Zonisamide
Description Indications Dose titration Plasma levels monitoring Cautions Interactions Special populations Behavioural and cognitive effects in patients with epilepsy Psychiatric use References- Product Name
- Zonisamide
- CAS No.
- 68291-97-4
- Chemical Name
- Zonisamide
- Synonyms
- ZON;ci-912;ad-810;pd110843;excegram;exceglan;Excegran;Zonegran;Excemide;Zoniamide
- CBNumber
- CB0252441
- Molecular Formula
- C8H8N2O3S
- Formula Weight
- 212.23
- MOL File
- 68291-97-4.mol
Zonisamide Property
- Melting point:
- 275°C dec.
- Boiling point:
- 223°C (rough estimate)
- Density
- 1.4306 (rough estimate)
- refractive index
- 1.5690 (estimate)
- Flash point:
- 9℃
- storage temp.
- Keep in dark place,Sealed in dry,2-8°C
- solubility
- H2O: >5 mg/mL, soluble
- form
- solid
- pka
- 10.2(at 25℃)
- color
- off-white
- Merck
- 14,10192
- InChIKey
- UBQNRHZMVUUOMG-UHFFFAOYSA-N
- CAS DataBase Reference
- 68291-97-4(CAS DataBase Reference)
Safety
- Hazard Codes
- Xn,T,F
- Risk Statements
- 22-39/23/24/25-23/24/25-11
- Safety Statements
- 7-16-36/37-45
- RIDADR
- UN1230 - class 3 - PG 2 - Methanol, solution
- WGK Germany
- 3
- RTECS
- DE4930000
- HS Code
- 2935904000
- Hazardous Substances Data
- 68291-97-4(Hazardous Substances Data)
- Toxicity
- LD50 in mice, rats (mg/kg): 1892, 2001 orally; 1273, 2569 s.c.; 699, 733 i.p.; 604, 748 i.v. (Masuda, 1980)
N-Bromosuccinimide Price
- Product number
- Z-005
- Product name
- Zonisamide solution
- Purity
- 1.0?mg/mL in methanol, ampule of 1?mL, certified reference material, Cerilliant?
- Packaging
- 1mL
- Price
- $146
- Updated
- 2024/03/01
- Product number
- 5.08508
- Product name
- Zonisamide-CAS68291-97-4-Calbiochem
- Packaging
- 10mg
- Price
- $132
- Updated
- 2024/03/01
- Product number
- 1725003
- Product name
- Zonisamide solution
- Purity
- United States Pharmacopeia (USP) Reference Standard
- Packaging
- 200mg
- Price
- $2070
- Updated
- 2024/03/01
- Product number
- Z0026
- Product name
- Zonisamide
- Purity
- >98.0%(HPLC)(N)
- Packaging
- 200mg
- Price
- $39
- Updated
- 2024/03/01
- Product number
- Z0026
- Product name
- Zonisamide
- Purity
- >98.0%(HPLC)(N)
- Packaging
- 1g
- Price
- $116
- Updated
- 2024/03/01
Zonisamide Chemical Properties,Usage,Production
Description
Zonisamide is a new generation of sulfonamide anticonvulsant that is primarily used as supplemental therapy in treatment of partial seizures in combination with other antiepileptic medications. Besides, it is approved to be applied as an adjunctive therapy in adults suffering from infantile spasm, mixed seizure types of Lennox–Gastaut syndrome, myoclonic, and generalized tonic clonic seizure. Recent studies have proved that zonisamide can acts as a migraine preventative medication and is effective in several cases of neuropathic pain. In an open-label trial, zonisamide shows positive effects on attenuating the symptoms of tardive dyskinesia.
Zonisamide is a second-generation antiepileptic drug (AED) known with the proprietary brand name of Zonegran® (Eisai) in the UK and USA. It is assumed that zonisamide functions on the sodium and calcium channels in the brain cells, in which it controls electric-currents that are responsible for seizure activity. The FDA approved zonisamide in March 2000.
Indications
Epilepsy
Monotherapy of focal seizures with or without secondary generalization and adjunctive therapy of refractory focal seizures with or without secondary generalization.
Recommendations summarized from NICE (2012)
- Seizure types: on referral to tertiary care (absence seizures, focal seizures, myoclonic seizures).
