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Antibiotics are a group of natural organic matter (natural) or semi-synthetic origin, possess the ability to destroy or slow the growth of bacteria, fungi and tumors. At the present time there are thousands of antibiotics, but only a small fraction of them are relatively safe for use in the treatment of diseases in humans
What are antibiotics?
Antibiotics are chemicals produced by living organisms (or received on the basis of natural substances), have the ability to suppress reproduction or destroy the cells of different microbes and tumors. History of discovery of antibiotics
Opening of antibiotics, without exaggeration, be called one of the greatest medical achievements of the last century. Amoxicillin antibiotic of antibiotics is the English scientist Fleming, who in 1929 described the bactericidal action of penicillin fungus colonies on the colonies of bacteria proliferating in the vicinity of the fungus. Like many great discoveries in medicine, the discovery of antibiotics was made by accident. It turns out that the scientist Fleming not very fond of cleanliness, and therefore often the tubes on the shelves in his lab were overgrown with mold. Once, after a short absence, Fleming noticed that the overgrown colony of mold penicillin to completely suppress the growth of neighboring colonies of bacteria (both colonies grew in one tube). Here we must pay tribute to the genius of the great scientist who was able to see this remarkable fact, which served as the basis for the assumption that the fungi have won the bacteria with a special substance harmless to themselves and to the deadly bacteria. This substance is a natural antibiotic – chemical weapons microcosm.
Indeed, the development of antibiotics is one of the most sophisticated methods of competition between organisms in nature.
This substance was named penicillin (from the name of the species of fungus from the colonies which was received this antibiotic). During the war, this wonderful medicine has saved thousands of patients who were doomed to death from purulent complications.
But this was only the beginning of the era of antibiotics. After the war, research in this area continued and the followers of Fleming discovered a multitude of substances with properties of penicillin. It turned out that in addition to fungal substances and similar properties are developed, and some bacteria, plants, animals. Parallel studies in the field of microbiology, biochemistry and pharmacology, finally, led to the invention of a number of antibiotics available for treatment of a wide variety of infections caused by bacteria. It was found that some antibiotics can be used to treat fungal infections or for destroying malignant tumors.
How do antibiotics
The term “antibiotic” comes from the Greek words anti, meaning against, and bios – life, and literally translates as “the cure for life”. Despite this saving antibiotics and will save millions of lives. So what is the secret of antibiotics, their mechanism of action?
The most important point in understanding the phenomenon of antibiotics is to define the horizon of their action. As we already mentioned above, antibiotics destroy or impede the development of bacteria, fungi or cell tumors, antibiotic resistance, antibiotics active against organisms composed of cells. And vice versa: antibiotics completely ineffective against viruses that are known to belong to the sub-cellular microorganisms.
The mechanism of action (principle of) antibiotics mainly lies in their ability to inhibit growth and destroy the cells of bacteria, fungi and tumors. Different antibiotics have different mechanism of action. Below we consider the principle of the major groups of antibiotics:
* Antibiotics that destroy the cell wall. A large number of bacteria protected from the outside solid frame of the complex organic compounds. The destruction of this framework is equivalent to the death of bacteria. It is this property (destruction of the cell wall) and has the above-mentioned antibiotic penicillin and all its derivatives. In addition to antibiotics of penicillin group had similar effects natural antibiotic, and avelox antibiotic. The molecules of these antibiotics block specific enzymes of bacteria that perform the role of “matching” outside the framework of bacteria. Without this enzyme the bacteria are deprived of opportunities to grow and die.
* Antibiotics that block protein synthesis. These antibiotics penetrate into bacterial cells and are associated with structures, synthesizing bacterial proteins, and blocking the biochemical processes occurring in bacterial cells. Paralyzed bacteria lose their ability to multiply and grow, which is enough to win some infections.
* Antibiotics, dissolving the cell membrane. As we know the cell membrane of some bacteria and fungi is composed of fats, which dissolve certain substances. This is the mechanism of action of antifungal antibiotics from the group nystatin, levorin, amphotericin.
Other types of antibiotics act by blocking the synthesis of nucleic acids (RNA, DNA), or paralyze certain biochemical processes in bacteria.
Some antibiotics are capable of destroying organisms, worms, and other tumor cells are able to win.
Always Do antibiotics destroy bacteria?
The global effect of antibiotics on bacteria or other microorganisms can be expressed in two forms: bactericidal and cipro antibiotic effects.
