Faculty Collaboration Database

Poly (amidoamine) dendrimer-mediated hybrid formulation for combination therapy of ramipril and hydrochlorothiazide. Eur J Pharm Sci 2017 Jan 01;96:84-92

Date

10/28/2016

Pubmed ID

27614111

DOI

10.1016/j.ejps.2016.09.005

Scopus ID

2-s2.0-84987906214 (requires institutional sign-in at Scopus site)   39 Citations

Abstract

We present a dendrimer-based hybrid formulation strategy to explore the potential of poly (amidoamine) PAMAM dendrimers to be used as drug carriers for combination therapy of an anti-hypertensive drug ramipril (RAPL) and a diuretic hydrochlorothiazide (HCTZ). The drug-dendrimer complexes were prepared by phase-equilibration method. The results showed that the solubility of RAPL and HCTZ was dependent on dendrimer concentration and pH of dendrimer solution. The solubility profile of both RAPL and HCTZ dendrimer complexes illustrated a non-linear relationship with dendrimer concentration. At 0.8% (w/v) dendrimer concentration, solubility of RAPL was increased 4.91 folds with amine-terminated while for HCTZ, solubility enhancement was highest (3.72 folds) with carboxy-terminated. The complexes were characterized by Fourier transform infrared spectroscopy, nuclear magnetic resonance analysis and high performance liquid chromatography. In-vitro drug dissolution performance of pure drugs, individual drug loaded dendrimer formulations and hybrid formulations was studied in USP dissolution medium (pH7.0) and in simulated gastric fluid (pH1.2). Dendrimer mediated formulations showed faster and complete dissolution compared to pure RAPL or HCTZ. Surprisingly, similar pattern of dissolution profile was established with hybrid formulations as compared to individual drug loaded dendrimers. The dendrimer-based hybrid formulations were found to be stable at dark and refrigerated conditions up to 5weeks. Conclusively, the proposed formulation strategy establishes a novel multitasking platform using dendrimer for simultaneous loading and delivery of multiple drugs for pharmaceutical applications.

Author List

Singh MK, Pooja D, Kulhari H, Jain SK, Sistla R, Chauhan AS

Author

Abhay Chauhan PhD Associate Professor in the School of Pharmacy Operations department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Antihypertensive Agents
Dendrimers
Diuretics
Drug Combinations
Drug Compounding
Drug Liberation
Drug Stability
Hydrochlorothiazide
Ramipril
Solubility