- Epilepsy types: on referral to tertiary care (absence syndromes, juvenile myoclonic epilepsy, idiopathic generalized epilepsy, benign epilepsy with centrotemporal spikes, panayiotopoulos syndrome, late- onset childhood occipital epilepsy).
Dose titration
Epilepsy
Monotherapy
100 mg od for 14 days, then increased by 100 mg every 14 days; usual maintenance 300 mg od (max. 500 mg daily).
Adjunctive therapy
25 mg bd for 7 days, 50 mg bd for 7 days, then increased by 100 mg every 7 days; usual maintenance 300– 500 mg daily, divided into 1 or 2 doses (dose to be increased every 14 days in patients who are not on carbamazepine, phenobarbital, phenytoin, or other potent inducers of cytochrome P450 enzyme CYP3A4).
Plasma levels monitoring
Although plasma levels can be measured, and a therapeutic range has been postulated (10– 40 mg/ L), there is little evidence base for recommending routine measurement of plasma levels in clinical practice.
Cautions
- Patients with metabolic acidosis (consider dose reduction or discontinuation if metabolic acidosis develops).
- Patients with low body weight or poor appetite (monitor weight throughout treatment).
- Patients with risk factors or predisposition to nephrolithiasis.
- Elderly patients.
Interactions
With AEDs
- Exposure to zonisamide is lower in epileptic patients receiving CYP3A4- inducing agents such as phenytoin, carbamazepine, and phenobarbital. These effects are unlikely to be of clinical significance when zonisamide is added to existing therapy; however, changes in zonisamide concentrations may occur if concomitant CYP3A4- inducing antiepileptic or other medicinal products are withdrawn, dose adjusted or introduced, an adjustment of the zonisamide dose may be required.
- Zonisamide should be used with caution in adult patients treated concomitantly with carbonic anhydrase inhibitors such as topiramate and acetazolamide, as there are insufficient data to rule out a possible pharmacodynamic interaction.
- Caution is advised when starting or stopping zonisamide treatment or changing the zonisamide dose in patients who are also receiving P- gp substrates such as digoxin and quinidine.
- If co- administration with rifampicin (a potent CYP3A4 inducer) is necessary, the patient should be closely monitored and the dose of zonisamide and other CYP3A4 substrates adjusted as needed.
There are no known specific interactions between alcohol and zonisamide and there are no specific foods that must be excluded from diet when taking zonisamide.
Special populations
Hepatic impairment
- Initially increase dose every 14 days in moderate impairment.
- Avoid in severe impairment.
Renal impairment
- Initially increase dose every 14 days in moderate impairment. • Discontinue if renal function deteriorates.
Pregnancy
- There are limited data from the use of zonegran in pregnant women and the potential risk in terms of reproductive toxicity for humans is unknown.
- Zonisamide must not be used during pregnancy unless it is required based on the clinical condition of the patient. In such cases, the dose of zonisamide should be monitored carefully during pregnancy and after birth, and adjustments made on a clinical basis.
- Zonisamide is excreted in human milk; the concentration in breastmilk is similar to maternal plasma. A decision must be made whether to discontinue breastfeeding or to discontinue/ abstain from zonisamide therapy.
Due to the long retention time of zonisamide in the body, breastfeeding must not be resumed until 1 month after zonisamide therapy is completed.
Behavioural and cognitive effects in patients with epilepsy
The behavioural profile of zonisamide in patients with epilepsy features specific problems, which can occur with high doses. The most commonly reported behavioural symptoms are depression, irritability, agitation, and psychosis. Cognitive deficits reported by patients treated with zonisamide mainly involve attention, concentration, and language domains (most effects occur at high doses).
Psychiatric use
Zonisamide does not have any approved indications in psychiatry. Initial findings from uncontrolled studies suggesting that zonisamide may be effective in the treatment of bipolar disorder did not find confirmation. There is preliminary evidence for possible usefulness of zonisamide in the treatment of obesity and psychotropicassociated weight gain, as well as alcohol dependence and withdrawal.
References
https://en.wikipedia.org/wiki/Zonisamide
http://www.medicinenet.com/zonisamide-oral/article.htm
https://pubchem.ncbi.nlm.nih.gov/compound/5734#section=Top
Description
Zonisamide is a broad-spectrum antiepileptic effective in the treatment of refractory seizures. In cultured spinal cord neurons, zonisamide blocks the sustained firing of action potentials induced by depolarizing steps of current injected across the membrane.
