Effect of grinding on in vitro fl oating behaviour of effervescent matrix tablets of ciprofl oxacin hydrochloride: Negative impact on initial buoyancy. Journal of Pharmaceutical Negative Results, [S. l.], v. 2, n. 1, p. 8–13, 2011. Disponível em: https://www.pnrjournal.com/index.php/home/article/view/20.. Acesso em: 22 jun. 2026.