Самолечение: причины, риски и психологические аспекты.

Unsupervised use of drugs and other substances
drug use without supervision of a physician
Self medication, sometime called do it yourself (DIY) medicine, is a human behavior in which an individual uses a substance or any exogenous influence to self administer treatment for physical or psychological conditions, for example headaches or fatigue. The substances most widely used in self medication are over the counter drugs and dietary supplements, which are used to treat common health issues at home. These do not require a doctor's prescription to obtain and, in some countries, are available in supermarkets and convenience stores. The field of psychology surrounding the use of psychoactive drugs is often specifically in relation to the use of recreational drugs, alcohol, comfort food, and other forms of behavior to alleviate symptoms of mental distress, stress and anxiety, including mental illnesses or psychological trauma. Such treatment may cause serious detriment to physical and mental health if motivated by addictive mechanisms. In postsecondary (university and college) students, self medication with "study drugs" such as Adderall, Ritalin, and Concerta has been widely reported and discussed in literature. Unverified and unregulated third party health claims are used to market dietary supplements. Self medication is often seen as gaining personal independence from established medicine, and it can be seen as a human right, implicit in, or closely related to the right to refuse professional medical treatment. Self medication can cause unintentional self harm. Self medication with antibiotics has been identified as one of the primary reasons for the evolution of antimicrobial resistance. Sometimes self medication or DIY medicine occurs because patients disagree with a doctor's interpretation of their condition, to access experimental therapies that are not available to the public, or because of legal bans on healthcare, as in the case of some transgender people or women seeking self induced abortion. Other reasons for relying on DIY medical care is to avoid health care prices in the United States and anarchist beliefs.

Generally speaking, self medication is defined as "the use of drugs to treat self diagnosed disorders or symptoms, or the intermittent or continued use of a prescribed drug for chronic or recurrent disease or symptoms". The self medication hypothesis (SMH) originated in papers by Edward Khantzian, Mack and Schatzberg, David F. Duncan, and a response to Khantzian by Duncan. The SMH initially focused on heroin use, but a follow up paper added cocaine. The SMH was later expanded to include alcohol, and finally all drugs of addiction. Khantzian revisited the SMH, suggesting there is more evidence that psychiatric symptoms, rather than personality styles, lie at the heart of drug use disorders. Data obtained in the Epidemiologic Catchment Area Study demonstrated that only 20% of drug users ever experience an episode of drug abuse (Anthony & Helzer, 1991), while data obtained from the National Comorbidity Study demonstrated that only 15% of alcohol users and 15% of illicit drug users ever become dependent. A crucial determinant of whether a drug user develops drug abuse is the presence or absence of negative reinforcement, which is experienced by problematic users, but not by recreational users. According to Duncan, drug dependence is an avoidance behavior, where an individual finds a drug that produces a temporary escape from a problem, and taking the drug is reinforced as an operant behavior. While this may provide immediate relief of some symptoms such as anxiety, it may evoke and/or exacerbate some symptoms of several kinds of mental illnesses that are already latently present, and may lead to addiction or physical dependency, among other side effects of long term use of the drug. This does not differ significantly from the potential effects of drugs provided by physicians, which are equally capable of producing dependency and/or addiction and also have side effects arising from long term use. People with post traumatic stress disorder have been known to self medicate, as well as many individuals without this diagnosis who have experienced psychological trauma. Due to the different effects of the different classes of drugs, the SMH postulates that the appeal of a specific class of drugs differs from person to person. In fact, some drugs may be aversive for individuals for whom the effects could worsen affective deficits.

People with social anxiety disorder commonly use alcohol to overcome their highly set inhibitions.

Cannabis is paradoxical in that it simultaneously produces stimulating, sedating and mildly psychedelic properties and both anxiolytic or anxiogenic properties, depending on the individual and circumstances of use. Depressant properties are more obvious in occasional users, and stimulating properties are more common in chronic users. Khantzian noted that research had not sufficiently addressed a theoretical mechanism for cannabis, and therefore did not include it in the SMH. Of those who seek help from mental health services for conditions including anxiety disorders such as panic disorder or social phobia, approximately half have alcohol or benzodiazepine dependence issues. Nicotine addiction seems to worsen mental health problems. Nicotine withdrawal depresses mood, increases anxiety and stress, and disrupts sleep. Although nicotine products temporarily relieve their nicotine withdrawal symptoms, an addiction causes stress and mood to be worse on average, due to mild withdrawal symptoms between hits. Nicotine addicts need the nicotine to temporarily feel normal. Nicotine industry marketing has claimed that nicotine is both less harmful and therapeutic for people with mental illness, and is a form of self medication. This claim has been criticised by independent researchers.

