Mannitol is used as an excipient in pharmaceutical formulations, primarily serving as a diluent or filler in tablets and capsules [1]. It is also utilized as a binder and a disintegrant [1]. Its sweet taste and smooth texture make it suitable for use in chewable tablets and orally disintegrating tablets [2].
How does mannitol work in drug formulations?
Mannitol's effectiveness as an excipient stems from its physical and chemical properties. It is a sugar alcohol that is not readily metabolized by the body, making it a good choice for various drug delivery systems [1]. Its crystalline structure allows it to be compressed into tablets, and its solubility aids in the disintegration of these tablets once ingested, facilitating drug release [2].
Why is mannitol preferred for orally disintegrating tablets?
Orally disintegrating tablets (ODTs) are designed to dissolve rapidly in the mouth without the need for water. Mannitol's low heat of solution means it does not create a cooling sensation upon dissolving, which can be unpleasant for patients. Its pleasant taste and smooth mouthfeel contribute to better patient compliance, particularly for pediatric and geriatric populations [2].
What are the alternatives to mannitol in drug formulations?
Other common diluents and fillers used in tablet manufacturing include lactose, microcrystalline cellulose, starch, and dicalcium phosphate [1]. For ODTs, other excipients like sucrose, sorbitol, xylitol, and spray-dried lactose are also employed, each offering different characteristics in terms of taste, dissolution, and compressibility [2].
Can mannitol be used for anything other than an excipient in drugs?
Mannitol has direct therapeutic uses in medicine. It is administered intravenously as an osmotic diuretic to reduce intracranial pressure, intraocular pressure, and to promote diuresis in certain medical conditions [3]. However, its use as an excipient in oral solid dosage forms is distinct from its pharmacological applications.