Abstract
Bilayer tablets were developed recently for the effective production of controlled release formulations in various quality levels to give a method of successful drug delivery. Over the last three decades, as the cost and complexity of developing novel pharmacological entities have increased and as the therapeutic benefits of controlled drug administration have been recognized, considerable attention has been focused on developing sustained or controlled release drug delivery systems. It is utilized to produce a variety of antihypertensive formulations. Bilayer tablets allow for the predetermined release of two drugs in combination, separating two incompatible substances, and sustained-release tablets with one layer serving as the loading dose and the second layer serving as the maintenance dose. Bilayer tablets are advancing helpful technologies to overcome the disadvantages of single-layered tablets. However, bilayer tablet technology is resource-intensive. A thorough selection of excipients and manufacturing conditions for each technical stage is also required. The purpose of this paper is to summarize the state of art in bilayer tablet technology and to highlight the difficulties encountered during bilayer tablet manufacture, as well as the possible solutions for these obstacles. KEYWORDS: Bilayer tablet, Conventional release, Controlled release, Sustained release, Maintenance dose
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