A 3D-printed polymer–lipid-hybrid tablet towards the development of bespoke SMEDDS formulations

April 01, 2021

Bryce W. Barber (1), Camille Dumont (2), Philippe Caisse (2), George P. Simon (3), Ben J. Boyd (1,4)
Pharmaceutics, 13, Issue 12, April 2021: 2107. DOI: 10.3390/pharmaceutics13122107


lipid; SMEDDS; additive manufacturing; controlled release


3D printing is a rapidly growing area of interest within pharmaceutical science thanks to its versatility in creating different dose form geometries and drug doses to enable the personalisation of medicines. Research in this area has been dominated by polymer-based materials; however, for poorly water-soluble lipophilic drugs, lipid formulations present advantages in improving bioavailability. This study progresses the area of 3D-printed solid lipid formulations by providing a 3D-printed dissolvable polymer scaffold to compartmentalise solid lipid formulations within a single dosage form. This allows the versatility of different drugs in different lipid formulations, loaded into different compartments to generate wide versatility in drug release, and specific control over release geometry to tune release rates. Application to a range of drug molecules was demonstrated by incorporating the model lipophilic drugs; halofantrine, lumefantrine and clofazimine into the multicompartmental scaffolded tablets. Fenofibrate was used as the model drug in the single compartment scaffolded tablets for comparison with previous studies. The formulation-laden scaffolds were characterised using X-ray CT and dispersion of the formulation was studied using nephelometry, while release of a range of poorly water-soluble drugs into different gastrointestinal media was studied using HPLC. The studies show that dispersion and drug release are predictably dependent on the exposed surface area-to-volume ratio (SA:V) and independent of the drug. At the extremes of SA:V studied here, within 20 min of dissolution time, formulations with an SA:V of 0.8 had dispersed to between 90 and 110%, and completely released the drug, where as an SA:V of 0 yielded 0% dispersion and drug release. Therefore, this study presents opportunities to develop new dose forms with advantages in a polypharmacy context.

How Our Software Was Used

Dragonfly was used to perform the post-processing of CT data.

Author Affiliation

(1) Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Pde, Parkville, Melbourne 3052, Australia
(2) Gattefossé SAS, 36 Chemin de Genas, CEDEX, 69804 Saint-Priest, France
(3) Department of Materials Science and Engineering, Monash University, Clayton, Melbourne 3800, Australia
(4) Department of Pharmacy, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark