# Drontal for Dogs: Dosage, Frequency, and Safety Drontal for dogs dosage depends on your dog's body weight, and the tablet is usually repeated once after 2 to 3 weeks to clear the infection. Getting the weight right matters, and getting the timing right matters just as much. Many owners give the first dose correctly and then skip the follow-up, which lets the worms come back. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - Drontal is a dewormer that treats common intestinal worms in dogs, including roundworms, hookworms, and tapeworms. - Your veterinarian calculates the dose from your dog's exact weight, so a 12-pound dog and a 60-pound dog get very different amounts. - The first dose kills adult worms. A second dose 2 to 3 weeks later catches worms that were still developing at the time of the first dose. - For prevention, most healthy adult dogs are dewormed on a schedule set by their veterinarian, often every 3 to 6 months, depending on lifestyle and risk. - Never split or guess at tablets based on a human dose. Call your veterinarian if you are unsure. ## What Drontal Is and What Veterinarians Use It For Drontal is a combination deworming tablet. The version sold for dogs contains three active ingredients: febantel, pyrantel pamoate, and praziquantel [1]. Each ingredient targets a different group of worms, which is why the combination covers more ground than a single drug. Veterinarians use it to treat intestinal helminths, the technical term for worms that live in the gut. The most common targets are roundworms (Toxocara canis), hookworms (Ancylostoma caninum), and tapeworms [2]. Roundworms and hookworms are zoonotic, meaning they can infect people too, so treating your dog also protects your household [2]. Dogs in rural areas and hunting dogs face a higher risk of intestinal worm infections than dogs who stay in the yard [3]. That does not mean house dogs are safe. Puppies, dogs who visit dog parks, dogs who eat grass or dirt, and dogs with fleas all have real exposure risk. ## How Drontal Works Each ingredient works in a slightly different way, but the end result is the same. The worms lose their grip on the intestinal wall or are paralyzed, and they pass out in the stool. Praziquantel acts on tapeworms. Pyrantel pamoate acts on roundworms and hookworms. Febantel covers additional roundworm and hookworm stages. Because the drugs act on the worms instead of on your dog's body, side effects tend to be mild and short-lived. One interesting finding: worm infection itself changes the bacteria living in a dog's gut. In one study, the diversity and abundance of intestinal microbiota dropped with roundworm infection and rose again after deworming treatment [1]. So treating worms may help your dog's gut get back to normal. ## Drontal for Dogs Dosage: How the Dose Is Decided This is the part owners most often get wrong. Drontal is not dosed by age, breed, or how big your dog looks. It is dosed by weight. ### Who decides the dose Your veterinarian does. They weigh your dog on a clinic scale, review your dog's health history, and pick the tablet size or combination that matches. Puppies, pregnant dogs, and dogs with liver or kidney problems may need a different plan. Weight-based dosing is standard across veterinary medicine. Many drugs are calculated from body weight, and the same principle applies to dewormers. If you want to see how weight-based dosing works in other situations, this [antibiotic dosage calculation guide for dogs](/knowledge/veterinary-medicine/clinical-pharmacology/antibiotic-dosage-calculation-dogs-practical-guide) walks through the math. ### Drontal for dogs dosage chart by weight The table below shows the general weight bands used for Drontal tablets. Your veterinarian will confirm the exact product and number of tablets for your dog. | Dog's weight | Typical tablet approach | |---|---| | 2 to 5 lb (puppies and toy breeds) | Small tablet or partial dose, veterinarian decides | | 6 to 25 lb | 1 small dog tablet | | 26 to 60 lb | 1 large dog tablet | | Over 60 lb | Multiple tablets, calculated by weight | Do not use this table as a substitute for your veterinarian's instructions. Tablet strengths vary by product and by country, and a dose that is right for one dog can be too low or too high for another. ### How it is given Drontal comes as a flavored tablet that most dogs take willingly. You can give it with a small amount of food or place it directly in the mouth. Fasting is not required. If your dog spits it out or vomits within a couple of hours, call your veterinarian. The dose may need to be repeated. ### What to do about a missed dose If you forget the follow-up dose, give it as soon as you remember, as long as it has not been too long. If more