Biodegradable compositions for the controlled release of encapsulated substances

   
   

Pharmaceutical compositions that enable the release of a physiologically active substance over a prolonged period of time following administration to a patient are described. The pharmaceutical compositions are provided by encapsulation of a physiologically active substance into a matrix comprising biodegradable polymers and lipids. The rate of release of the physiologically active substance from the pharmaceutical composition is controlled by varying the ratio of the polymer to the lipid. The compositions can be stored in an aqueous suspension or as a solid dosage form. The physiologically active substances include small molecules, peptides, proteins, nucleic acids and vaccines. The biodegradable polymers include homopolymers, or random or block copolymers. The lipids include phospholipids, cholesterol and glycerides.

As composições pharmaceutical que permitem a liberação de um excesso da substância physiologically ativa um o período de tempo prolongado que segue a administração a um paciente são descritas. As composições pharmaceutical são fornecidas pelo encapsulation de uma substância physiologically ativa em uma matriz que compreende polímeros e lipids biodegradable. A taxa da liberação da substância physiologically ativa da composição pharmaceutical é controlada variando a relação do polímero ao lipid. As composições podem ser armazenadas em uma suspensão aqueous ou como um formulário de dosage contínuo. As substâncias physiologically ativas incluem moléculas pequenas, peptides, proteínas, ácidos nucleic e vacinas. Os polímeros biodegradable incluem homopolymers, ou copolymers aleatórios ou do bloco. Os lipids incluem phospholipids, cholesterol e glycerides.

 
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