Formulation and Evaluation of Bilayer Floating Tablet Containing Verapamil Hydrochloride

Shivendra Pratap Singh*, Navneet Kumar Verma, Abhay Pratap Singh, Reena Singh
Department of Pharmacy, Kailash Institute of Pharmacy and Management, GIDA, Gorakhpur, U.P. India-273209

A B S T R A C T
The objective of the present work was to develop a bilayer-floating tablet for Verapamil HCl using direct compression technology using polymers such as HPMC K100 and Carbopol 940. Sodium bicarbonate and citric acid were used as a gas generating agent. All the bi-layered floating tablet formulations were subjected to post-compression evaluation parameters such as hardness, friability, weight variation, thickness, drug content, lag time subsequently buoyancy time, and in-vitro dissolution studies. The assay of the formulation revealed that the drug content was within the limits. In-vitro floating revealed that all the formulations showed buoyancy of more than 12 hours. Dissolution tests were performed using USP dissolution apparatus at 75 rpm in pH 1.2 buffers. The tablet split in to 2 layers i.e. floating and immediate layer in the dissolution medium, which exhibited biphasic release of Verapamil HCl. The formulation F3 released 98.24% of drug at the end of 12hr. The in-vitro drug release data was fitted into various kinetic models and the best fit release kinetics was achieved with Peppas model.
Keywords: Verapamil hydrochloride, HPMC, Carbopol, Bilayer floating tablet