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Fosphenytoin

Fosphenytoin (Cerebyx®, Parke-Davis; Prodilantin®, Pfizer Holding France) is a water-soluble phenytoin prodrug used only in hospitals for the treatment of epileptic seizures. more...

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On 18 November 2004, Sicor Pharms received a tentative approval letter from the United States Food and Drug Administration for a generic version of fosphenytoin.

Uses

Approved

Fosphenytoin is approved in the United States for the short term (five days or less) treatment of epilepsy when more widely used means of phenytoin administration are not possible or are ill-advised, such as endotracheal intubation, status epilepticus or some other type of repeated seizures; vomiting, and/or the patient is unalert or not awake or both.

Unapproved/Off-label/Investigational

In April of 2003, Applebaum and colleagues at the Ben Gurion University of the Negev in Beersheva reported that even though anticonvulsants are often very effective in mania, and acute mania requires rapid treatment, fosphenytoin had no antimanic effect even 60 minutes after administration of doses used in status epilepticus.

Fosphenytoin was more successfully used to relieve pain refractory to opiates in a 37-year-old woman with neuroma, according to Dr. Gary J. McCleane of the Rampark Pain Center in Lurgan, Northern Ireland. She was given 1,500 phenytoin equivalent units of fosphenytoin over a 24 hour period, producing pain relief that last three to fourteen weeks after each infusion, allowing her to use less opiates.

Metabolism

One mmol (millimole) of phenytoin is produced for every mmol of fosphenytoin administered; the hydrolysis of fosphenytoin also yields phosphate and formaldehyde, the latter of which is subsequently metabolized to formate, which is in turn metabolized by a folate dependent mechanism.

Side effects

Side effects are similar to phenytoin, except that fosphenytoin causes less hypotension and more paresthesia. Fosphenytoin can cause hyperphosphatemia in end-stage renal failure patients.

Read more at Wikipedia.org


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Teva Announces Tentative Approval of Fosphenytoin Sodium Injection
From Business Wire, 11/21/04

JERUSALEM -- Teva Pharmaceutical Industries Ltd. (Nasdaq:TEVA) announced today that the U.S. Food and Drug Administration has granted tentative approval for the Company's ANDA for Fosphenytoin Sodium Injection USP, 50 mg PE/mL (PE = phenytoin sodium equivalents). Final approval is expected upon patent expiry on August 5, 2007.

Teva's Fosphenytoin Sodium Injection is the AP-rated generic equivalent of Pfizer's anticonvulsant Cerebyx(R) Injection.

The brand product has annual sales of approximately $62 million.

Teva Pharmaceutical Industries Ltd., headquartered in Israel, is among the top 25 pharmaceutical companies and among the largest generic pharmaceutical companies in the world. The company develops, manufactures and markets generic and innovative human pharmaceuticals and active pharmaceutical ingredients. Close to 90% of Teva's sales are in North America and Europe.

Safe Harbor Statement under the U. S. Private Securities Litigation Reform Act of 1995: This release contains forward-looking statements, which express the current beliefs and expectations of management. Such statements are based on management's current beliefs and expectations and involve a number of known and unknown risks and uncertainties that could cause Teva's future results, performance or achievements to differ significantly from the results, performance or achievements expressed or implied by such forward-looking statements. Important factors that could cause or contribute to such differences include Teva's ability to successfully develop and commercialize additional pharmaceutical products, the introduction of competitive generic products, the impact of competition from brand-name companies that sell or license their own generic products (so called "authorized generics") or successfully extend the exclusivity period of their branded products, the effects of competition on Copaxone(R) sales, including potential competition from the expected launch of Antegren(R), Teva's ability to rapidly integrate the operations of acquired businesses, including its acquisition of Sicor Inc., regulatory changes that may prevent Teva from exploiting exclusivity periods, potential liability for sales of generic products prior to completion of appellate litigation, including that relating to Neurontin, the impact of pharmaceutical industry regulation and pending legislation that could affect the pharmaceutical industry, the difficulty of predicting U.S. Food and Drug Administration, European Medicines Association and other regulatory authority approvals, the regulatory environment and changes in the health policies and structure of various countries, Teva's ability to successfully identify, consummate and integrate acquisitions, exposure to product liability claims, dependence on patent and other protections for innovative products, significant operations outside the United States that may be adversely affected by terrorism or major hostilities, fluctuations in currency, exchange and interest rates, operating results and other factors that are discussed in Teva's Annual Report on Form 20-F and its other filings with the U.S. Securities and Exchange Commission. Forward-looking statements speak only as of the date on which they are made and the Company undertakes no obligation to update publicly or revise any forward-looking statement, whether as a result of new information, future developments or otherwise.

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COPYRIGHT 2004 Gale Group

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