A pharmaceutical molecule is transported to its target site via various strategies, formulations, production processes, storage systems, and technologies in order to provide the intended therapeutic effect. To maximize efficacy and safety, as well as to enhance patient comfort and compliance, principles relating to drug production, route of administration, site-specific targeting, metabolism, and toxicity are applied. By combining different excipients, drug carriers, and medical devices with a drug formulation, drug delivery aims to change a medication's pharmacokinetics and specificity. To enhance treatment results, there is an added focus on extending a drug's duration of action and bioavailability. The improvement of medicine administration personnel safety has also been the subject of some studies. To lower the danger of needlestick injuries, for instance, many kinds of microneedle patches have been created for giving vaccinations and other drugs. The idea of drug delivery is closely related to dose form and mode of administration; the latter is occasionally included in the definition. Although medication delivery and the route of administration are frequently used interchangeably, they are two different ideas. While drug delivery also includes the engineering of delivery systems and can comprise various dosage forms and devices used to administer medication through the same route, route of administration refers to the path a drug takes to enter the body. Oral, parenteral (injected), sublingual, topical, transdermal, inhalation, rectal, and vaginal modes, etc.