Correlação in vitro in vivo para formas farmacêuticas sólidas de liberação modificada contendo diclofenaco de sódio / In vitro-in vivo correlation for sodium diclofenac modified release tablet formulations

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The term in vitro-in vivo correlation (IVIVC) refers to the establishment of a rational relationship between the biological properties, or a parameter derived from a biological property produced by a dosage form, and a physicochemical characteristic or property of the same dosage form. The establishment of IVIVC enables the substitution of in vivo studies for in vitro studies to evaluate bioequivalence, e.g. in case of post-approval changes. Matrix tablets employ mainly hydrophilic polymers to control drug release. Hydroxypropylmethylcellulose (HPMC) is an excipient of choice for preparation of hydrophilic matrices, due to its gel formation and controlled drug release capacities. Sodium diclofenac (SD) is a non-steroidal anti-inflammatory drug with analgesic and antipyretic effects. Considering its physicochemical and pharmacological characteristics, the objective of this work is to establish an IVIVC for HPMC matrix tablets containing SD. HPMC matrix tablets with SD were formulated and submitted to dissolution testing using apparatus 1, 2, 3 and 4 in accordance with pharmacopoeial specifications. The bioavailability study was carried out under ethical guidelines, using the selected formulations. The correlation was obtained by plotting absorption data, obtained from diclofenac plasmatic curves through a deconvolution technique, against dissolution data. The results showed that the increase of HPMC concentration produces a decrease of the drug dissolution rate and these differences were more or less significant, depending on the study conditions. Tablets with intermediate HPMC concentrations (15 to 20%) were more sensitive to changes in dissolution conditions. Formulations containing 30% HPMC do not present changes in dissolution profiles, even when the formulation or the study conditions change. Formulations F1, F2A, F3 and Voltaren® 50 mg as reference product were used in the bioavailability study to establish IVIVC. The linear correlation between absorbed drug fraction and dissolved drug fraction has a determination coefficient higher than 0.7. It was observed that the dissolution profiles are more discriminative than the absorption profiles, which indicates that a better correlation can be obtained through changes of the dissolution method.

ASSUNTO(S)

dosage forms in vitro-in vivo correlation formas farmacêuticas dissolução correlação in vitro-in vivo bioavailability matrix tablet comprimidos matriciais dissolution sodium diclofenac estudo de biodisponibilidade diclofenaco de sódio

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