Opioid Analgesic (Atypical) · For Cats

Ultram dosage reference for cats (Tramadol)

This page's standard weight-based reference is 2 mg per kg (0.91 mg per lb), with Every 12 hours recorded as the reference frequency. Use the calculator to see the arithmetic for your cat's weight, then confirm the indication, product, and actual dose with a veterinarian.

Onset: 30-60 minutes
Duration: 6-12 hours
Class: Opioid Analgesic (Atypical)

Weight-based calculator estimate from the references listed on this page. This page has not been independently DVM-reviewed — see our methodology .

This information is for educational purposes only. Always consult your veterinarian before giving medication to your pet. Do not use this calculator for emergencies, overdoses, pregnancy, very young animals, very old animals, pets with liver/kidney disease, or pets taking multiple medications.

Each medication page lists the references recorded for its data. The calculator math and editorial presentation are maintained by PetDosageChart; a page is independently DVM-reviewed only when a named reviewer byline appears. See our methodology and limitations.

Tramadol (often known by brand names such as Ultram) is an opioid analgesic (atypical) commonly used in veterinary medicine for Moderate to severe pain management, Post-surgical pain, Osteoarthritis pain, Cancer pain, and Chronic pain conditions. Understanding the correct dosage, administration, and potential side effects of Tramadol is critical for your cat’s safety and well-being.

A typical Tramadol dose for cats is around 2 mg/kg Every 12 hours, within a usual range of 1-4 mg/kg. Available forms include Tablet, Compounded liquid, and Compounded transdermal.

Calculator Warning: Use this only as an educational estimate. Your veterinarian may prescribe a different dose based on your pet’s condition, age, weight, other medications, and medical history.

Tramadol Dosage Calculator for Cats

Enter your cat’s weight below to estimate the Tramadol dose from the 2 mg/kg guideline. Your veterinarian may adjust it for your cat’s age, condition, and other medications, so treat the result as an educational starting point, not a prescription.

Dosage Calculator · 01

Enter your cat's weight

Quick Dosage Chart

Typical Tramadol amounts for common cat weights, for quick reference:

Dosage Chart · 02

Ultram weight-based reference chart for cats

Scroll sideways to see full table

Weight	Lower Reference	Standard Reference	Upper Reference	Frequency
3 lbs (1.4 kg)	1.4 mg	2.8 mg	5.6 mg	Every 12 hours
4 lbs (1.8 kg)	1.8 mg	3.6 mg	7.2 mg	Every 12 hours
5 lbs (2.3 kg)	2.3 mg	4.6 mg	9.2 mg	Every 12 hours
6 lbs (2.7 kg)	2.7 mg	5.4 mg	10.8 mg	Every 12 hours
7 lbs (3.2 kg)	3.2 mg	6.4 mg	12.8 mg	Every 12 hours
8 lbs (3.6 kg)	3.6 mg	7.2 mg	14.4 mg	Every 12 hours
9 lbs (4.1 kg)	4.1 mg	8.2 mg	16.4 mg	Every 12 hours
10 lbs (4.5 kg)	4.5 mg	9.0 mg	18.0 mg	Every 12 hours
12 lbs (5.4 kg)	5.4 mg	10.8 mg	21.6 mg	Every 12 hours
14 lbs (6.3 kg)	6.3 mg	12.6 mg	25.2 mg	Every 12 hours
16 lbs (7.3 kg)	7.3 mg	14.6 mg	29.2 mg	Every 12 hours
18 lbs (8.2 kg)	8.2 mg	16.4 mg	32.8 mg	Every 12 hours
20 lbs (9.1 kg)	9.1 mg	18.2 mg	36.4 mg	Every 12 hours
25 lbs (11.3 kg)	11.3 mg	22.6 mg	45.2 mg (50mg tablet)	Every 12 hours

Parenthetical tablet amounts are arithmetic comparisons only. They do not account for scoring, release type, concentration, product labeling, or whether this medication is appropriate for an individual animal.

By Weight

Ultram reference by cat weight

Choose a common weight to open its optional reference page. Use the main medication calculator for a different exact weight.

