Drug delivery is important for the treatment of chronic conditions. Implantable site-specific drug delivery devices offer direct delivery to the location of therapy, improving treatment outcomes while reducing side effects and overall associated healthcare costs.

Drug delivery may be a broad field of research on the event of novel materials or carrier systems for effective therapeutic delivery of drug. The drug delivery could also be steady, controlled, or targeted drug delivery and is usually used methods. Since the arrival of medical application systems, numerous drugs are being administered through various conventional drug delivery dosage forms like solutions, lotions, mixtures, creams, pastes, ointments, powders, suppositories, suspensions, injectable, pills, immediate release capsules and tablets etc., and so on to treat various diseases.

 There are 4 phases to check a new drug in clinical trials:

• Phase I studies usually test new drugs for the primary time in a small group of individuals to group secure dosage range and identify side effects.

• Phase II studies test treatments that are found to be safe in phase I clinical trial but now need a bigger group of human subjects to watch for any adverse effects.

• Phase III studies are conducted on larger populations and in several regions and countries, and are often the step right before a replacement treatment is approved.

• Phase IV studies happen after country approval and there's a requirement for further testing during a wide population over a extended timeframe.

Clinical Development, also called Drug Development, may be a blanket term wont to define the whole process of bringing a replacement drug or device to the market. It includes drug discovery or development, pre-clinical research (microorganisms or animals) and clinical trials (on humans).

Alpine

Associate Editor

Journal of Clinical Trials

clinicaltrials@eclinicalsci.com