Sayali Pagire*
Spansule technology is a significant innovation in pharmaceutical drug delivery methods, designed to overcome the constraints of traditional dosage forms. This technology, first introduced in the early 1950s by Smith, Kline & French with products such as Dexedrine Spansules, was designed to deliver medications in a regulated and sustained manner, allowing for consistent therapeutic levels in the bloodstream over extended periods. [1,3] The term “spansule” is a combination of “span” and “capsule,” signifying the capacity to release medications gradually over time. Spansules are gelatin capsules that contain hundreds of coated pellets or granules. Each pellet is designed with distinct coating thicknesses and compositions that disintegrate at varying rates once inside the gastrointestinal tract. These coatings are often composed of hydrophilic and hydrophobic polymers, including ethyl cellulose, hydroxypropyl methylcellulose (HPMC), cellulose acetate phthalate, Eudragit, and carnauba wax. [2,4] By changing the coating materials, spansules can be designed to offer rapid, delayed, or sustained release, or a mix of the three—making them ideal for biphasic or triphasic drug delivery. [5] The primary purpose of spansule technology is to maintain consistent plasma medication concentrations, reduce dose frequency, reduce peak-to-trough fluctuations, and improve patient compliance. This is especially useful in chronic diseases such as hypertension, diabetes, ADHD, and psychiatric disorders, where consistent medication levels are critical for optimal therapy. [6] Several innovative manufacturing techniques are used to manufacture spansules, including extrusion-spheronization, coacervation-phase separation, fluidized bed coating, spray drying, and pan coating. Each approach contributes to the production of homogenous, stable pellets with consistent drug release characteristics. [1,4] Despite their many advantages, spansules have significant drawbacks, including difficult production methods, greater prices, and the possibility of dose dumping if the coating’s integrity is compromised. [3] Nonetheless, the capacity to tailor drug delivery patterns and improve therapeutic outcomes makes capsule technology a promising platform in modern pharmaceutics.
Definition: - Spansules are capsules carrying medicines (in the form of granules) coated with materials that have slow dissolving rates, allowing the medicament to be supplied at different times. In other terms, it is a mix of two words, span and capsule, resulting in a capsule that slowly releases medication over a variable period of time.
10.5281/zenodo.17294601