With limited available evidence supporting its efficacy in the veterinary field, this medication has been widely used for anti-seizure purpose in dogs and in humans (27). If you miss giving your pet a dose, give the next dose as soon as you remember, but if it is closer than 12 hours before the next scheduled dose, either: Never give your pet two doses at once or give extra doses. This is the place for general questions about drugs, long-term treatment concerns, possible influences of other drugs (such as antibiotics, heartworm preventatives, or anesthetics) for epileptic dogs, and other concerns. Zonisamide (brand name: Zonegran) is an anticonvulsant (antiseizure) medication that is either used as an initial therapy for epilepsy or as an add-on drug for difficult to control seizures. Get the personalized nutrition plan your dog needs with non-GMO air dried dog food. (2008) 31:54453. If seizure control is unsatisfactory, the drug level should be checked. Treatment in canine epilepsy - a systematic review. If seizures do recur, it is likely that they will be controlled again with medication. To do this, it may be the right choice to change or lower the number of medications you are taking. (2000) 9:6570. There is no clinical information on use of felbamate in cats. CNS Drugs. Valproic acid (1060 mg/kg, tid) has been used as an adjunct to phenobarbital and primidone in dogs with refractory seizures. Cook AK, Allen AK, Espinosa D, Barr J. Renal tubular acidosis associated with zonisamide therapy in a dog. Merck & Co., Inc., Rahway, NJ, USA(known as MSD outside of the US and Canada) is dedicated to using the power of leading-edge science to save and improve lives around the world. (2007) 68:4550. She was initially put on Zonisamide but after 2 weeks, she had a couple more seizures. The abrupt episode typically lasted for ~2030 s. 1. To discontinue any AED, except bromide, the dose of the drug should be tapered gradually over a few weeks to avoid precipitating a seizure. (2000) 22:2303. In all species, it takes ~2 wk to approach a steady-state plasma concentration, because oral absorption is extremely variable and the half-life is long. Apparent acute idiosyncratic hepatic necrosis associated with zonisamide administration in a dog. Seizures are involuntary and may cause changes in movement, behavior, or consciousness. (2004) 13:S5965. After 12 weeks of treatment, 7 out of 10 dogs were seizure-free. (2013) 260:71440. BMC Vet Res. Chung J, Hwang C, Chae J, Ahn J, Kim T, Seo K, et al. In most cases, the risk of stopping medication slowly is low. The phenobarbital metabolite is likely the major functional one, and there may not be an advantage to using primidone over phenobarbital. doi: 10.1016/j.yebeh.2006.08.008, 40. by SpencerBhumi Thu Aug 14, 2014 3:08 pm, Return to Treatment & Maintenance Issues for Epileptic Dogs. Psychiatric adverse effect associated with anti-seizure drugs has been well-recognized in human medicine. An 11-year-old male castrated golden retriever that weighed 29.1 kg was evaluated at Saitama Animal Medical Center for recently increasing frequency of the generalized tonicclonic seizures (GTCS). Zonisamide is used off-label for therapy of migraine headaches, mood disturbances and recently for weight loss. by ShilohsMom Mon Aug 11, 2014 9:25 am, Post Zonisamide (Oral Route) Side Effects Drug information provided by: Merative, Micromedex Along with its needed effects, a medicine may cause some unwanted effects. 23 Articles, This article is part of the Research Topic, https://doi.org/10.3389/fvets.2021.763822, https://www.frontiersin.org/articles/10.3389/fvets.2021.763822/full#supplementary-material, Creative Commons Attribution License (CC BY). Zonisamide was approved for use in epilepsy in Japan in 1989 and in the United States in 2000. doi: 10.1016/j.eplepsyres.2005.11.004, PubMed Abstract | CrossRef Full Text | Google Scholar, 2. Although plasma concentrations declined rapidly in dogs on a 1-wk regimen of 30 mg/kg, tid, one case report described adequate seizure control despite undetectable drug concentrations in plasma, possibly due either to an active metabolite or to a highly sensitive drug reaction. Her prognosis is guarded. Severe withdrawal symptoms, even lethal seizures, may appear after abrupt discontinuation of chronic clorazepate treatment, in spite of the relatively low tolerance liability of clorazepate. This dog bit the client on the arm multiple times. For longterm maintenance in cats and dogs, phenobarbital may be given at 24 mg/kg/day, PO, bid. The exact same episodes relapsed within days after re-administration of zonisamide and disappeared again shortly after discontinuation of zonisamide. I lost a LOT of weight and the more bothersome side effects--memory loss, difficulty . by seebr5640 Sun Jun 30, 2013 1:08 pm, Post She's been on it so briefly, but who knows, the KBR may have caused it. (2017) 251:145761. She's on a low-fat diet for a few weeks to help her pancreas return to normal. The regular maintenance dose can be started at the same time as the loading dose or immediately afterward. In humans, dose-related adverse effects of ZNS include somnolence, dizziness, decreased appetite or anorexia, and nausea (5, 19, 20). This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). Some of the side effects of Zonisimide include dizziness, headache, nausea, vomiting and trouble sleeping. An IV formulation can be used in status epilepticus. A 10-year-old male castrated miniature poodle was referred to Veterinary Specialists and Emergency Center for recent onset of generalized seizure episodes, decreased appetite, and abnormal behavior. o [ canine influenza] Hopefully we are out of the woods with the pancreatitis. Following administration of zonisamide (10 mg/kg/day, 30 mg/kg/day or 60 mg/kg/day) to pregnant dogs during organogenesis, increased . For maintenance therapy in dogs, it may be used alone at 0.5 mg/kg, tid, but it is best used as an adjunct to phenobarbital at dosages of 0.10.5 mg/kg/day. Seven days later, the owner reported episodic aggression was improved by 40% compared with that prior to dose reduction. The elimination half-life is extremely long (24 days) in dogs; therefore, it takes ~4 mo to achieve steady state kinetics. J Vet Pharmacol Ther. Zonisamide may cause hyperammonemia (too much ammonia in the blood), which may damage the brain and can be life-threatening. The severity and frequency of the episodic aggression showed proportional relationship with the dose of ZNS. Clorazepate dipotassium (0.51 g/kg, tid) has been proposed as an adjunct to phenobarbital treatment in dogs. Dose adjustments of other anti-seizure medications in case 2 did not result in significant changes in these behavior episodes. Hepatotoxicity and liver failure in dogs have been associated with high serum concentrations (>35 mcg/mL), necessitating the serum level checks every 612 mo. Basset/Beagle mix was officially pegged with epilepsy about 2 months ago after she started having multiple seizures in a day. Tapering off Gabapentin though requires patience so you need to be careful to not immediately take your dog off large doses of it. This will begin to lessen the puppies' dependence on their mother's milk and presence. Seven days after the dose increment of LEV, ZNS was re-introduced at 6.6 mg/kg PO q12h to confirm the direct association of abnormal behavior and ZNS. Schwartz M, Muana KR, Olby NJ. Do not stop this medication suddenly or else seizures may occur. Figure 1. Clonazepam, unlike diazepam, can be used in dogs for oral maintenance therapy, because anticonvulsant tolerance develops less rapidly, the saturability of its metabolism reduces the elimination rate at therapeutic concentrations, and because it is more highly absorbed orally (particularly in micronized formulations). In this study, CAE was described as cognitive slowing, memory deficits, and language dysfunction, and PAE was described as depression, aggressive behavior, psychosis, irritability, or suicidal ideation (24). Because it does not undergo hepatic metabolism, bromide is useful in dogs with liver disease. Stopping suddenly may result in withdrawal symptoms, including life-threatening seizures. It has been used as an adjunct AED for dogs and cats and is occasionally used as monotherapy. Adverse effects classified as type 4 have not been reported (7). An oral loading dosage of 400600 mg/kg of bromide is divided into four doses and given with food over a 1- to 4-day period. Levetiracetam is initially administered at 20 mg/kg, PO, tid, in dogs; 1020 mg/kg, PO, tid, in cats. Miyamoto T, Kohsaka M, Koyama T. Psychotic episodes during zonisamide treatment. o [alopecia OR hair loss ], , DVM, DACVIM-Neurology, Ross University School of Veterinary Medicine. i will go on this drug once i come off topamax I've been on topamax forever! BMC Vet Res. If a medication needs to be stopped abruptly, it is normally done in a hospital where close supervision is available. Many epilepsies that begin in childhood may be outgrown. Taper off 2 weeks prior to surgery if possible OK to continue Discontinue at least 10 days prior to surgery if possible Drug interactions (e.g., ephedrine, meperidine, methadone, tramadol), which could cause a hypertensive crisis. 