File Name: drugs and their uses in treatment of disease .zip
- Understanding Medicines and What They Do
- A to Z List of Cancer Drugs
- U.S. Food and Drug Administration
Therapeutics , treatment and care of a patient for the purpose of both preventing and combating disease or alleviating pain or injury.
Medicine is the art ,  science ,  and practice  of caring for a patient and managing the diagnosis , prognosis , prevention , treatment or palliation of their injury or disease. Medicine encompasses a variety of health care practices evolved to maintain and restore health by the prevention and treatment of illness. Contemporary medicine applies biomedical sciences , biomedical research , genetics , and medical technology to diagnose , treat, and prevent injury and disease, typically through pharmaceuticals or surgery , but also through therapies as diverse as psychotherapy , external splints and traction , medical devices , biologics , and ionizing radiation , amongst others.
Medicine has been practiced since prehistoric times , during most of which it was an art an area of skill and knowledge frequently having connections to the religious and philosophical beliefs of local culture. For example, a medicine man would apply herbs and say prayers for healing, or an ancient philosopher and physician would apply bloodletting according to the theories of humorism. In recent centuries, since the advent of modern science , most medicine has become a combination of art and science both basic and applied , under the umbrella of medical science.
While stitching technique for sutures is an art learned through practice, the knowledge of what happens at the cellular and molecular level in the tissues being stitched arises through science.
Prescientific forms of medicine are now known as traditional medicine and folk medicine. They remain commonly used with, or instead of, scientific medicine and are thus called alternative medicine. As an example, evidence on the effectiveness of acupuncture is "variable and inconsistent" for any condition,  but is generally safe when done by an appropriately trained practitioner.
This can encompass an array of practices and practitioners, irrespective of whether they are prescientific traditional medicine and folk medicine or modern pseudo-scientific , including chiropractic which rejects modern scientific germ theory of disease instead believing without evidence that human diseases are caused by invisible subluxation of the bones, predominantly of the spine and less so of other bones , with just over half of chiropractors also rejecting the science of immunization.
Medical availability and clinical practice varies across the world due to regional differences in culture and technology.
Modern scientific medicine is highly developed in the Western world , while in developing countries such as parts of Africa or Asia, the population may rely more heavily on traditional medicine with limited evidence and efficacy and no required formal training for practitioners. In modern clinical practice, physicians and physician assistants personally assess patients in order to diagnose , prognose , treat, and prevent disease using clinical judgment.
The doctor-patient relationship typically begins an interaction with an examination of the patient's medical history and medical record , followed by a medical interview  and a physical examination. Basic diagnostic medical devices e. After examination for signs and interviewing for symptoms , the doctor may order medical tests e.
Differential diagnosis methods help to rule out conditions based on the information provided. During the encounter, properly informing the patient of all relevant facts is an important part of the relationship and the development of trust. The medical encounter is then documented in the medical record, which is a legal document in many jurisdictions. The diagnosis and treatment may take only a few minutes or a few weeks depending upon the complexity of the issue.
The components of the medical interview  and encounter are:. The physical examination is the examination of the patient for medical signs of disease, which are objective and observable, in contrast to symptoms that are volunteered by the patient and not necessarily objectively observable. Four actions are the basis of physical examination: inspection , palpation feel , percussion tap to determine resonance characteristics , and auscultation listen , generally in that order although auscultation occurs prior to percussion and palpation for abdominal assessments.
The clinical examination involves the study of: . It is to likely focus on areas of interest highlighted in the medical history and may not include everything listed above. The treatment plan may include ordering additional medical laboratory tests and medical imaging studies, starting therapy, referral to a specialist, or watchful observation.
Follow-up may be advised. Depending upon the health insurance plan and the managed care system, various forms of " utilization review ", such as prior authorization of tests, may place barriers on accessing expensive services. The medical decision-making MDM process involves analysis and synthesis of all the above data to come up with a list of possible diagnoses the differential diagnoses , along with an idea of what needs to be done to obtain a definitive diagnosis that would explain the patient's problem.
On subsequent visits, the process may be repeated in an abbreviated manner to obtain any new history, symptoms, physical findings, and lab or imaging results or specialist consultations. Contemporary medicine is in general conducted within health care systems.
Legal, credentialing and financing frameworks are established by individual governments, augmented on occasion by international organizations, such as churches. The characteristics of any given health care system have significant impact on the way medical care is provided. From ancient times, Christian emphasis on practical charity gave rise to the development of systematic nursing and hospitals and the Catholic Church today remains the largest non-government provider of medical services in the world.
This is intended to ensure that the entire population has access to medical care on the basis of need rather than ability to pay. Delivery may be via private medical practices or by state-owned hospitals and clinics, or by charities, most commonly by a combination of all three. Most tribal societies provide no guarantee of healthcare for the population as a whole. In such societies, healthcare is available to those that can afford to pay for it or have self-insured it either directly or as part of an employment contract or who may be covered by care financed by the government or tribe directly.
