Aspirin bilayer tablets prepared with 3D printer for drug controlled release / 中国药学杂志

OBJECTIVE: Taking aspirin as a model drug, the feasibility of the controlled release of aspirin tablets was discussed, which was based on the individual demand of 3D printing technology. METHODS: The experiment selected 10 000 mPa·s hydroxypropyl methyl cellulose (HPMC10000) and polyacrylic acid (PAA) as a hydrophilic matrix sustained-release layer; hydroxypropyl methyl cellulose 100 mPa·s (HPMC100) as a quick release layer binder, sodium carboxymethyl starch (CMS-Na) and sodium carboxymethyl starch (SSG) as a quick release layer disintegrating agent, the use of 3D printer to print the slow release of aspirin tablets. Select 100 mg·mL-1 and polyvinylpyrrolidone (PVPK30) as a quick release layer binder, crosslinking sodium carboxymethyl cellulose (CC-Na) as a quick release layer disintegrating agent, hydroxypropyl methyl cellulose (HPMC100) as the matrix material release layer, with the traditional press pressing speed of aspirin sustained-release tablet, as contrast agents. The physical and chemical properties of tablets produced in two different modes of production (film weight difference, hardness and thickness) and release profile were investigated. RESULTS: The physical and chemical properties of the two tablets are all in the Pharmacopoeia. Comparison of two kinds of drug release curve showed that the ASA-HPMC (14%, ω) and the press release curve of double layer tablets printing film is similar, and the release rate is higher than the tablet (6% ω. ASA-HPMC double layer tablets), ASA-HPMC (8%, ω) and ASA-HPMC (10%, ω) printing film final release amount increased with hydrophilic matrix HPMC. CONCLUSION: 3D printers print different shapes of tablets with different release profiles, in which the release of the package is higher than the other tablets.

Development and evaluation of bilayer tablets of combination of antibiotics for the treatment of sexually transmitted disease

ABSTRACT The present research work was envisaged to develop bilayer tablets to improve therapeutic efficacy of antibiotic combination for the treatment of sexually transmitted diseases. The combination of two antibiotics i.e. cefixime trihydrate and ofloxacin were used for the preparation of bilayer tablets which act against genito-urinary infections. The formulations comprise of cefixime trihydrate as immediate release layer formulated using different superdisintegrants and ofloxacin as extended release layer containing HPMC K100M. Evaluation of bilayer tablets were performed for the immediate release cefixime layer and sustain release ofloxacin layer with optimization of excipients. The immediate release layer of cefixime showed complete release within 30 min and ofloxacin release was extended up to 24 hours. The similarity factor value of ofloxacin sustained release layer was found to be 87.01 for initial and 80.35 after 3 months stability when compared with marketed reference product. The present study revealed that cefixime trihydrate and ofloxacin bilayer tablets were successfully developed for the use against sexually transmitted infections.

BI-Layer technology- an emerging trend: A review.

Combination therapy has various advantages over monotherapy. In the last decade, interest in developing a combination of two or more Active Pharmaceutical Ingredients (API) in a single dosage form (monolithic or bilayer tablet) has increased in the pharmaceutical industry, promoting patient convenience and compliance. Bilayer tablets can be a primary option to avoid chemical incompatibilities between API by physical separation, and to enable the development of different drug release profiles (immediate release with extended release). Several pharmaceutical companies are currently developing bi-layer tablets, for a variety of reasons: patent extension, therapeutic, marketing to name a few. To reduce capital investment, quite often existing but modified tablet presses are used to develop and produce such tablets. This article explains why the development and production of quality bi-layer tablets needs to be carried out on purpose-built tablet presses to overcome common bi-layer problems, such as layer-separation, insufficient hardness, inaccurate individual layer weight control, cross-contamination between the layers, reduced yield etc. Using a modified tablet press may therefore not be best approach in producing a quality bi-layer tablet under GMP conditions, especially when high production output is required. There are various applications of the bi-layer tablet consists of monolithic partially coated or multilayered matrices.

Formulation and Evaluation of Bilayer Tablets of Diclofrenac Sodium with Ranitidine HCL for Sustained and Immediate Release.

The aim of present study is to formulate and evaluate the bilayered tablets containing Diclofenac Sodium in the sustained release (SR) portion and Ranitidine HCl in the immediate release (IR) portion in order to produce a single tablet containing two different classes of drugs as widely prescribed by doctors and to have better patient compliance.The sustained release layer of Diclofenac Sodium was prepared by using different grades of HPMC like, HPMC E15, HPMC K4M, K100M, and Ethyl Cellulose with cross carmellose along with other excipients like Magnesium stearate, Microcrystalline cellulose & PVP by wet granulation technique. The Immediate release layer of Ranitidine Hcl was prepared by direct compression Method. The powders were evaluated for their flow properties and the finished tablets were evaluated for their physical parameters. The drug release study of Ranitidine HCl and Diclofenac Sodium were evaluated using USP-XXII paddle type dissolution apparatus. The release rate of Ranitidine HCl was studied for 45 min using water as media and that of Diclofenac Sodium was studied for 2 h in 1.2pH buffer followed by 6 h in pH 6.8 phosphate buffer media using a developed HPLC method. The release rate of ranitidine HCl from all the formulations was more than 80% at 45 min. In case of HPMC E15, HPMC K4M, K100M based tablets with the increasing of polymer content the release mechanism moved to super case. Total four trial batches of each drug have been manufactured to optimize and develop a robust and stable formulation, the stability studies of the products also comply with ICH guidelines.