# Amlodipine for Dogs: Dosage, Uses, and Side Effects Amlodipine for dogs dosage is not a number you pick off a chart. Your veterinarian calculates it from your dog's weight, blood pressure readings, and other health conditions, then adjusts it over time. Most dogs start on a low dose and get rechecked to see whether the pressure has come down enough. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - Amlodipine is a blood pressure medicine, and in dogs it is most often used to treat high blood pressure linked to kidney disease or heart disease. - A commonly used starting dose in one canine study was 0.1 mg/kg given by mouth twice daily [1]. Your veterinarian may start higher or lower depending on your dog. Never split a tablet unless your veterinarian tells you the exact amount to give. - The dose is not fixed. It gets adjusted based on blood pressure measurements taken at recheck visits, so keep every follow-up appointment. - Never change the dose or stop the medicine on your own. Sudden changes can cause blood pressure to swing in either direction. ## What Amlodipine Is and What Veterinarians Use It For Amlodipine is a calcium channel blocker. It relaxes the smooth muscle in blood vessel walls, which widens the vessels and lowers blood pressure. In veterinary medicine it is used mainly to bring down systemic hypertension, the medical term for persistently high blood pressure. High blood pressure damages what veterinarians call target organs. In dogs, the kidneys, eyes, brain, and heart are the organs most at risk when pressure stays elevated. That is why a high reading on a blood pressure monitor is treated as a real problem and not just a number. The most common reason a dog develops high blood pressure is chronic kidney disease. A 2025 study looked at dogs with kidney disease that were treated with amlodipine and found changes in symmetric dimethylarginine, a kidney marker, after treatment started [2]. This does not mean amlodipine cures kidney disease. It means controlling blood pressure may help the kidneys work under less strain. Amlodipine is also being studied in dogs with myxomatous mitral valve degeneration, a common heart valve problem in small breeds. In one study of 24 dogs with stage B2 or higher disease, adding amlodipine reduced the volume of mitral regurgitation over 7 days [1]. That is a research finding, not a standard use for every dog with a heart murmur. Ask your veterinarian whether it applies to your dog. If your dog also takes heart medication, the dosing logic for those drugs is different. You can read more about weight-based heart dosing in our guide to [Pimobendan Vetmedin Cardiac Dose: Weight-Based CHF Dog Dosing Chart](/knowledge/veterinary-medicine/calculators-clinical-tools/pimobendan-vetmedin-cardiac-dose-weight-based-chf-dog-dosing-chart). ## How Amlodipine Works Amlodipine blocks calcium from entering the muscle cells in the walls of your dog's arteries. With less calcium moving into those cells, the muscle stays relaxed instead of tightening. Relaxed arteries are wider arteries, and wider arteries mean lower pressure inside them. The drug acts mostly on the arteries, not on the heart's pumping strength. That is one reason it is often chosen when a dog has both high blood pressure and a heart condition. It lowers the pressure the heart has to push against without directly changing how hard the heart contracts. Amlodipine also affects hormone systems that regulate blood pressure. In a 2024 study of healthy cats, amlodipine treatment was linked to a median 44 percent increase in plasma renin concentration compared with placebo [3]. Renin is part of the renin-angiotensin-aldosterone system, the body's main blood pressure control loop. This tells us the body responds to the drug by adjusting its own hormone signals, which is one reason recheck measurements matter more than the starting dose. ## Amlodipine for Dogs Dosage: The Basics ### Who Decides the Dose Your veterinarian decides the dose. There is no universal chart you can follow at home, because the right dose depends on your dog's blood pressure, kidney values, other medications, and how your dog responded to the last dose. For context, one study of dogs with mitral valve disease used amlodipine at 0.1 mg/kg given by mouth twice daily for 7 days, added on top of the dogs' existing medications [1]. That is a real number from a real study, and it is a reasonable reference point. It is not a prescription. Your veterinarian may start at that level or choose a different starting point based on your dog's situation. ### How the Dose Is Given Amlodipine is given by mouth, usually once or twice daily. It can be given with or without food. If your dog gets carsick or vomits easily, ask your veterinarian whether to give it with a small meal. Tablets come in several strengths. Uneven pieces mean uneven doses, and amlodipine has a narrow enough margin that this matters. If your dog is on other medications, the same principle applies across the board. Our guide to [Antibiotic Dosage Calculation for Dogs: A Practical