Common-weight pages are convenience views of the same educational reference, not separate medical recommendations.

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How to Give Tramadol to Your Cat

Tramadol is extremely bitter—this is the biggest challenge when giving it to cats. NEVER crush the tablet. If you must use tablets, cut to the prescribed dose, coat in butter or wrap in a pill pocket, and use a pill gun to place it at the back of the tongue. Follow immediately with a syringe of tuna water or low-sodium chicken broth to wash it down and mask any bitter taste. For long-term use, strongly consider asking your vet for a compounded flavored liquid or transdermal (ear gel) formulation, which avoids the taste issue entirely. Give with food to reduce nausea.

It is generally recommended to give Tramadol with food to help reduce stomach upset. It may interact with MAO inhibitors (risk of serotonin syndrome), SSRIs and other serotonergic drugs, CNS depressants (enhanced sedation), and Ondansetron (may reduce tramadol efficacy).

Side Effects and Safety

Common side effects include Sedation and drowsiness, Dilated pupils (mydriasis), Euphoria or dysphoria, Constipation, and Decreased appetite. More serious side effects can occur, such as Serotonin syndrome (when combined with other serotonergic drugs), Seizures, Severe respiratory depression, and Severe constipation or ileus.

Cautions · 12

When Ultram should be used with caution or avoided

Some cats should not take Ultram, or need a different dose and closer monitoring. Tell your veterinarian about your pet's full health history and every other medication or supplement they take before giving Ultram.

Concurrent use of MAO inhibitors
Seizure disorders
Severe liver or kidney disease
Known hypersensitivity to tramadol or opioids

Interactions · 13

Ultram drug interactions

Ultram can interact with other drugs. This list is not complete — always give your veterinarian a full list of your cat's medications and supplements.

MAO inhibitors (risk of serotonin syndrome)

SSRIs and other serotonergic drugs

CNS depressants (enhanced sedation)

Ondansetron (may reduce tramadol efficacy)

Calculator Limits · 14

When not to use this calculator

This calculator gives a general educational estimate for a healthy adult cat at a known weight. Do not rely on it in these situations — talk to your veterinarian instead:

In an emergency, or after accidental ingestion or a suspected overdose
For pregnant or nursing pets
For very young or very old cats
For pets with liver disease, kidney disease, or another chronic illness
For pets taking several medications at once
When you are not sure of your cat's current, accurate weight
For combination products that contain additional active ingredients

Overdose · 15

Suspected overdose: what to do

If you think your cat had too much Ultram, or swallowed any medication by accident, act right away. Do not wait for symptoms to appear.

Call your veterinarian or the nearest emergency animal hospital.
ASPCA Animal Poison Control Center: (888) 426-4435
Pet Poison Helpline: (855) 764-7661

A consultation fee may apply to the poison hotlines. Have the medication packaging ready, and note how much your pet may have taken and when. Do not try to make your pet vomit unless a veterinarian tells you to.

When to Call the Vet

If your cat experiences any of the following, contact your veterinarian or an emergency clinic immediately:

Extreme sedation, difficulty waking, or very slow breathing
Seizures or severe tremors
Agitation, vocalization, or signs of distress (possible dysphoria)
No bowel movement for more than 48 hours (severe constipation)
Vomiting or complete refusal to eat for more than 24 hours

Frequently Asked Questions

Frequently Asked · 07

Questions about this medication

Is tramadol effective for pain in cats?

Yes, tramadol is considered more effective in cats than in dogs for pain relief. Cats produce higher levels of the active metabolite (O-desmethyltramadol, or M1) that provides opioid-like pain relief. This makes tramadol a useful option for managing moderate to severe pain in cats, including post-surgical pain, arthritis, and cancer pain.

Why is tramadol so hard to give to cats?

Tramadol has an extremely bitter taste that cats find highly aversive. Even a brief taste can cause intense drooling, foaming, and head shaking. The standard 50 mg tablet is also quite large relative to cat doses. Compounded formulations (flavored liquids or transdermal gels) are strongly recommended for cats. If you must use tablets, give them whole—never crush—and follow with water or a treat immediately.

