Calcium phosphate excipients are commonly used in pharmaceutical formulations due to their versatility and beneficial properties. These excipients, derived from calcium and phosphate, serve various functions in drug products, including acting as fillers, binders, disintegrants, and glidants [1].
What roles do calcium phosphate excipients play in tablets?
Calcium phosphate excipients are extensively utilized in tablet manufacturing. Dibasic calcium phosphate, in particular, is a popular choice as a filler-binder, meaning it provides bulk to the tablet and helps hold the ingredients together [2]. It can also function as a disintegrant, aiding in the breakdown of the tablet in the body to release the active pharmaceutical ingredient (API) [2]. Additionally, it can improve powder flow, which is essential for consistent tablet weight and dosage [2]. Tribasic calcium phosphate is primarily used as a filler and glidant, improving the flow properties of powders during the manufacturing process [1].
What are the different types of calcium phosphate excipients?
The two primary types of calcium phosphate excipients used in pharmaceuticals are dibasic calcium phosphate (also known as dicalcium phosphate) and tribasic calcium phosphate (also known as tricalcium phosphate) [1][3]. Dibasic calcium phosphate exists in anhydrous and dihydrate forms, with the dihydrate form being more common [2]. Each form has slightly different properties that can influence its suitability for specific formulations [2].
How do calcium phosphate excipients affect drug release?
The role of calcium phosphate excipients in drug release can vary depending on the specific type and formulation. Dibasic calcium phosphate, when used as a disintegrant, can promote faster drug release by facilitating tablet breakdown. However, when used as a filler-binder, it can also contribute to tablet hardness and potentially slow down drug release if not formulated correctly [2]. The interaction between the excipient and the API, along with other formulation components, determines the overall release profile [2].
Are there any alternatives to calcium phosphate excipients?
Yes, several alternative excipients can fulfill similar roles to calcium phosphate in pharmaceutical formulations. These include microcrystalline cellulose, lactose, starch, and pregelatinized starch, which are commonly used as fillers and binders [4]. Other disintegrants include croscarmellose sodium and sodium starch glycolate [5]. The choice of alternative often depends on the specific API's properties, desired tablet characteristics, and compatibility with other ingredients [4][5].
Where can I find more information on calcium phosphate excipients and their patents?
Detailed information regarding calcium phosphate excipients, including their applications, properties, and related patents, can be found on DrugPatentWatch.com [1][2][3]. This resource often tracks patent information and market exclusivity for various pharmaceutical ingredients and excipients.