than a few weeks have passed, your veterinarian may want to restart the schedule or check a stool sample. Do not double up to make up for lost time. ## Drontal for Dogs: How Often and How Many Days This is the question that trips up the most owners. The answer has two parts: treatment and prevention. ### Treatment: the 2 to 3 week retreatment rule When your dog has an active worm infection, the first dose kills the adult worms living in the gut at that moment. It does not kill larvae that are still migrating through the body or developing in the environment. That is why the dose is repeated. Giving the second dose 2 to 3 weeks after the first catches those worms once they mature into adults. In field studies of Drontal in naturally infected dogs, fecal egg counts were tracked at day 0, day 7, and day 14 after treatment to confirm the worms were cleared [3]. That two-week window is the reason the retreatment timing matters. So the answer to "how many days" is simple: treatment is usually two doses, spaced 2 to 3 weeks apart, not several days in a row. ### Prevention: how often to deworm a healthy dog For ongoing prevention, the schedule depends on your dog's risk. Puppies are typically dewormed more often because they can pick up roundworms from their mother. Adult dogs with average risk are often dewormed every 3 to 6 months. Dogs with high exposure, such as hunting dogs or dogs who eat prey, may need more frequent treatment [3]. Your veterinarian will set the schedule based on your dog's age, lifestyle, and local parasite risk. Real-world data shows that antiparasitic use in dogs is concentrated in a small number of products, and combination dewormers are among the most commonly used [4]. That reflects how routine deworming has become in general practice. If your dog is also on other medications, it helps to understand how veterinarians manage multiple drugs at once. This [trazodone dosing guide for dogs](/knowledge/veterinary-medicine/calculators-clinical-tools/trazodone-dosage-for-dogs-calming-post-surgery-rest-dose-by-weight) shows how weight and timing interact for a very different kind of drug. ## Side Effects of Drontal in Dogs Most dogs tolerate Drontal well. When side effects happen, they are usually mild and short-lived. | Side effect | How common or serious | What to do | |---|---|---| | Vomiting | Uncommon, usually mild | Withhold food for a few hours, offer water. Call your vet if it continues past 24 hours. | | Diarrhea | Uncommon, usually mild | Keep water available. Call your vet if it lasts more than a day or contains blood. | | Drooling or lip smacking | Common right after dosing, not serious | It often means the tablet tasted bitter. Offer a small treat. | | Loss of appetite | Uncommon, mild | Offer bland food. Call your vet if your dog refuses food for more than 24 hours. | | Lethargy | Uncommon, mild | Let your dog rest. Call your vet if your dog seems weak or unresponsive. | | Allergic reaction (swelling, hives, trouble breathing) | Rare but serious | This is an emergency. Call your veterinarian or an emergency clinic right away. | | Neurologic signs (wobbling, tremors, seizures) | Rare but serious | Stop the medication and seek veterinary care immediately. | If your dog has ever reacted badly to a dewormer, tell your veterinarian before the next dose. ## Who Should Not Take Drontal and What Interacts With It Drontal is not right for every dog. Your veterinarian will weigh the risks in these situations. - **Pregnant or nursing dogs.** Some dewormers are used in pregnancy, but the decision belongs to your veterinarian. Do not dose a pregnant dog on your own. - **Very young puppies.** Age and weight minimums apply. A veterinarian should set the dose. - **Dogs with liver or kidney disease.** These organs process medication. A dog with impaired function may need a different product or a lower dose. - **Dogs taking other dewormers.** Giving two deworming products at once can double up on the same drug class. Tell your veterinarian about everything your dog takes, including over-the-counter products and flea and tick preventives. - **Collies and related breeds.