Guide](/knowledge/veterinary-medicine/clinical-pharmacology/antibiotic-dosage-calculation-dogs-practical-guide) explains how veterinarians think through weight-based dosing in general. ### What to Do About a Missed Dose If you miss a dose, give it when you remember, unless it is almost time for the next one. In that case, skip the missed dose and go back to your regular schedule. Do not double up to make up for a missed pill. If you miss more than one dose in a row, call your veterinarian. Blood pressure can climb back up when the medicine is stopped, and your veterinarian may want to check a reading before you restart. ## Side Effects of Amlodipine in Dogs Most dogs tolerate amlodipine well, especially at low starting doses. Side effects tend to show up when the dose is too high for that dog, which is one reason veterinarians start low and adjust. | Side effect | How common or serious | What to do | |---|---|---| | Low blood pressure (weakness, wobbliness, collapse) | Uncommon but serious | Call your veterinarian right away. If your dog cannot stand or seems faint, treat it as an emergency | | Swollen or puffy gums | Uncommon, usually mild | Mention it at the next visit. It often improves as the body adjusts | | Vomiting or reduced appetite | Uncommon, usually mild | Offer a small meal with the pill. Call your veterinarian if it lasts more than a day | | Lethargy or unusual sleepiness | Uncommon | Note the timing. If it happens within a few hours of the dose, tell your veterinarian | | Fast heart rate or restlessness | Uncommon | Call your veterinarian. This can be a sign the dose needs adjusting | | Worsening kidney values on bloodwork | Possible, found on recheck testing | This is why recheck bloodwork matters. Your veterinarian will interpret it in context | The most important thing to watch for is low blood pressure. Signs include stumbling, weakness, pale gums, and a dog that seems disconnected from what is happening around it. That is not a wait-and-see situation. ## Who Should Not Take Amlodipine and What Interacts With It Amlodipine is not right for every dog. Your veterinarian will weigh the risks if your dog has very low blood pressure already, certain heart rhythm problems, or severe liver disease. Dogs that are dehydrated or in shock should not start this medicine until they are stable. Drug interactions matter. Amlodipine is often combined with other blood pressure medicines, and the combination can drop pressure too far if the doses are not balanced. Tell your veterinarian about every product your dog takes, including prescriptions, over-the-counter pills, and supplements. Some interactions are easy to overlook. A 2026 study in dogs with osteoarthritis found that cannabidiol exposure was higher when it was given alongside carprofen, though the difference in peak concentration and total exposure did not reach statistical significance [4]. The point is not that these two drugs are dangerous together. The point is that what you give alongside a prescription can change how much of it ends up in your dog's bloodstream, and your veterinarian needs the full list. If your dog takes a medication for itching or allergies, dosing rules differ from blood pressure drugs. Our guide to [Apoquel Oclacitinib Daily Dose: Itch Relief Dosing Chart for Dogs](/knowledge/veterinary-medicine/calculators-clinical-tools/apoquel-oclacitinib-daily-dose-itch-relief-dosing-chart-for-dogs) covers that separately. ## Overdose: What to Do Right Now An amlodipine overdose can cause a dangerous drop in blood pressure. Signs include severe weakness, collapse, cold limbs, a very slow or very fast heart rate, vomiting, and unresponsiveness. If you think your dog ate extra tablets, call your veterinarian or an emergency clinic immediately. Do not wait for symptoms to appear. Bring the pill bottle with you so the team knows the strength and how many tablets are missing. You can also call poison control for animals. Have your dog's weight, the tablet strength, and the approximate number of tablets swallowed ready before you call. Do not try to make your dog vomit unless a veterinarian tells you to. With a blood pressure medicine, the bigger risk is collapse, and vomiting at home can make that worse. ## Limitations and When to Contact a Veterinarian Amlodipine dosing is not a one-time calculation. It is a cycle of measure, treat, and re-measure. A dose that controls pressure in one dog may be too high or too low in another dog of the same weight, because kidney function, heart disease, and individual drug response all shift the target. Call your veterinarian the same day if your dog vomits the dose, refuses food for more than a day, seems weak or wobbly, or if you miss more than one dose. Go to an emergency clinic now if your dog collapses, cannot stand, has pale or white gums, breathes rapidly at rest, or does not respond to you normally. Keep routine recheck visits even when your dog seems fine. High blood pressure often causes no visible signs until an organ is already damaged, so the recheck is the main way your veterinarian knows the dose is right. Individual cases need a