RT School

Routes of drug administration are essential in pharmacology as they influence the drug’s absorption, distribution, metabolism, and excretion. The concept map includes common routes such as oral, parenteral (injection), transdermal (skin patches), and rectal administration, each with unique characteristics. Oral administration is most common due to convenience but involves first-pass metabolism in the liver, which can reduce drug bioavailability. Parenteral routes, including intravenous (IV), intramuscular (IM), and subcutaneous (SC) injections, bypass the digestive tract and provide rapid or controlled drug delivery directly into the systemic circulation or tissues. This is critical in emergency settings or when drugs are poorly absorbed orally. Transdermal delivery uses patches to allow controlled drug release through the skin into systemic circulation, useful for medications requiring steady plasma levels, such as nicotine replacement therapy. Rectal administration is advantageous when oral intake is not possible and can bypass part of the first-pass metabolism, delivering drugs effectively when nausea or vomiting occurs. Understanding these routes supports informed decisions on drug selection and patient counseling, enhancing therapeutic efficacy and safety.