** Some herding breeds carry a genetic sensitivity to certain drugs. Drontal's ingredients are generally considered safe for these breeds, but your veterinarian should confirm. Drug interactions are one reason to keep a complete medication list. The same principle applies to any prescription, whether it is a dewormer or something like [Apoquel for itch relief](/knowledge/veterinary-medicine/calculators-clinical-tools/apoquel-oclacitinib-daily-dose-itch-relief-dosing-chart-for-dogs). ## Overdose and When to Call for Help Giving too much Drontal can cause vomiting, diarrhea, drooling, wobbling, or tremors. The risk goes up if a dog eats multiple tablets or if a small dog gets a large dog's dose. If you suspect an overdose, call your veterinarian right away. You can also call the ASPCA Animal Poison Control Center at (888) 426-4435 or the Pet Poison Helpline at (855) 764-7661. Both are available 24 hours a day and may charge a consultation fee. Do not wait for symptoms to appear. Early treatment is easier and safer than waiting. ## Limitations and When to Contact a Veterinarian Deworming is not a one-size-fits-all task, and every dog's situation is different. Your veterinarian is the only person who can decide what your dog needs. Call your veterinarian the same day if: - Your dog vomits the tablet within 2 hours of taking it. - Your dog has diarrhea that lasts more than 24 hours. - Your dog refuses food for more than a day. - You are not sure whether your dog got the full dose. Go to an emergency clinic right away if: - Your dog has trouble breathing, facial swelling, or hives. - Your dog has a seizure, tremors, or cannot stand. - Your dog collapses or becomes unresponsive. Schedule a routine visit if: - You see worms in your dog's stool or around the tail. - Your dog has a potbelly, dull coat, or ongoing weight loss. - You need a prevention schedule for a new puppy. - You are unsure how often to deworm based on your dog's lifestyle. ## Frequently Asked Questions ### Can I give my dog Drontal two days in a row? No. Treatment is usually two doses spaced 2 to 3 weeks apart, not back-to-back days. Giving doses too close together does not kill more worms and raises the chance of side effects. Follow the schedule your veterinarian gives you. ### What happens if I give the second dose too early or too late? Too early and the larvae may not have matured yet, so the dose misses them. Too late and those worms may already be shedding eggs back into your home and yard. If your timing was off, call your veterinarian for guidance on whether to repeat the dose. ### Can I use Drontal on a puppy? Puppies are often dewormed, but the dose and timing depend on age and weight. Your veterinarian will set a schedule that fits your puppy's size. Never guess at a puppy dose from an adult tablet. ### Do I need a prescription for Drontal? In the United States, Drontal is generally sold through veterinarians or with a prescription. Some deworming products are available over the counter, but they may not cover the same worms. Your veterinarian can tell you which product fits your dog's needs. ### Can my dog get worms again after treatment? Yes. Deworming treats the infection your dog has now. It does not prevent future exposure. Dogs pick up worms from soil, stool, fleas, and prey, so prevention depends on a regular schedule plus good hygiene, like picking up stool promptly and controlling fleas. ## 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) - [Antibiotic Dosage Calculation for Dogs: A Practical Guide](/knowledge/veterinary-medicine/clinical-pharmacology/antibiotic-dosage-calculation-dogs-practical-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) - [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) - [Cephalexin Weight-Based Antibiotic Dose Calculator: Veterinary Dosage Guide](/knowledge/veterinary-medicine/calculators-clinical-tools/cephalexin-weight-based-antibiotic-dose-calculator-veterinary-dosage-guide) - [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) - [Drontal for Cats: Dosage, Schedule, and How Often](/knowledge/veterinary-medicine/parasitic-diseases/drontal-for-cats-dosage) - [Drontal for Dogs Side Effects: What to Watch For](/knowledge/veterinary-medicine/pet-medication-guide/drontal-dogs-side-effects) - [Drontal for Dogs: Active Ingredients and What They Kill](/knowledge/veterinary-medicine/pet-medication-guide/drontal-dogs-active-ingredients) ## References 1. [Regulation Effect of Toxocara canis and Anthelmintics on Intestinal Microbiota Diversity and Composition in Dog](https://pubmed.ncbi.nlm.nih.gov/39458346/). Microorganisms, 2024. 2. [Field efficacy and safety evaluation of a novel chewable tablet (Credelio Quattro™) containing lotilaner, moxidectin, praziquantel, and pyrantel against gastrointestinal nematode infections in dogs in the USA](https://pubmed.ncbi.nlm.nih.gov/40713857/). Parasites & vectors, 2025. 3. [Field efficacy of Febantel, Pyrantel embonate and Praziquantel (Drontal® Tasty) against naturally acquired intestinal helminths of hunting dogs in southern Italy](https://pubmed.ncbi.nlm.nih.gov/40993797/). Parasites & vectors, 2025. 4. [Patterns of antiparasitic usage in Golden Retriever breed of dogs: A 9-year cohort study](https://pubmed.ncbi.nlm.nih.gov/42311181/). Journal of helminthology, 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)