Personalized medicine aims to provide the right drug to the right patient at the right time and dose based on their genetic profile. It enables more effective medicines with fewer side effects. Benefits include better drug delivery through avoiding trial and error, reduced costs from quickly identifying clinical trial failures, and improved drug efficiency. Personalized medicine development relies on pharmacogenomics, which studies how genes affect drug response, and pharmacogenetics, which links genotypes to drug metabolism abilities. Factors like age, sex, disease, drug interactions, and genetic polymorphisms influence drug absorption and effects. 3D printing and telemedicine help enable customized drug delivery through remote dispensing and counseling.