Formulation and Evaluation of Anti-Bacterial Microemulsion Based Gel Containing Tetracycline Hydrochloride for Topical Drug Delivery

The present study was aimed at the formulation and evaluation of an antibacterial microemulsion-based gel containing Tetracycline Hydrochloride for topical drug delivery. Tetracycline Hydrochloride is a broad-spectrum antibiotic widely used for the treatment of various bacterial skin infections. However, conventional topical formulations often exhibit limited skin penetration and reduced drug retention at the site of action, resulting in suboptimal therapeutic efficacy. To overcome these limitations, a microemulsion-based gel system was developed to enhance drug solubility, permeability, stability, and localized drug delivery. Microemulsions were prepared using suitable oil, surfactant, co-surfactant, and aqueous phases and subsequently incorporated into a gel base to obtain a stable and patient-friendly formulation. The prepared formulations were evaluated for various physicochemical parameters, including appearance, pH, viscosity, spreadability, drug content, globule size, in-vitro drug release, stability, and antibacterial activity. The optimized formulation exhibited desirable characteristics such as good homogeneity, acceptable pH, enhanced drug release, improved skin permeation, and effective antibacterial activity against selected bacterial strains. Stability studies indicated that the formulation remained stable under different storage conditions without significant changes in its physicochemical properties. The results of the study suggest that the developed microemulsion-based gel is a promising topical drug delivery system for Tetracycline Hydrochloride, offering enhanced therapeutic efficacy, improved patient compliance, and effective management of bacterial skin infections. Therefore, the formulation may serve as a suitable alternative to conventional topical antibiotic preparations.