Oral dosage form of a sulfonamide prodrug

A - Human Necessities – 61 – K

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Details

A61K 31/42 (2006.01) A61P 29/00 (2006.01)

Patent

CA 2466504

A pharmaceutical composition that is substantially free of water comprises at least one orally deliverable dosage unit comprising a therapeutically effective amount of a sulfonamide prodrug and, where the prodrug is readily degradable ex vivo, has means to inhibit such degradation prior to oral administration. Illustratively the prodrug is parecoxib or a water-soluble salt thereof, and the composition has means to inhibit conversion of the parecoxib to valdecoxib. A method of treating or preventing a COX-2 mediated disorder in a subject comprises (a) dissolving at least one dosage unit of such a composition in a pharmaceutically acceptable aqueous vehicle to form a solution, and (b) orally administering the solution to the subject before substantial precipitation of insoluble matter occurs in the solution.

Cette invention se rapporte à une composition pharmaceutique pratiquement exempte d'eau, qui comprend au moins une unité posologique administrable par voie orale contenant une quantité thérapeutiquement efficace d'un promédicament au sulfonamide et, lorsque celui-ci est immédiatement dégradable ex vivo, un moyen destiné à empêcher cette dégradation avant l'administration par voie orale. A titre illustratif, ce promédicament est le parecoxib ou un sel hydrosoluble de celui-ci, et ladite composition contient un moyen destiné à empêcher la conversion du parecoxib en valdecoxib. Cette invention concerne également un procédé servant à traiter ou à prévenir une infection à médiation par COX-2 chez un sujet et consistant: (a) à dissoudre au moins une unité posologique de cette composition dans un excipient aqueux pharmaceutiquement acceptable, pour former une solution, et (b) à administrer par voie orale cette solution audit sujet, avant qu'une précipitation substantielle de la matière insoluble ne se produise dans la solution.

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