Orodispersible Delivery Systems for Verapamil Hydrochloride

Abstract

Verapamil Hydrochloride, a Class IV calcium channel antagonist, is a primary intervention for hypertension and arrhythmias. However, its clinical efficacy is restricted by a significant first-pass effect, yielding only 10%-20% systemic bioavailability. To overcome these pharmacokinetic barriers and address patient non-compliance due to dysphagia, Orodispersible Tablets (ODTs) have been developed as a high-performance alternative. This review explores the engineering of ODTs designed to liquefy instantly in the oral cavity. Success depends on the strategic use of superdisintegrants like Crospovidone and sublimation agents (e.g., camphor) to create a highly porous internal architecture. These methods facilitate rapid wicking and capillary action, often ensuring disintegration in under 30 seconds. Beyond convenience, the ODT platform offers a potential "shunt" for drug molecules to be absorbed via the pregastric mucosa, partially bypassing hepatic degradation.
Current research highlights the move toward natural polymers and factorial design optimization to balance mechanical durability with rapid dissolution. By masking the drug’s inherent bitterness through ion-exchange resins or complexation, ODTs provide a seamless, water-free delivery system. This technology represents a vital advancement in cardiovascular pharmacotherapy, ensuring rapid onset and enhanced patient-centric care.