How much tramadol can I give my cat?

The typical tramadol dose for cats is 1-4 mg/kg given every 12 hours. For an average 4 kg cat, this is approximately 4-16 mg per dose. Since standard tablets are 50 mg, your vet will likely prescribe a fraction of a tablet or a compounded formulation for accurate dosing. Never adjust the dose without consulting your veterinarian.

Can tramadol cause dilated pupils in cats?

Yes, mydriasis (dilated pupils) is a very common and expected side effect of tramadol in cats. It is not harmful but can make your cat sensitive to bright light. This effect typically resolves as the medication wears off. If pupils remain dilated continuously or are accompanied by other neurological signs, contact your vet.

Is tramadol a controlled substance for cats?

Yes, tramadol is a Schedule IV controlled substance in the United States. Your vet will need to write a prescription for it, and there may be limitations on refills. Keep the medication securely stored away from children and other pets. Report any lost or stolen medication to your vet.

Use This Guide Safely · 08

What weight alone cannot tell you

The calculator performs one narrow job: it multiplies your cat's weight by the lower, standard, and upper mg/kg values recorded for Ultram. It cannot decide whether this drug, indication, formulation, or schedule is appropriate for an individual animal.

Context in this medication record

Commonly listed uses: Moderate to severe pain management, Post-surgical pain, Osteoarthritis pain, Cancer pain, Chronic pain conditions
Recorded forms: Tablet, Compounded liquid, Compounded transdermal
Reference timing: Every 12 hours; onset 30-60 minutes; duration 6-12 hours

Individual checks a calculator cannot perform

Confirm the diagnosis and the reason this medication is being considered.
Match the exact product, concentration, route, and whether a tablet may be split.
Account for age, pregnancy, organ function, genetics, allergies, and prior reactions.
Review every prescription, over-the-counter product, and supplement your pet takes.

Recorded cautions

Concurrent use of MAO inhibitors; Seizure disorders; Severe liver or kidney disease; Known hypersensitivity to tramadol or opioids.

Recorded interactions

MAO inhibitors (risk of serotonin syndrome); SSRIs and other serotonergic drugs; CNS depressants (enhanced sedation); Ondansetron (may reduce tramadol efficacy).

These lists reproduce the structured record used by this page and may not be exhaustive. Show your veterinarian the product label and your cat's complete medication list before acting on a number.

Related · 08

Related medications for cats

Sources · 09

Sources & references

The structured medication record behind this page names the references below. The links open the publisher or official resource; they do not turn this page into a prescription for an individual animal.

Plumb's Veterinary Drug Handbook — listed in this medication's source record.
Merck Veterinary Manual — listed in this medication's source record.
DailyMed label search for Tramadol — check current product and formulation labels; some veterinary uses may be off-label.

Source names are shown at the record level; passage-level page and label citations are still being added. Read our methodology and limitations.

Transparency · 11

How this page was made

This page's structured medication record includes Plumb's Veterinary Drug Handbook among its source names. PetDosageChart applies the record's mg/kg values to the entered weight and presents the arithmetic result. A source record is not the same as an individualized prescription or an independent clinical review.

Sources cited: Plumb's Veterinary Drug Handbook
Merck Veterinary Manual
Calculator formula: Doses scale linearly from a standard basis of 2 mg per kg (0.91 mg per lb) of body weight, given Every 12 hours. The calculator multiplies that basis by your cat's weight and shows an arithmetic comparison with recorded tablet sizes. That comparison does not determine whether a tablet is scored, splittable, or appropriate for your pet.
Editorial owner: Prepared and maintained by the PetDosageChart editorial team, a software-led publisher and not a veterinary practice.
DVM review status: Not independently DVM-reviewed. A named reviewer and review date appear here only after a confirmed review.

More on our methodology and editorial process — how we source, calculate, and review cats dosage data.

Safety · 10

More resources

Pet Medication Safety Hub — What's safe, what's dangerous, and emergency signs
How we calculate dosages — Our sources, math, and review process
Printable emergency checklist — One-page reference for your fridge or first aid kit