Chemical Properties
Off-White Powder
Originator
Dainippon (Japan)
Uses
anticonvulsant;carbonic anhydrase inhibitor, repetitive firing of voltage-gated sodium channels and reduction of T-type calcium channel currents blocker
Uses
Sulfonamide antiseizure agent; blocks repetitive firing of voltagesensitive sodium channels and reduces voltage-sensitive T-type calcium currents. Heterocyclic methanesulfonide with anticonvulsant pro perties. The compound is under investigation for potential therapeutic use as an antiepileptic drug. Anticonvulsant.
Uses
muscarinic antagonist used as an antispasmodic
Uses
For use as adjunctive treatment of partial seizures in adults with epilepsy.
Definition
ChEBI: A 1,2-benzoxazole compound having a sulfamoylmethyl substituent at the 3-position.
Manufacturing Process
To a solution of 8.0 of 3-bromomethyl-1,2-benzisoxazole (m.p. 64-66°) in 130
ml of methanol was added a solution of 8.1 g of sodium sulfite in 130 ml of
water. The mixture was heated with stirring at 50°C for 4 hours and
concentrated under reduced pressure. The crystalline residue was dissolved in
250 ml of methanol with warming and the insoluble material was filtered off.
The filtrate was concentrated under reduced pressure and the crystalline
residue of 1,2-benzisoxazole-3-methanesulfonyl chloride was washed with
diethyl ether to give crude sodium 1,2-benzisoxazole-3-methanesulfonate
(10.5 g).
To 100 ml of phosphorus oxychloride was added 10.5 g of the above-
mentioned sodium salt and the mixture was heated under reflux for 3 hours.
The excess of phosphorus oxychloride was distilled off under reduced
pressure. The residue was dissolved in 200 ml of ethyl acetate and the
removal of the insoluble material by filtration gave the solution of the 1,2-
benzisoxazole-3-methanesulfonyl chloride.
The solution of 1,2-benzisoxazole-3-methanesulfonyl chloride in ethyl acetate,
was cooled on an ice bath, saturated with dry ammonia gas, and allowed to
stand at room temperature for one hour. After the removal of the insoluble
material by filtration, the filtrate was concentrated to yield a crystalline solid,
which was washed with a small amount of ethyl acetate and recrystallized
from ethyl acetate to give the 3-sulfamoylmethyl-1,2-benzisoxazole (5.2 g),
m.p. 160-163°C.
brand name
Zonegran (Dainippon Pharmaceutical Co., Japan);Exegran.
Therapeutic Function
Anticonvulsant; Antiepileptic
Biological Functions
Zonisamide has only recently been approved for use in the United States, although it has been available in Japan for several years. It is effective in partial complex and generalized tonic–clonic seizures and also appears to be beneficial in certain myoclonic seizures. It has a long half-life (about 60 hours) and requires about 2 weeks to achieve steady-state levels. It causes cerebellovestibular side effects similar to those of most other AEDs sharing its mechanism of action. In addition, it appears to cause an increased incidence of kidney stones.
General Description
Zonisamide, a sulfonamide-type anticonvulsant was recentlyapproved for adjunctive therapy in the treatment ofpartial seizures in adults with epilepsy.Zonisamide isprimarily metabolized by reductive ring cleavage of the 1,2-benzisoxazole ring to 2-sulfamoyl-acetyl-phenol. This biotransformation is mainly carried out by theintestinal bacteria rather than the mammalian cytosolicaldehyde oxidase suggested earlier.Again, because ofthe presence of a sulfonamide moiety in zonisamide molecule,precaution should be given to patients who have ahistory of hypersensitivity reactions toward sulfonamidedrugs and concomitant use of zonisamide with other carbonicanhydrase inhibitors should also be avoided.
Mechanism of action
Zonisamide is a sulfonamide derivative that is indicated as an adjunct for partial seizures in patients older than 16 years whose seizures are not controlled by first-line drugs. In Japan, it is used for myoclonic seizures as well. Apparently, it has more than one mechanism of action—all as yet unidentified. It is known to produce blockade of both sodium and T-type calcium channels. Because it also affects dopaminergic transmission, bipolar or schizoaffective disorder patients may improve.
