Drug/Medicine
Overview
A drug or medicine (약, Drug/Medicine) refers to a chemical substance or biological agent administered to the human body for the purpose of treating, preventing, or diagnosing diseases, or improving physiological functions. Drugs have evolved alongside human history and, as a core tool of modern medicine, have contributed to saving countless lives and improving quality of life. The entire process of drug development, safety evaluation, approval, distribution, and use undergoes strict regulation and scientific verification to ensure patient safety and maximize therapeutic effects.
Main Content
Classification of Drugs
Drugs can be classified according to various criteria. The most basic classification is based on legal regulation: prescription drugs and over-the-counter (OTC) drugs. Prescription drugs can only be purchased with a doctor's prescription and include antibiotics, anticancer drugs, and narcotic analgesics. OTC drugs can be purchased at pharmacies without a prescription, with common examples being antipyretics, analgesics, digestive aids, and cold medicines. Additionally, drugs can be classified by pharmacological action, such as antibiotics, analgesics, antihistamines, and antihypertensives, or by route of administration, such as oral medications, injections, topical preparations, and inhalants.
Mechanism of Drug Action
Drugs exert their effects by binding to specific targets in the body (e.g., receptors, enzymes, ion channels) and modulating physiological responses. For example, analgesics block receptors that transmit pain signals, while antibiotics inhibit bacterial cell wall synthesis to kill bacteria. The effect of a drug follows a dose-response relationship, and the goal of treatment is to achieve maximum efficacy at an appropriate dose while minimizing side effects. Pharmacokinetics studies the absorption, distribution, metabolism, and excretion of drugs, which is crucial for understanding changes in drug concentration in the body over time.
Drug Development Process
New drug development is a complex process that typically takes an average of 10 to 15 years and costs trillions of won. In the early stages, targets responsible for diseases are identified, and thousands to tens of thousands of candidate compounds are synthesized and screened. Subsequently, preclinical trials evaluate safety and efficacy in animal models, and if no issues are found, three phases of clinical trials are conducted. Phase 1 confirms safety and dosage in a small number of healthy volunteers; Phase 2 evaluates efficacy and side effects in a small number of patients; and Phase 3 demonstrates effectiveness compared to existing treatments in a large patient population. After passing all trials, an application for approval is submitted to regulatory agencies (e.g., the U.S. FDA, Korea's Ministry of Food and Drug Safety), and marketing is only permitted upon approval.
Drug Safety and Side Effects
All drugs carry the potential for side effects. Side effects can be predictable (e.g., drowsiness from antihistamines) or unpredictable (e.g., allergic reactions). Drug interactions are also a significant safety concern, as taking multiple medications simultaneously can enhance or reduce their effects. To prevent this, patients should inform their doctor or pharmacist of all medications they are taking, including prescription drugs, OTC drugs, and health functional foods. Additionally, misuse or abuse of drugs can lead to tolerance, dependence, and addiction, requiring caution.
Proper Use of Drugs
To use drugs safely and effectively, it is most important to strictly follow the prescribed dosage and administration instructions. Dosages should not be arbitrarily changed or discontinued, and expired medications should not be taken. Drugs should be stored in their original containers, kept in a cool place away from direct sunlight and moisture. Furthermore, even if symptoms are similar, sharing medications with others can be dangerous. Any questions about medications should always be discussed with a doctor or pharmacist.
Latest Trends
As of 2024-2025, several important trends are observed in the field of pharmacy. First, the development of personalized medicine is accelerating. Advances in genomic analysis technology are expanding precision medicine, which predicts drug efficacy and side effects based on an individual's genetic characteristics and selects optimal treatments. Second, AI and big data are being actively utilized in new drug development. Artificial intelligence contributes to rapidly identifying promising candidate compounds among numerous chemicals and improving the efficiency of clinical trials. Third, GLP-1 receptor agonists (e.g., Ozempic, Wegovy) are gaining significant attention as obesity treatments, with research expanding beyond diabetes to indications such as cardiovascular disease and dementia. Fourth, mRNA technology, following the success of COVID-19 vaccines, is broadening its application to infectious disease vaccines, cancer therapeutic vaccines, and treatments for rare diseases. Finally, as antibiotic resistance becomes a serious issue, international efforts are intensifying to develop new classes of antibiotics and reduce antibiotic use.
Related Topics
- [[Safe Use of Medicines]]
- [[New Drug Development]]
- [[Drug Interactions]]
- [[Clinical Trials]]
- [[Pharmacy]]
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