Gastric-resistant isoniazid pellets reduced degradation of rifampicin in acidic medium
| Autor: | Fátima Duarte Freire, Manuela Bernardo Câmara, Monique Gomes Dantas, Cícero Flávio Soares Aragão, Túlio Flávio Accioly de Lima e Moura, Fernanda Nervo Raffin |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Brazilian Journal of Pharmaceutical Sciences, Vol 50, Iss 4, Pp 749-755 (2014) |
| Druh dokumentu: | article |
| ISSN: | 2175-9790 1984-8250 |
| DOI: | 10.1590/S1984-82502014000400010 |
| Popis: | Isoniazid and rifampicin are considered the first-line medication for preventing and treating tuberculosis. Rifampicin is degraded in the stomach acidic environment, especially when combined with isoniazid, factor contributing to treatment failure. In this study, gastric-resistant isoniazid pellets were obtained to physical contact of this drug with rifampicin and to bypass the stomach´s acidic environment. The pellets were fabricated using the extrusion-spheronization technique. The coating process was conducted in a fluid spray coater using Acrycoat L 100(r) solution as the coating agent. The pellets obtained were submitted to a dissolution test in HCl 0.1 N and phosphate buffer media. The results indicated that optimum gastric-resistance was only attained with the highest amount of coating material, with isoniazid almost fully released in phosphate buffer. The amount of rifampicin released from its mixture with non-coated isoniazid pellets in HCl 0.1 N was less than that released from its mixture with the enteric-coated pellets. Acrycoat L 100(r) was shown to be an effective enteric/gastric-resistant coating since the stability of rifampicin appeared to be enhanced when physical contact of this drug with isoniazid was prevented at low pH. |
| Databáze: | Directory of Open Access Journals |
| Externí odkaz: |
|