Which medications can increase the risk of renal toxicity in pets?

Certain pain relievers, non-steroidal anti-inflammatory drugs (NSAIDs), and some antibiotics can place extra strain on the kidneys. Risk depends on dose and individual variation — consult your vet if you have concerns.

What tests will the vet use to confirm kidney damage?

Routine tests include blood biochemistry, a complete blood count, and urinalysis. Ultrasound or X-rays are used to assess kidney structure, and further specialist investigations may be arranged if needed.

How should I monitor my pet at home, and when should I return for a follow-up?

Observe and record vomiting episodes, water intake, and changes in urine output. If symptoms persist or you notice lethargy or reduced urination, follow your vet's instructions and seek care promptly.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Drug-Induced Renal Toxicity in Dogs & Cats: Symptoms, Kidney Tests & Care Guide [2025]

Drug-induced renal toxicity is commonly caused by antibiotics, NSAIDs, or chemotherapy agents, requiring prompt discontinuation of the drug and IV fluid support to protect kidney function.

Take 1 minute to check the symptoms first

Last updated: 2026/01/06

Pethealthmap Editorial Team

Sources: IRIS, ACVIM, National Taiwan University Veterinary Hospital

When to See a Vet

Seek immediate veterinary care (emergency)

•Persistent, frequent vomiting that will not stop, with growing weakness
•Little or no urination together with obvious dehydration
•Extreme lethargy with no clear response to stimulation

Arrange a clinic visit soon (within 24–72 hours)

•Vomiting or diarrhea lasting more than twenty-four hours
•A noticeable change in water intake along with abnormal appetite
•A change in urine color or frequency accompanied by other symptoms

01What symptoms signal a problem?

Drug-induced renal toxicity in dogs and cats typically presents with gastrointestinal signs alongside urinary or behavioural changes, and the clinical picture varies with the degree of kidney injury.

Repeated vomiting or increased frequency of vomiting
Diarrhoea or changes in stool consistency and frequency
Abnormal urine output (increased urination or noticeably reduced output)
Increased water intake or signs of dehydration
Lethargy and a marked decrease in activity level

Seek emergency care immediately if you notice the following symptoms:

⚠️ Persistent vomiting, markedly reduced urine output, or extreme lethargy may indicate serious kidney impairment — seek veterinary assessment immediately.

02How to assess what you're seeing at home: key observations and when to go to emergency

Tracking these key observations before your vet visit helps the vet assess the condition faster and arrange the necessary tests.

Record the number of vomiting episodes, timing, and what was vomited
Film short clips of vomiting episodes or your pet's activity level on your phone
Weigh your pet and track daily water intake
Note the frequency and appearance of urination and defecation (including blood in urine or unusual colour)
Observe any changes in alertness, appetite, and activity
If symptoms persist or worsen, arrange a vet appointment promptly

03How will the vet make a diagnosis? Common diagnostic tests

After arrival, your vet will use a combination of tests to evaluate kidney function and overall health, using imaging or histology when needed to confirm the cause and extent of injury.

Full physical examination to assess body condition, pain, and hydration status

Blood biochemistry to evaluate kidney markers (e.g. creatinine, blood urea nitrogen)

Complete blood count to detect signs of dehydration or infection

Urinalysis including specific gravity, protein levels, and microscopic examination

Imaging (ultrasound or CT) to assess kidney size and structure

Kidney biopsy may be arranged when necessary for histological diagnosis

04How is it treated and managed after diagnosis? Medications, dietary adjustments, and care guide

Treatment focuses on supporting kidney function and removing or stopping the suspected drug, with close ongoing monitoring of blood and urine biochemistry and clinical response.

Intravenous fluid therapy to maintain circulation and fluid balance
Discontinue the suspected causative drug and have a vet or specialist reassess the treatment plan
Adjust the diet to support kidney health, or switch to a prescription renal diet as directed
Monitor urine output, water intake, and body weight at home
Schedule regular blood and urine biochemistry follow-ups as advised
If symptoms or test results worsen, seek referral to a specialist hospital promptly

05What to prepare before your vet visit: the key to helping your vet pinpoint the cause quickly

Note the timeline of onset and a detailed account of the first symptoms

Compile a full list of all medications and supplements your pet is taking (including formulation and dosage)

Bring any recent blood or urine test reports if available

If possible, bring a fresh urine sample for on-site testing

Record the timing and frequency of symptoms — video is especially helpful

Call ahead to inform the clinic of any medications given or treatments already tried

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.

Related Symptoms (You May Also Be Looking For)

Decreased activity

Fluid deficit

Bad breath

Loss of appetite

Loose stool

Mouth sores