Pharmaceutical formulation composed of a polymer blend and an active compound for time-controlled release
A formulation containing a biologically active compound having a structure with hydrogen bonding sites blended with a first polymer having a structure with complementary hydrogen bonding sites and a second polymer that degrades to form degradation products that promote the release of the active compound from the first polymer.
1. A formulation comprising a biologically active compound having a chemical structure with hydrogen bonding sites, a first biocompatible, hydrolytically degrading polyarylate with hydrogen bonding sites comprising tyrosine-derived diphenol monomer units, and a second biocompatible polymer that is less hydrophobic than said polyarylate, so that said second polymer degrades hydrolytically to form acidic degradation products that promote the release of said active compound, and wherein said second polymer is selected from the group consisting of a second polyarylate comprising tyrosine-derived diphenol monomer units, a poly(glycolic acid), a poly(lactic acid), a poly(glvcolic acid-co-lactic acid) (PGLA), a polycaprolactone and a poly(hydroxyalkanoic acid).
2. The formulation of claim 1 , wherein said biologically active compound is pharmaceutically active.
3. The formulation of claim 2 , wherein said pharmaceutically active compound is a peptide.
4. The formulation of claim 3 , wherein said peptide is a platelet aggregation inhibiting (PAI) peptide.
5. The formulation of claim 4 , wherein said PAI peptide is a synthetic cyclic heptapeptide antagonist of glycoprotein IIb/IIa.
6. The formulation of claim 1 , wherein said polyarylate is randomly block copolymerized with a poly(alkylene oxide).
7. The formulation of claim 1 , wherein said polyarylate is poly(DTH adipate).
8. The formulation of claim 1 , wherein said second polymer is PGLA.
9. The formulation of claim 7 , wherein said second polymer is PGLA and said active compound is a pharmaceutically active peptide.
10. A method for the pulsatile delivery of an active compound to a patient in need thereof comprising administering to said patient the formulation of claim 1 .