title: Once-daily tablet formulation and in vitro release evaluation of cefpodoxime using hydroxypropyl methylcellulose: A technical note.
abstract: Decreasing the dose frequency of cefpodoxime proxetil increases patient compliance; patients prefer to take the drug once daily. It also improves the rate of bacterial killing and hastens the cure from the indications, and therefore increases compliance. The hydrophilic matrix of HPMC controlled the cefpodoxime proxetil release effectively for 24 hours; hence, the formulation can be considered as a once-daily sustained-release tablet of cefpodoxime proxetil. The formulation showed acceptable pharmacotechnical properties and assay requirements. In vitro dissolution studies indicated a sustained-release pattern throughout 24 hours of the study that was comparable to the theoretical release profile. Drug release kinetics indicated that drug release was best explained by Higuchi's equation, as these plots showed the highest linearity (r2=0.9734), but a close relationship was also noted with zero-order kinetics (r2=0.9708). Korsmeyer's plots indicated ann value of 0.57, which was indicative of an anomalous diffusion mechanism or diffusion coupled with erosion; hence, the drug release was controlled by more than one process. Hixson-Crowell plots indicated a change in surface area and diameter of the tablets with the progressive dissolution of the matrix as a function of time.
authors.affiliation: Faculty of Pharmacy, University Road, 75270, Karachi, Pakistan.
authors.forename: Hamid A
authors.initials: HA
authors.lastname: Merchant
authors.affiliation: Faculty of Pharmacy, University Road, 75270, Karachi, Pakistan. harrisshoaib2000@yahoo.com.
authors.forename: Harris M
authors.initials: HM
authors.lastname: Shoaib
authors.affiliation: Faculty of Pharmacy, University Road, 75270, Karachi, Pakistan.
authors.forename: Jaweria
authors.initials: J
authors.lastname: Tazeen
authors.affiliation: Faculty of Pharmacy, University Road, 75270, Karachi, Pakistan.
authors.forename: Rabia I
authors.initials: RI
authors.lastname: Yousuf
keywords: Cefpo SR; Cefpodoxime proxetil; hydrophilic matrix tablets; hydroxypropyl methylcellulose (HPMC); in vitro sustained drug release; once-daily tablet