2 In addition to the treatment of several generalized epilepsy syndromes, it may also play a role in managing obesity, migraine, and motor dysfunction in Parkinson disease (PD). by MK's mom Sat Aug 09, 2014 7:24 pm, Post Similarly, a case series study described abnormal behavior episodes in dogs receiving LEV (40). Spencers last two clusters have changed. Because a daily maintenance dose may take 4 mo to reach steady state serum concentration, there are situations (eg, severe seizures, seizures that occur on a monthly basis, the need to rapidly switch from phenobarbital to bromide because of phenobarbital toxicity) when a loading dose of bromide should be administered. Felbamate is a dicarbamate AED that exerts its anticonvulsant effects through multiple mechanisms, including potentiating GABA-mediated neuronal inhibition, inhibiting voltage-sensitive neuronal calcium and sodium channels, and blocking N-methyl-d-aspartatemediated neuronal excitation. The frequency of his GTCS decreased after increment of ZNS up to 13.7 mg/kg q12h while the abnormal behavior episodes increased in its frequency further to over 10 times a day, including abrupt growling at or attempts to bite the family members when they came into his sight while awake (Supplementary Video 1). Here, we report three dogs with abnormal behavior episodes associated with ZNS. A 50:50 mixture of milk replacer and water is recommended. doi: 10.1111/j.1939-1676.2011.00801.x, 18. These include the drugs clonazepam, clobazam, diazepam, lorazepam, and clorazepate. (2007) 30:23040. When bromide is used as the sole treatment for epilepsy in dogs, higher dosages (5080 mg/kg/day) may be necessary. I am pleased to hear that you have gotten through this - both recovering from pancreatitis and successfully switching the medications. doi: 10.5326/0400285, 31. It is well absorbed in dogs after oral administration and undergoes both hepatic and renal metabolism. According to the owner, this dog suddenly stood up during the sleep to bite his tail or blanket for a minute. (2007) 10:10510. Baulac M. Introduction to zonisamide. The owner reported that significant improvements were recognized within 24 h after the dose reduction and no seizure episodes were witnessed. (2005) 46:3141. (2016) 12:79. doi: 10.1186/s12917-016-0703-y, 3. Zonisamide (ZNS) is a benzisoxazole derivative with a non-arylamine sulfonamide group (1) and is chemically unrelated to other anti-seizure drugs (ASDs) used in veterinary medicine. A 6-year-old female spayed miniature poodle weighing 5.05 kg was referred to Veterinary Specialists and Emergency Center for episodic aggression. It appears very safe with no to few adverse effects (ataxia, sedation, vomiting) reported at the routine dosage ranges. J Am Vet Med Assoc. The severity of the episodic aggression was scaled as 100% at the initial appointment and the sequential change in the severity was evaluated by the client and provided at each follow-up appointment in the gross scale of 0100%. University of Veterinary Medicine Hannover, Germany, University of Veterinary Medicine Vienna, Austria, Cave Veterinary Specialists, United Kingdom. Although some of it is metabolized by the P450 enzyme system, much is excreted unchanged in the urine. Kubota M, Nishi-Nagase M, Sakakihara Y, Noma S, Nakamoto M, Kawaguchi H, et al. Severe bromide toxicosis (bromism) is characterized by lethargy, disorientation, delirium, and ataxia progressing to quadriplegia and coma. Prior to the referral, this dog had been managed with ZNS starting at 2.5 mg/kg per os (PO) q12h then gradually increased in the dose up to 5 mg/kg q12h with the trough blood concentration at 21.2 g/ml over the 15 months. This sulfonamide-based anticonvulsant restricts the propagation and spread of seizures and suppresses epileptogenic focus activity. Therapeutic monitoring is not usually necessary with this drug. Post Zonisamide was first used in Japan in 1972 to treat psychiatric diseases, and it has been widely used to treat epilepsy in Japan and Korea since at least 1990. Zonisamide was prescribed with the gradual dose increment plan potentially up to 13.7 mg/kg q12h if needed based on his seizure frequency. Treatment & Maintenance Issues for Epileptic Dogs, Awareness & Support by Clubs & Other Groups. Other reported adverse effects include fatigue, headache, psychiatric symptoms, cognitive disturbances, diplopia, weight loss, diarrhea, ataxia, oligohydrosis, urolithiasis, and rash (1924). (2018) 200:10613. Although not all of these side effects may occur, if they do occur they may need medical attention. Colleen, Rylie, Sophie & angels Izzie & Shiloh. Recently, ZNS-related anticonvulsant hypersensitivity syndrome was reported in cats (27). If the puppies do not take to the gruel, try blending this ratio: 2 cups of puppy food. Reports of hindlimb weakness should be investigated as potential bromide toxicosis by measuring serum bromide concentration and discontinuing bromide for several days to see whether the weakness improves. This synthetic analogue of the inhibitory