Pharmacokinetics
The absorption for orally administered zonisamide is slow but nearly complete. Its
pharmacokinetics are nonlinear, with a half life of 50 to 70 hours when administered alone or 27 to 46 hours when administered
concurrently with enzyme-inducing AEDs. Protein binding is moderate (<50%). An oral dose of zonisamide is completely
absorbed, with peak plasma concentration occurring in 2 to 6 hours. Although the presence of food will delay the attainment of
its peak plasma concentration, oral bioavailability does not appear to be altered. More than one-third of each oral dose is
excreted in the urine in an unchanged form. The routes of metabolism for zonisamide include acetylation to form its N-acetyl
metabolite, reduction by CYP3A4/CYP2D6, and the formation of an open-ring metabolite, 2-sulfamoylacetyl phenol. These
metabolites subsequently are eliminated unconjugated or glucuronidated in the urine, with an elimination half-life of 63 hours.
Its coadministration with enzyme-inducing AEDs, such as phenytoin, CBZ, or phenobarbital, and with valproate will alter its
pharmacokinetics by reducing its half-life and serum concentration. The half-life for zonisamide is decreased to 27 hours in the
presence of phenytoin, to 38 hours in the presence of either CBZ or phenobarbital, and to 46 hours with valproate. Other drugs
that inhibit or induce CYP3A4 could affect the metabolism of zonisamide.
Zonisamide should be used with caution in patients with hepatic or renal disease. It also has shown to be teratogenic in animal
studies.
Clinical Use
Antiepileptic
Side effects
Zonisamide is contraindicated in patients with a history of allergy to sulfonamides. The most frequent side effects include somnolence, anorexia, dizziness, agitation, confusion, headache, cognitive impairment, and memory loss. In addition, an incidence of drug-induced psychosis has been noted. Reports from both the United States and Europe have indicated that development of renal stones may occur with use of this drug. A family history of nephrolithiasis may be a contraindication, and urinary monitoring for hypercalciuria may be warranted in bedridden patients or those receiving multiple AEDs. Although the incidence of severe rashes attributable to zonisamide is low, sulfonamides are associated with Stevens-Johnson syndrome. Thus, it is recommended to discontinue the drug immediately should a rash occur.
Safety Profile
Moderately toxic by ingestion,intraperitoneal, subcutaneous, and intravenous routes. Anexperimental teratogen. Other experimental reproductiveeffects. When heated to decomposition it emits very toxicfumes of SOx and NOx. An anticonvulsant.
Veterinary Drugs and Treatments
Zonisamide may be useful as an “add-on” drug for refractory epilepsy in dogs.
Drug interactions
Potentially hazardous interactions with other drugs
Antidepressants: anticonvulsant effect antagonised;
avoid with St John’s wort.
Antimalarials: anticonvulsant effect antagonised by
mefloquine.
Antipsychotics: anticonvulsant effect antagonised.
Orlistat: increased risk of convulsions.
Metabolism
Zonisamide is metabolised mainly by reductive cleavage
of the benzisoxazole ring of the parent drug by CYP3A4
to form 2-sulphamoylacetylphenol (SMAP) and also
by N-acetylation. Parent drug and SMAP can also be
glucuronidated.
The metabolites, which could not be detected in
plasma, are inactive. Excretion is mainly in the urine;
about 15 to 30
% appearing as unchanged drug, 15
%
as N-acetylzonisamide, and 50
% as the glucuronide of
SMAP.
storage
Store at +4°C
Zonisamide Preparation Products And Raw materials
Raw materials
Preparation Products
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View Lastest Price from Zonisamide manufacturers
- Product
- Zonisamide 68291-97-4
- Price
- US $0.00/kg
- Min. Order
- 0.1kg
- Purity
- 98%
- Supply Ability
- 10kg
- Release date
- 2023-12-08
- Product
- Zonisamide 68291-97-4
- Price
- US $15.00-10.00/KG
- Min. Order
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- Purity
- 99%+ HPLC
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- Release date
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- Product
- Zonisamide 68291-97-4
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- Min. Order
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- Purity
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- Monthly supply of 1 ton
- Release date
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