrhea), not wanting to eat, acting tired or "down," or seeming weak/shaky. Some owners also notice their dog is drinking and urinating less and is not as ravenous—those changes are expected as Cushing’s signs come under control. Because this medication can occasionally lower cortisol too much, even mild tummy upset or notable lethargy can be important.
Call back to the veterinarian the same day for any of the following: vomiting (even once), diarrhea, poor or reduced appetite, unusual sleepiness, shaking/trembling, weakness/wobbliness, or any other concerning change. Treat the following as emergencies: collapse, repeated or severe vomiting/diarrhea, blood in stool, inability to keep water down, or refusal to eat anything for a full day—direct the caller to an emergency hospital if our doctor is unavailable. Your veterinarian can discuss whether any medication changes or testing are needed and what to watch for at home.
Front desk script: Thanks for calling—I'm sorry your dog isn’t feeling well. Because signs like vomiting, diarrhea, not wanting to eat, unusual sleepiness, shaking, or weakness can be important on Vetoryl, I’m alerting our veterinarian now so they can advise you. If your dog collapses, has bloody stool, or can’t keep water down, please proceed to the nearest emergency hospital right away. While I connect you, may I confirm when today’s dose was given and any other medications your dog received?
Vetoryl (trilostane) is supplied only as hard gelatin capsules for dogs. Give the capsule whole with food, and try to give it at the same time each day as prescribed. Do not open, crush, or split the capsule; wash hands after handling, and people who are pregnant or trying to conceive should avoid handling the medication.
If a dog won’t take the capsule, try hiding it in a small treat or pill pocket and then offer the rest of the meal. If pilling remains difficult, your veterinarian can discuss whether a compounding pharmacy is appropriate for your pet; note that some compounded trilostane products have shown variable potency, so this decision should be made by the doctor and pharmacy together.
Troubleshooting: If the dog vomits, has diarrhea, won’t eat, seems very tired/weak, or collapses after a dose, these can be signs that need prompt veterinary attention with Vetoryl. Do not make any medication changes on your own—contact the veterinarian the same day for guidance, and seek emergency care immediately for severe signs like collapse or repeated/severe vomiting or diarrhea.
Front desk script: Vetoryl only comes as capsules—please give the capsule whole with a meal and don’t open or crush it. If your dog won’t take it, you can try a pill pocket or a small food “meatball”; if that still doesn’t work, I’ll have the doctor discuss options like using a compounding pharmacy. Because vomiting, diarrhea, not wanting to eat, unusual tiredness, weakness, or collapse can be serious with Vetoryl, I’m going to alert the doctor right away so they can advise you. If your pet collapses or has severe or repeated vomiting/diarrhea, please go to the nearest emergency hospital now.
Refills for Vetoryl (trilostane) must be reviewed by a veterinarian because this drug requires ongoing monitoring. When a caller requests a refill, collect: pet and owner name, medication name, capsule strength as printed on the bottle, how often they are giving it, remaining quantity, and preferred pharmacy (in‑clinic or outside). Typical processing time is 1–2 business days for the doctor to review the record; faster service may be possible if the pet is current on exams and labs.
Recheck and lab schedule to screen for over‑ or under‑control are part of the label: an exam and ACTH stimulation test (a timed cortisol blood test) about 10–14 days after starting or after any dose change, then additional rechecks around 30 days, 90 days, and about every 3 months thereafter. Refills are usually approved only when the pet is up‑to‑date on these rechecks; schedule the next visit if overdue and flag the request for the veterinarian to review. The veterinarian can discuss testing timing and any changes if needed.
Online pharmacy requests: send for brand-name Vetoryl capsules unless the veterinarian specifies otherwise. Vetoryl is the only FDA‑approved trilostane product for dogs; compounded trilostane products are not FDA‑approved and must be specifically authorized by the veterinarian if clinically necessary. If the caller reports red‑flag signs while on Vetoryl—vomiting, diarrhea (especially bloody), poor appetite, marked lethargy, weakness, or collapse—do not handle as a routine refill; immediately transfer to a veterinarian or nurse. If the clinic is closed, instruct the caller to seek emergency veterinary care right away.