neurotransmitter -amino butyric acid (GABA) inhibits seizure activity via multiple mechanisms, including inhibition of neuronal sodium channels and potentiation of the release and action of GABA. Drug levels are monitored 2 wk after initiation of therapy, 2 wk after any dosage change, and usually every 612 mo once seizure control is achieved. In foals, phenytoin has erratic plasma concentrations. How Public Health Programs Support the Epilepsy Community, 3540 Crain Highway, Suite 675,Bowie, MD 20716, 2023 Epilepsy Foundation, is a non-profit organization with a 501(c)(3) tax-exempt status. The weaning process should happen gradually, over a few weeks. (2014) 10:257. doi: 10.1186/s12917-014-0257-9, 33. doi: 10.1111/ane.12016, 20. The authors thank the owners of three cases, referring veterinarians and colleagues at Veterinary Specialists & Emergency Center for supporting us for the article preparation. Chronological changes in episodic aggression in association with dose adjustments of ZNS are summarized in Figure 1. Last weekend, she had a partial seizure followed by a grand mal seizure, followed by another partial within about a 3-hour time frame. But, taking them daily may cause drowsiness, dizziness and loss of balance, and other side effects. Child Care/Camps/Rec. Copyright 2023 Merck & Co., Inc., Rahway, NJ, USA and its affiliates. Zaccara G, Specchio LM. Taking multiple medications can reduce quality of life because of side effects, drug interactions, and cost. Epilepsy is one of the most common neurological disorders in dogs (), characterized by spontaneous recurrent seizures originating in the central nervous system ().The prevalence of canine epilepsy varies in different studies between 0.5% and 5% ().If no underlying cause except of hereditary factors are found for the recurrent seizures in the diagnostic work-up, epilepsy is . Certain medications called benzodiazepines have anti-seizure effects. Treatment of essential tremor: a systematic review of evidence and recommendations from the Italian movement disorders association. Bhatti SFM, de Risio L, Muana K, Penderis J, Stein VM, Tipold A, et al. Epilepsia. Copyright 2021 Kanazono, Ukai and Hiramoto. Ideally, you need to remove small traces of it each day until eventually your dog is completely free from it. BMC Vet Res. It is typically used twice daily in dogs, usually as a supplement to phenobarbital. Another category of CNS-related adverse effect, CAE in humans, has also been demonstrated in the forms of decreased trainability or decreased activity level in dogs (41, 42). Interestingly, 51.2% of LEV-attributed PAE symptoms in humans resolved with dose decrement, whereas only 15.4% patients of ZNS-attributed PAE symptoms resolved with dose decrement and the rest (85.6%) of ZNS-attributed PAE symptoms required complete cessation of ZNS (38). Packer RMA, McGreevy PD, Pergande A, Volk HA. I don't think I've ever felt more helpless. Episodes showed no response to acepromazine (unknown dose or route). Daily seizure episodes resolved after ZNS was added. 3 Zonisamide can be used in either cats or dogs for control of seizures. This dog was managed well with PB (2 mg/kg q12h) and LEV (20 mg/kg q8h) with no observable epileptic or aggressive behavior episodes for 13 months until this dog died of an unrelated condition. ApplAnim Behav Sci. Bromide has been used in horses as a maintenance AED, but there are no published studies on its clinical efficacy. The authors also thank Dr. Zonisamide was further increased to 7.5 mg/kg q12h due to a few events of cluster of seizures. : 10.1111/ane.12016, 20 is no clinical information on use of felbamate weaning dog off zonisamide voltaren cats significant changes these. Other Groups in human Medicine Hopefully we are out of the episodic aggression in association with dose adjustments of anti-seizure... They will be controlled again with medication hepatic and Renal metabolism life because of side effects of Zonisimide include,... To bite his tail or weaning dog off zonisamide voltaren for a minute used twice daily in dogs, usually as maintenance... 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Administered at 20 mg/kg, PO, bid with medication were witnessed 7 ) Austria, Veterinary..., but there are no published studies on its clinical efficacy Allen AK, Espinosa D, Barr J. tubular... Divided into four doses and given with food over a 1- to period! Used as an adjunct AED for dogs and cats and dogs, phenobarbital may be.! Go on this drug once i come off topamax i & # x27 ; dependence on mother! Topamax forever ratio: 2 cups of puppy food ( 2016 ) doi. If they do occur they may need medical attention it may be necessary 10:257. doi: 10.1186/s12917-014-0257-9 33..
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