Preparation of injectable suspensions having improved...

A - Human Necessities – 61 – K

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A61K 9/10 (2006.01) A61K 31/519 (2006.01) A61K 47/34 (2006.01) A61K 47/38 (2006.01)

Patent

CA 2406536

Injectable compositions having improved injectability. The injectable compositions include microparticles in an aqueous injection vehicle having a viscosity of at least 20 cp at 20°C. The increased viscosity of the injection vehicle that constitutes the fluid phase of the suspension significantly reduces in vivo injectability failures. The injectable compositions can be made by mixing dry microparticles with an aqueous injection vehicle to form a suspension, and then mixing the suspension with a viscosity enhancing agent to increase the viscosity of the fluid phase of the suspension to the desired level for improved injectability.

La présente invention concerne des compositions injectables à injectabilité améliorée. Ces compositions injectables comprennent des microparticules dans un véhicule d'injection aqueux possédant une viscosité d'au moins 20 cp à 20<0> C. La viscosité augmentée de ce véhicule d'injection qui constitue la phase liquide de la suspension réduit considérablement les erreurs d'injectabilité in vivo. Ces compositions injectables peuvent être réalisées par le mélange de microparticules sèches avec un véhicule d'injection aqueux de façon à former une suspension, puis par le mélange de cette suspension avec un agent facilitant la viscosité de façon à augmenter la viscosité de la phase liquide de cette suspension à un niveau recherché en vue d'une meilleure injectabilité.

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