In 89% of countries, antibiotics can be prescribed only by a doctor and supplied only by a pharmacy. Self medication with antibiotics is defined as "the taking of medicines on one's own initiative or on another person's suggestion, who is not a certified medical professional". It has been identified as one of the primary reasons for the evolution of antimicrobial resistance. Many people resort to that out of necessity when access to a physician is unavailable because of lockdowns and GP surgery closures, or when the patients have a limited amount of time or money to see a prescribing doctor. While being cited as an important alternative to a formal healthcare system where it may be lacking, self medication can pose a risk to both the patient and community as a whole. The reasons behind self medication are unique to each region and can relate to health system, societal, economic, health factors, gender, and age. Risks include allergies, lack of cure, and even death. Besides developing countries, self medication with antibiotics is also a problem for higher income countries. In the European Union the average prevalence was 7% in 2016 with the highest rates in southern countries. There are high rates of self medication with antibiotics in Russia (83%), Central America (19%) and Latin America (14 26%) too. Two significant issues with self medication are the lack of knowledge of the public on, firstly, the dangerous effects of certain antimicrobials (for example, ciprofloxacin, which can cause tendonitis, tendon rupture and aortic dissection) and, secondly, broad microbial resistance and when to seek medical care if the infection is not clearing. Also inappropriate use of over the counter ibuprofen or other nonsteroidal anti inflammatory drugs during winter influenza outbreaks can lead to death, e. g. due to haemorrhagic duodenitis induced by ibuprofen, or the consequences of exceeding the recommended doses of paracetamol by combining doses of the generic product with proprietary flu remedies and Tylex (paracetamol and codeine). In a questionnaire designed to evaluate self medication rates amongst the population of Khartoum, Sudan, 48.1% of respondents reported self medicating with antibiotics within the past 30 days, whereas 43.4% reported self medicating with antimalarials, and 17.5% reported self medicating with both. Overall, the total prevalence of reported self medication with one or both classes of anti infective agents within the past month was 73.9%. Furthermore, according to the associated study, data indicated that self medication "varies significantly with a number of socio economic characteristics" and the "main reason that was indicated for the self medication was financial constraints".

One area of DIY medicine is self administered pharmaceutical drugs that are obtained without a prescription, as in the case of DIY transgender hormone therapy which is common among trans people. Prescription only lifestyle drugs such as those to treat erectile dysfunction, male pattern baldness, and obesity are often purchased online by people who have no diagnosis or prescription. In 2017, the United Kingdom legalized the sale of sildenafil (Viagra) over the counter in part to cut down on the number of men buying it online from unlicensed pharmacies. Self managed abortion with medication is safe and effective, but is illegal in some jurisdictions. Before the current medication had been developed and in places where abortion is illegal, people may resort to unsafe methods of self managed abortion. Another area is the creation of medical devices, such as PPE for protection against COVID 19 and epinephrine injectors. Some people with insulin dependent diabetes have created their own automated insulin delivery systems. One review found that "the quality of glucose control achieved with DIY AID systems is impressively good". With DIY brain stimulation, individuals with depression create their own devices to access an experimental treatment. Other people self administer fecal transplant as a treatment for various diseases.

In a survey of West Bengal, India undergraduate medical school students, 57% reported self medicating. The type of drugs most frequently used for self medication were antibiotics (31%), analgesics (23%), antipyretics (18%), antiulcerics (9%), cough suppressants (8%), multivitamins (6%), and anthelmintics (4%). Another study indicated that 53% of physicians in Karnataka, India reported self administration of antibiotics.

A study of Luo children in western Kenya found that 19% reported engaging in self treatment with either herbal or pharmaceutical medicine. Proportionally, boys were much more likely to self medicate using conventional medicine than herbal medicine as compared with girls, a phenomenon which was theorized to be influenced by their relative earning potential.

Self medication is highly regulated in much of the world and many classes of drugs are available for administration only upon prescription by licensed medical personnel. Safety, social order, commercialization, and religion have historically been among the prevailing factors that lead to such prohibition. People trying to buy pharmaceutical drugs online without a prescription may be the victim of fraud, phishing, or receive counterfeit medication. Selling prescription drugs to people without a valid prescription is illegal in many jurisdictions and can be considered an example of transnational organized crime. In a 2021 article, Jack E. Fincham argues that unlicensed sales of prescription drugs online are a significant public health threat. It is also possible to obtain controlled substances such as amphetamine, benzodiazepines, and Z drugs online without a prescription.