Nazione: Stati Uniti
Lingua: inglese
Fonte: NLM (National Library of Medicine)
ZONISAMIDE (UNII: 459384H98V) (ZONISAMIDE - UNII:459384H98V)
DirectRX
ZONISAMIDE
ZONISAMIDE 50 mg
ORAL
PRESCRIPTION DRUG
Zonisamide is indicated as adjunctive therapy in the treatment of partial seizures in adults with epilepsy. Zonisamide is contraindicated in patients who have demonstrated hypersensitivity to sulfonamides or zonisamide. The abuse and dependence potential of zonisamide has not been evaluated in human studies (see WARNINGS, Cognitive/Neuropsychiatric Adverse Events subsection). In a series of animal studies, zonisamide did not demonstrate abuse liability and dependence potential. Monkeys did not self-administer zonisamide in a standard reinforcing paradigm. Rats exposed to zonisamide did not exhibit signs of physical dependence of the CNS-depressant type. Rats did not generalize the effects of diazepam to zonisamide in a standard discrimination paradigm after training, suggesting that zonisamide does not have abuse potential of the benzodiazepine-CNS depressant type.
Abbreviated New Drug Application
ZONISAMIDE- ZONISAMIDE CAPSULE DIRECTRX ---------- ZONISAMIDE DESCRIPTION SECTION Zonisamide is an antiseizure drug chemically classified as a sulfonamide and unrelated to other antiseizure agents. The active ingredient is zonisamide, 1,2-benzisoxazole-3-methanesulfonamide. The molecular formula is C8H8N2O3S with a molecular weight of 212.23. Zonisamide is a white powder, pKa = 10.2, and is moderately soluble in water (0.8 mg/mL) and 0.1 N HCl (0.5 mg/mL). The chemical structure is: spl-zonisamide-structure Zonisamide is supplied for oral administration as capsules containing 25 mg, 50 mg or 100 mg zonisamide, USP. Each capsule contains the labeled amount of zonisamide plus the following inactive ingredients: microcrystalline cellulose, hydrogenated vegetable oil, gelatin, and titanium dioxide. In addition, individual empty hard gelatin capsule shell contains: 50 mg : Black iron oxide. 100 mg : FD&C Blue #1 and FD&C Red #40. The imprinting ink contains black iron oxide, shellac glaze, propylene glycol and also contains either FD & C Blue No. 2, FD & C Red No. 40, FD & C Blue No. 1 and D & C Yellow No.10 or strong ammonia solution and potassium hydroxide. CLINICAL PHARMACOLOGY SECTION Mechanism of Action: The precise mechanism(s) by which zonisamide exerts its antiseizure effect is unknown. Zonisamide demonstrated anticonvulsant activity in several experimental models. In animals, zonisamide was effective against tonic extension seizures induced by maximal electroshock but ineffective against clonic seizures induced by subcutaneous pentylenetetrazol. Zonisamide raised the threshold for generalized seizures in the kindled rat model and reduced the duration of cortical focal seizures induced by electrical stimulation of the visual cortex in cats. Furthermore, zonisamide suppressed both interictal spikes and the secondarily generalized seizures produced by cortical application of tungstic acid gel in rats or by cortical freezing in cats. The relevance of these models to human epilepsy is unknown. Zonisamide may produ Leggi il documento completo