Drug formulation is the process of combining various chemical substances to create a medication that is safe, effective, and easy to use. This involves selecting the right ingredients, such as active pharmaceutical ingredients (APIs) and excipients, which help in the drug's stability, absorption, and overall performance. The goal of drug formulation is to ensure that the medication delivers the desired therapeutic effect while minimizing side effects. Different forms of drugs, such as tablets, capsules, and injections, are developed based on how they will be administered and how quickly they need to act in the body.