Front desk script: I can help with your Vetoryl refill. First, I’ll confirm your dog’s name, the Vetoryl capsule strength on the bottle, how often you’re giving it, how many doses you have left, and where you’d like it filled.
Our doctor reviews Vetoryl refills because regular rechecks and a cortisol blood test are needed; if your dog is current, approval usually takes 1–2 business days.
If you prefer an outside pharmacy, we can send a prescription once the veterinarian approves; we typically use brand-name Vetoryl unless the doctor specifies otherwise.
If your dog is vomiting, has severe diarrhea, isn’t eating, is very tired or weak, or has collapsed, I’m going to transfer you to the veterinarian right now; if we’re closed, please go to the nearest emergency hospital.
Escalate to a veterinarian/technician immediately for any dog on Vetoryl (trilostane) with: repeated vomiting or diarrhea (especially bloody or black/tarry stool), refusal to eat, marked lethargy or weakness, shaking/tremors, disorientation, pale gums, collapse, or seizures. These can signal a severe reaction to the medication and can be life‑threatening.
If an overdose is suspected (extra doses given or the dog chewed the bottle), treat as an emergency. Watch for fast-onset not eating, vomiting/diarrhea (may be bloody), extreme tiredness, wobbliness, tremors, or collapse. Contact a veterinarian/tech now; if after hours or the dog is collapsing or having trouble breathing, direct the caller to the nearest emergency hospital. You may provide a poison control number for immediate guidance.
Treat sudden facial/muzzle or eye swelling, hives, vomiting/diarrhea with swelling, trouble breathing, or collapse as a possible severe allergic reaction—this is an emergency. Your veterinarian can discuss next steps and the medication plan after the pet is examined.
Front desk script: Because your dog is on Vetoryl and you’re seeing concerning signs, this could be an emergency. I’m alerting our medical team right now—please stay on the line. If your dog collapses, has bloody stool, very pale gums, or trouble breathing, go to the nearest emergency vet immediately and bring the medication bottle. Our veterinarian will advise you about the Vetoryl plan after the exam.
Why to ask about other meds: Vetoryl (trilostane) lowers cortisol and can also reduce aldosterone. Some drugs that affect blood pressure or electrolytes can add to these effects. If an owner mentions an ACE inhibitor (enalapril/benazepril), a potassium‑sparing diuretic (spironolactone), ketoconazole, mitotane (Lysodren), or potassium supplements/salt substitutes, flag to the veterinarian the same day. These combinations can raise the risk of electrolyte problems or excessive adrenal suppression and need clinician review and monitoring; your veterinarian can discuss the plan and timing. [Note: dogs previously on mitotane typically require a washout period before Vetoryl is started—tell the veterinarian if the owner mentions recent mitotane.]
Commonly co‑prescribed meds you may hear about: heart medications (ACE inhibitors, furosemide, pimobendan), insulin for diabetic dogs, and anti‑inflammatories prescribed by a vet. Always document all prescription and over‑the‑counter items and escalate if you hear any of the red‑flag meds above. In diabetic dogs, controlling Cushing’s can change insulin needs; if the owner reports signs that could fit low blood sugar (sudden weakness, wobbliness, trembling), or signs of Vetoryl over‑effect (vomiting, diarrhea, severe lethargy, collapse), treat this as urgent and involve a veterinarian immediately. For OTC items owners often give (antihistamines like diphenhydramine, fish oil/joint supplements, probiotics, melatonin/CBD, multivitamins), record everything and let the veterinarian decide; also ask specifically about human pain relievers—ibuprofen/naproxen are unsafe for dogs and any use should be escalated to a veterinarian or ER right away. Your veterinarian can advise which combinations are appropriate and what monitoring is needed.
Front desk script: Thanks for letting us know about the other medications and supplements—I'll add them to your pet’s chart. Because your dog is on Vetoryl, I’m going to flag this for the veterinarian to review today, especially since you mentioned [ACE inhibitor/spironolactone/ketoconazole/mitotane/potassium product]. If your dog is acting weak, collapsing, not eating, or having vomiting or diarrhea, please come in now or go to the nearest emergency clinic and I’ll alert our doctor. Otherwise, the doctor will review and let you know if any tests or changes are needed.
