The present invention relates to novel pharmaceutical formulations for the release of an active principle (AP) over a sustained period of time of several days, or even several weeks.
The invention relates, in a first aspect, to a liquid formulation comprising at least one active principle (AP) and an aqueous suspension based on colloïdal particles of a polymer (PO), wherein said formulation satisfies the following four conditions:
(a) the polymer (PO) is a polyamino acid comprising glutamic residues, wherein
some glutamic residues each carry a pendant cationic group (CG), said cationic groups being identical or different from one another, and
other glutamic residues each carry a pendent hydrophobic group (GH), said hydrophobic groups (GH) being identical or different from one another,
(b) the pHf value of the pH of said formulation is between 3.0 and 6.5;
(c) at the pHf value, the polymer (PO) forms a colloïdal solution which associates spontaneously and noncovalently with the active principle (AP);
(d) 1 ml of said formulation precipitates during mixing with a volume of 1 ml of a test buffer solution Tp.
The invention also relates to a process for the preparation of such formulations and to a process for the preparation of medicaments including such formulations.
本发明涉及用于在数天甚至数周内持续释放活性成分(AP)的新型药物配方。该发明涉及第一方面的液体配方,包括至少一种活性成分(AP)和基于聚合物(PO)的胶体颗粒的
水悬浮液,其中该配方满足以下四个条件:
(a) 聚合物(PO)是一种包含谷
氨酸残基的多
氨基酸,其中
一些谷
氨酸残基各自携带一个阳离子基团(CG),这些阳离子基团相互相同或不同,以及
其他谷
氨酸残基各自携带一个亲
水性基团(GH),这些亲
水性基团(GH)相互相同或不同,
(b) 该配方的pHf值在3.0和6.5之间;
(c) 在pHf值下,聚合物(PO)形成与活性成分(AP)自发且非共价地结合的胶体溶液;
(d) 1毫升该配方在与1毫升测试缓冲溶液Tp混合时沉淀。
该发明还涉及制备此类配方的方法以及包括此类配方的药物的制备方法。