veterinarian who can examine your dog and interpret the numbers in context. ## Frequently Asked Questions ### Can I split a 2.5 mg amlodipine tablet for my dog? Only if your veterinarian tells you to and shows you the exact fraction to give. A pill cutter works better than a knife. ### How often does my dog need blood pressure rechecks? Your veterinarian will set the schedule, and it usually starts sooner after a dose change and spreads out once readings are stable. Rechecks often pair a blood pressure measurement with bloodwork to check kidney values. Missing these visits is the most common reason dosing goes off track. ### Can amlodipine be given with other heart or kidney medications? Yes, it is often combined with other drugs, and that is exactly why your veterinarian needs a complete medication list. Combinations can lower pressure more than either drug alone. Never add a new product without asking first. ### What happens if I stop giving amlodipine suddenly? Blood pressure can rise again, sometimes quickly, and that puts the kidneys, eyes, and brain back at risk. If you want to stop or change the dose, call your veterinarian first. They can plan a safe transition. ### Is amlodipine the same dose for dogs and cats? No. Dogs and cats are dosed differently, and cat doses are not a guide for dogs. Even within dogs, the dose depends on weight and the condition being treated. Follow only the instructions written for your dog. ### Does amlodipine help kidney disease in dogs? It may help by lowering blood pressure, which reduces strain on the kidneys. A 2025 study found changes in a kidney marker in dogs with chronic kidney disease treated with amlodipine [2]. It is not a cure for kidney disease, and it does not replace kidney-specific care. ### Can I give my dog amlodipine for a seizure or for pain? No. Amlodipine is a blood pressure medicine and does nothing for seizures or pain. If your dog needs help with seizures or post-surgery rest, those are different drugs with different dosing rules, such as the ones covered in our guide to [Trazodone Dosage for Dogs: Calming Post-Surgery Rest Dose by Weight](/knowledge/veterinary-medicine/calculators-clinical-tools/trazodone-dosage-for-dogs-calming-post-surgery-rest-dose-by-weight). ## Related Articles - [Pimobendan Vetmedin Cardiac Dose: Weight-Based CHF Dog Dosing Chart](/knowledge/veterinary-medicine/calculators-clinical-tools/pimobendan-vetmedin-cardiac-dose-weight-based-chf-dog-dosing-chart) - [Apoquel Oclacitinib Daily Dose: Itch Relief Dosing Chart for Dogs](/knowledge/veterinary-medicine/calculators-clinical-tools/apoquel-oclacitinib-daily-dose-itch-relief-dosing-chart-for-dogs) - [Amoxicillin Dog Cat Dose: Broad-Spectrum Antibiotic Weight-Based Guide](/knowledge/veterinary-medicine/calculators-clinical-tools/amoxicillin-dog-cat-dose-broad-spectrum-antibiotic-weight-based-guide) - [Trazodone Dosage for Dogs: Calming Post-Surgery Rest Dose by Weight](/knowledge/veterinary-medicine/calculators-clinical-tools/trazodone-dosage-for-dogs-calming-post-surgery-rest-dose-by-weight) - [Antibiotic Dosage Calculation for Dogs: A Practical Guide](/knowledge/veterinary-medicine/clinical-pharmacology/antibiotic-dosage-calculation-dogs-practical-guide) - [Benadryl Diphenhydramine for Dogs: Weight-Based Dosing for Allergies](/knowledge/veterinary-medicine/calculators-clinical-tools/benadryl-diphenhydramine-for-dogs-weight-based-dosing-for-allergies) - [Amlodipine Side Effects in Dogs: What to Watch](/knowledge/veterinary-medicine/pet-medication-guide/amlodipine-side-effects-dogs) - [Amlodipine for Dogs and Cats: Uses and Safety](/knowledge/veterinary-medicine/pet-medication-guide/amlodipine-dogs-cats) - [Benazepril for Dogs: Side Effects, Dosage and Monitoring](/knowledge/veterinary-medicine/pet-medication-guide/benazepril-dogs-side-effects) ## References 1. [Amlodipine decreases mitral regurgitation volume in dogs over 7 days: A study of 24 dogs with myxomatous mitral valve degeneration](https://pubmed.ncbi.nlm.nih.gov/35414938/). Veterinary record open, 2022. 2. [Amlodipine improves symmetric dimethylarginine in dogs with chronic kidney disease](https://pubmed.ncbi.nlm.nih.gov/40370820/). Frontiers in veterinary science, 2025. 3. [Effect of amlodipine on the circulating renin-angiotensin-aldosterone system in healthy cats](https://pubmed.ncbi.nlm.nih.gov/38334012/). Journal of veterinary internal medicine, 2024. 4. [Pharmacokinetics of Buccally Administered Cannabidiol and Oral Carprofen During Single- and Repeated-Dose Administration in Dogs](https://pubmed.ncbi.nlm.nih.gov/42813543/). Journal of veterinary pharmacology and therapeutics, 2026. ## Further Reading - [American Veterinary Medical Association: First Aid Tips for Pet Owners](https://www.avma.org/resources-tools/pet-owners/emergencycare/first-aid-tips-pet-owners) - [Merck Veterinary Manual: Dog Owners](https://www.merckvetmanual.com/dog-owners) - [Cornell Richard P. Riney Canine Health Center: Canine Health Information](https://www.vet.cornell.edu/departments-centers-and-institutes/riney-canine-health-center/canine-health-information)