Transparency of information is another factor defining a delivery system. While the US healthcare system has come under fire for lack of openness,  new legislation may encourage greater openness. There is a perceived tension between the need for transparency on the one hand and such issues as patient confidentiality and the possible exploitation of information for commercial gain on the other.
Provision of medical care is classified into primary, secondary, and tertiary care categories. Primary care medical services are provided by physicians , physician assistants , nurse practitioners , or other health professionals who have first contact with a patient seeking medical treatment or care. These include treatment of acute and chronic illnesses, preventive care and health education for all ages and both sexes.
Secondary care medical services are provided by medical specialists in their offices or clinics or at local community hospitals for a patient referred by a primary care provider who first diagnosed or treated the patient. These include both ambulatory care and inpatient services, Emergency departments , intensive care medicine , surgery services, physical therapy , labor and delivery , endoscopy units, diagnostic laboratory and medical imaging services, hospice centers, etc.
Some primary care providers may also take care of hospitalized patients and deliver babies in a secondary care setting. Tertiary care medical services are provided by specialist hospitals or regional centers equipped with diagnostic and treatment facilities not generally available at local hospitals.
These include trauma centers , burn treatment centers, advanced neonatology unit services, organ transplants , high-risk pregnancy, radiation oncology , etc. Modern medical care also depends on information — still delivered in many health care settings on paper records, but increasingly nowadays by electronic means. In low-income countries, modern healthcare is often too expensive for the average person. International healthcare policy researchers have advocated that "user fees" be removed in these areas to ensure access, although even after removal, significant costs and barriers remain.
Separation of prescribing and dispensing is a practice in medicine and pharmacy in which the physician who provides a medical prescription is independent from the pharmacist who provides the prescription drug. In the Western world there are centuries of tradition for separating pharmacists from physicians.
In Asian countries, it is traditional for physicians to also provide drugs. Working together as an interdisciplinary team , many highly trained health professionals besides medical practitioners are involved in the delivery of modern health care.
Examples include: nurses , emergency medical technicians and paramedics, laboratory scientists, pharmacists , podiatrists , physiotherapists , respiratory therapists , speech therapists , occupational therapists , radiographers, dietitians , and bioengineers , medical physics , surgeons , surgeon's assistant , surgical technologist.
The scope and sciences underpinning human medicine overlap many other fields. Dentistry , while considered by some a separate discipline from medicine, is a medical field.
A patient admitted to the hospital is usually under the care of a specific team based on their main presenting problem, e. Physicians have many specializations and subspecializations into certain branches of medicine, which are listed below. There are variations from country to country regarding which specialties certain subspecialties are in. In the broadest meaning of "medicine", there are many different specialties. In the UK, most specialities have their own body or college, which has its own entrance examination.
These are collectively known as the Royal Colleges, although not all currently use the term "Royal". The development of a speciality is often driven by new technology such as the development of effective anaesthetics or ways of working such as emergency departments ; the new specialty leads to the formation of a unifying body of doctors and the prestige of administering their own examination. Within medical circles, specialities usually fit into one of two broad categories: "Medicine" and "Surgery.
At present, some specialties of medicine do not fit easily into either of these categories, such as radiology, pathology, or anesthesia. Surgery is an ancient medical specialty that uses operative manual and instrumental techniques on a patient to investigate or treat a pathological condition such as disease or injury , to help improve bodily function or appearance or to repair unwanted ruptured areas for example, a perforated ear drum. Surgeons must also manage pre-operative, post-operative, and potential surgical candidates on the hospital wards.
Surgery has many sub-specialties, including general surgery ,  ophthalmic surgery ,  cardiovascular surgery , colorectal surgery ,  neurosurgery ,  oral and maxillofacial surgery ,  oncologic surgery ,  orthopedic surgery ,  otolaryngology ,  plastic surgery ,  podiatric surgery , transplant surgery , trauma surgery ,  urology ,  vascular surgery ,  and pediatric surgery .
In some centers, anesthesiology is part of the division of surgery for historical and logistical reasons , although it is not a surgical discipline. Other medical specialties may employ surgical procedures, such as ophthalmology and dermatology , but are not considered surgical sub-specialties per se. Surgical training in the U.
Sub-specialties of surgery often require seven or more years. In addition, fellowships can last an additional one to three years. Because post-residency fellowships can be competitive, many trainees devote two additional years to research. Thus in some cases surgical training will not finish until more than a decade after medical school. Furthermore, surgical training can be very difficult and time-consuming. Internal medicine is the medical specialty dealing with the prevention, diagnosis, and treatment of adult diseases.