Store Vetoryl (trilostane) capsules at room temperature around 77°F; short excursions between 59–86°F are permitted during transport and owner pickup. Keep out of reach of children and other pets. Capsules are for dogs only; wash hands after handling. Do not open or split capsules. People who are pregnant or trying to conceive should not handle the capsules. Your veterinarian can discuss any special storage needs for the household.
Shelf life after opening: the U.S. package insert does not list a shorter “use-by after opening” period for Vetoryl capsules. Follow the labeled expiration date on the package and any beyond-use date on your clinic/pharmacy label. If a capsule is damaged or broken, avoid contact and call the clinic for guidance; your veterinarian can advise on replacement and safe cleanup.
Disposal: Encourage owners to use a drug take‑back program. If take‑back isn’t available, FDA recommends mixing unused capsules (do not crush) with an unpalatable substance (e.g., used coffee grounds or cat litter), sealing the mixture in a container, and placing it in household trash; remove personal info from packaging. Do not flush unless specifically directed by FDA. If a person or another pet swallows Vetoryl, seek medical care or contact Poison Control immediately, and notify the veterinarian.
Typical follow-up for dogs on Vetoryl includes a recheck about 10–14 days after starting the medication or after any dose change your veterinarian makes, then at about 30 days, 90 days, and every 3 months long term. These visits generally include a history and exam plus bloodwork (chemistry with electrolytes) and a timed ACTH stimulation test to assess response. Your veterinarian can confirm exactly which tests are needed and the timing for each patient.
The ACTH stimulation test is time-sensitive. It is usually scheduled so blood is drawn 4–6 hours after the dog receives the Vetoryl dose with food. When booking, plan a morning drop-off and coordinate feeding/dosing time with the care team; we will give you exact instructions so the timing is correct and let you know about same-day pickup.
Escalate immediately if the pet has concerning signs such as vomiting, diarrhea (especially bloody), not eating, marked lethargy/weakness, or collapse—advise the owner to contact us right away or proceed to the nearest emergency clinic. The veterinarian will advise on next steps and any testing that may be needed.
Front desk script: For Vetoryl monitoring, we schedule a recheck about 10–14 days after starting or after any veterinarian-directed dose change, then at 30 days, 90 days, and every 3 months. These visits include bloodwork and a timed ACTH stimulation test. Because the test must be 4–6 hours after the Vetoryl dose with food, we’ll give you exact feeding and drop‑off instructions when we book. If your dog is not eating, is vomiting or has diarrhea, seems very weak, or collapses, please contact us immediately or go to the nearest emergency clinic.
Vetoryl (trilostane) is a prescription medication used to manage Cushing’s disease in dogs. It works by reducing the body’s production of cortisol. Capsules should be given with food, kept intact (do not open or split), and handled carefully; wash hands after handling and pregnant individuals should avoid contact. Your veterinarian will determine the dosing plan and monitoring schedule.
Common early effects can include decreased appetite, vomiting, diarrhea, or low energy. Red flags that may signal a serious problem include repeated vomiting or diarrhea, bloody stool, extreme lethargy/weakness, shaking/tremors, collapse, or not eating. If any of these occur, treat it as an emergency and arrange immediate veterinary care; your veterinarian can advise about next steps and the medication plan. Front desk staff should avoid giving dosing advice, recommending starting or stopping medication, or minimizing the need for lab rechecks—those decisions are strictly the veterinarian’s.
Front desk script: Thank you for calling [Clinic Name], this is [Your Name]—are you calling about Vetoryl for your dog? The short answer is that Vetoryl helps manage Cushing’s and should be given with food at the same time each day; the capsules shouldn’t be opened. For dosing, side effects, or any changes, our veterinarian will guide you—let me bring a nurse/doctor on the line. If your dog is weak, collapsing, not eating, or having repeated vomiting/diarrhea or bloody stool, this is an emergency; please head to the nearest emergency hospital now and I can give you the address. I can also help schedule your recommended recheck bloodwork today; and just so you know, I can’t advise you to change, skip, or give extra Vetoryl—only the doctor can make that call.