According to Nicholas W. Warne of Pfizer, wearable pumps, vaccine adjuvants, and disposable delivery systems are some of the most significant developments in medication delivery. Although parenteral administration remains the gold standard for drug delivery, numerous developments have been achieved that have an impact on drug formulation, delivery tools, and delivery techniques. A long way has been made in the creation of disposable delivery systems that are reliable and safe for almost all biotechnology goods and vaccinations that are administered to billions of patients every year. Before administering an injection, a medical professional can confidently grasp a drug-filled syringe and ensure that the patient has received the whole prescribed dosage. Convenience is a crucial area of competitive interest since it influences both market demand and adherence. The convenience in many therapeutic fields has been changed by single-use pre-filled pens and multi-dose auto-injectors. Adjuvants for vaccinations have significantly contributed to improving the immunogenicity of essential vaccines. The best method for delivering medications is by parenteral injection. Administration via the pulmonary (and nasal) and intradermal (and trans-dermal) routes are two research areas. Progress has been made with both strategies in preclinical models and small clinical studies.