Because their patients are often seriously ill or require complex investigations, internists do much of their work in hospitals. Formerly, many internists were not subspecialized; such general physicians would see any complex nonsurgical problem; this style of practice has become much less common. In modern urban practice, most internists are subspecialists: that is, they generally limit their medical practice to problems of one organ system or to one particular area of medical knowledge.
For example, gastroenterologists and nephrologists specialize respectively in diseases of the gut and the kidneys. In the Commonwealth of Nations and some other countries, specialist pediatricians and geriatricians are also described as specialist physicians or internists who have subspecialized by age of patient rather than by organ system. Elsewhere, especially in North America, general pediatrics is often a form of primary care. There are many subspecialities or subdisciplines of internal medicine :.
Training in internal medicine as opposed to surgical training , varies considerably across the world: see the articles on medical education and physician for more details. In North America, it requires at least three years of residency training after medical school, which can then be followed by a one- to three-year fellowship in the subspecialties listed above.
In general, resident work hours in medicine are less than those in surgery, averaging about 60 hours per week in the US. This difference does not apply in the UK where all doctors are now required by law to work less than 48 hours per week on average. The following are some major medical specialties that do not directly fit into any of the above-mentioned groups:. Medical education and training varies around the world. It typically involves entry level education at a university medical school , followed by a period of supervised practice or internship , or residency.
This can be followed by postgraduate vocational training. A variety of teaching methods have been employed in medical education, still itself a focus of active research. Since knowledge, techniques, and medical technology continue to evolve at a rapid rate, many regulatory authorities require continuing medical education.
Medical practitioners upgrade their knowledge in various ways, including medical journals , seminars, conferences, and online programs.
Understanding Medicines and What They Do
Victorian government portal for older people, with information about government and community services and programs. Type a minimum of three characters then press UP or DOWN on the keyboard to navigate the autocompleted search results. A side effect is an unwanted symptom caused by medical treatment. All medicines can cause side effects, including prescription, over-the-counter and complementary medicines. Complementary medicines include herbal preparations, vitamins, and some products dispensed by naturopaths and other practitioners of complementary medicine. Around , Australians are admitted to hospital every year because of problems with their medicines, including side effects.
Learn how medication-assisted treatment MAT is used to treat substance use disorders as well as sustain recovery and prevent overdose. Research shows that a combination of medication and therapy can successfully treat these disorders, and for some people struggling with addiction, MAT can help sustain recovery. MAT is also used to prevent or reduce opioid overdose. Learn about many of the substance use disorders that MAT is designed to address. MAT is primarily used for the treatment of addiction to opioids such as heroin and prescription pain relievers that contain opiates. The prescribed medication operates to normalize brain chemistry, block the euphoric effects of alcohol and opioids, relieve physiological cravings, and normalize body functions without the negative and euphoric effects of the substance used. In , an estimated 2 million people had an opioid use disorder which includes prescription pain medication containing opiates and heroin.
A to Z List of Cancer Drugs
A drug is any substance that causes a change in an organism's physiology or psychology when consumed. Consumption of drugs can be via inhalation , injection , smoking , ingestion , absorption via a patch on the skin, suppository , or dissolution under the tongue. In pharmacology , a drug is a chemical substance, typically of known structure, which, when administered to a living organism, produces a biological effect. Pharmaceutical drugs are often classified into drug classes —groups of related drugs that have similar chemical structures , the same mechanism of action binding to the same biological target , a related mode of action , and that are used to treat the same disease.
A medication also referred to as medicine , pharmaceutical drug , medicinal drug or simply drug is a drug used to diagnose , cure , treat , or prevent disease. Drugs are classified in multiple ways. One of the key divisions is by level of control , which distinguishes prescription drugs those that a pharmacist dispenses only on the order of a physician , physician assistant , or qualified nurse from over-the-counter drugs those that consumers can order for themselves.
For many people, taking medication is a regular part of their daily routine, and these medicines are relied upon to treat disease and improve health. Although medicines can make you feel better and help you get well, it's important to know that all medicines, both prescription and over-the-counter, have risks as well as benefits. The benefits of medicines are the helpful effects you get when you use them, such as lowering blood pressure, curing infection, or relieving pain.
U.S. Food and Drug Administration
Sometimes it seems like there are more medicines than there are diseases, and it can be hard to keep them straight. Some can be bought over the counter at pharmacies or other stores. Others require a doctor's prescription. Some are available only in hospitals.
Use the A to Z list below to find consumer-friendly information about drugs for cancer and conditions related to cancer. The list is in alphabetical order by generic name and brand name. You can also find this information on our pages organized by cancer type and cancer-related condition:. This page lists and links to NCI's pages of drugs approved for specific types of cancer in adults and children. This page lists and links to NCI's pages of drugs approved for specific types of cancer in children. People with cancer may have conditions caused by the cancer or its treatment.
The last chapter is devoted to the description of two different autoimmune diseases;. multiple sclerosis (MS) and psoriasis. Up to date there is no known cure for.