Bactericidal effect involves the destruction of bacteria. In normal doses this effect have new antibiotic targets all antibiotics that block the growth of the cell wall (penicillin, keflex antibiotic). In relation to fungi such effects have antibiotics such as nystatin or levorin (fungicidal effect).
Bacteriostatic effect is expected to slow growth and reproduction of bacteria under the action of antibiotics. Bacteriostatic action of antibiotics have, blocking the synthesis of proteins and nucleic acids (tetracyclines, oral lactam antibiotic pdf, bactrim antibiotic, antibiotic adverse reactions, ceftin antibiotic, levaquin antibiotic, doxycycline antibiotic, antibiotic resistant bacteria pictures, augmentin antibiotic, omnicef antibiotic, septra antibiotic, antibiotic doses for cats and dogs, antibiotic ointment , biaxin antibiotic, pack antibiotic, honey antibiotic, antibiotic for dog, herbal antibiotic, antibiotic ampicillin, cephalexin antibiotic, antibiotic side effects, antibiotic eye drops , antibiotic home remedy, flagyl antibiotic, genital warts triple antibiotic, medications that have antibiotic properties without a prescription, triple antibiotic ointment, antibiotic treatments for cocci bacteria in dogs, cat antibiotic, antibiotic and its uses, antibiotic resistant viruses, antibiotic for boils, using antibiotic eardrops, macrolide antibiotic, antibiotic ointments, sinus infection antibiotic of choice, antibiotic intra abdominal sepsis, no prescription antibiotic, non prescription antibiotic, cipro antibiotic side effects, autism and antibiotic vaccinations, how to use garlic tablets as natural antibiotic, antibiotic levaquin, rocephin antibiotic, best antibiotic for uti, smz tmp antibiotic, triple antibiotic genital warts, dog reaction antibiotic, chemotherapy antibiotic microbiology, using garlic tablets as natural antibiotic, rifamycin antibiotic, antibiotic lawsuits, baytril antibiotic, cook spectrum antibiotic impregnated drain, antibiotic resistant salmonella, rash after taking antibiotic, antibiotic production, oral antibiotic dog eye infection ,etc.). The slowdown in growth and reproduction of bacteria is enough to win over many infections. In large doses bacteriostatic effect of these antibiotics can develop into a microbicide.
One of the main characteristics of antibiotics, which determines the possibility of their use in the treatment of disease in humans is their selectivity. Under the ability to understand the selectivity of antibiotics cause the death of some living organisms and not to act on others. Antibiotic Fleming (penicillin) had a selective destructive action in relation to the bacteria and was friendly to fungi that it was working out.
Pot to antibiotics used to treat infections in people, study their effects on the human body. In this sense, the most selective (and the least risk to humans) have a group of antibiotics antibiotic intestinal damage and cephalosporin, acting on components of bacteria which have no analogues in the human body. On the other hand antibiotics that suppress the synthesis of proteins or nucleic acids may have a similar effect on the human body, as these processes (the synthesis of proteins and nucleic acids) occur in our body. Low selectivity significantly limits the application of relevant groups of antibiotics in medicine.
Another important characteristic is the spectrum of antibiotics. The spectrum of antibiotic determines the breadth of its impact on different populations of bacteria. Structure and composition of different bacteria are very diverse, and because some types of bacteria are completely insensitive to certain antibiotics, active against other bacteria. The more bacteria are sensitive to one particular antibiotic, the wider the range of its actions.
There are antibiotics broad and narrow spectrum and the other is used for certain purposes, as the width of the spectrum, as the case may be both positive and negative qualities of the antibiotic.
Resistance to antibiotics
The appearance and use of antibiotics has had a tremendous influence on microorganisms. In a sense, antibiotics have become an additional factor in the selection of habitats of microbes, and, as expected, the microbes have learned to adapt to antibiotic for strep throat. This phenomenon is known as antibiotic resistance (resistance) of microbes against antibiotics. Currently, the problem of antibiotic resistance is a major problem of antibiotic use. As it turned out, the use of antibiotics leads to the formation of microbial insensitive to them, and therefore more aggressive and dangerous than their predecessors. Mechanisms of antibiotic resistance are different: in some cases, the bacteria change their structure, in other cases, begin to produce substances binding antibiotics.
Diseases caused by microbes with antibiotic resistance, more severe and less responsive to treatment. Generally in the treatment of these diseases can be used only new and powerful antibiotics or synthetic drugs that are not yet known microbes.
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The risk of most malformations is not increased with antibiotic treatment during pregnancy.
A recent study, the risk of most malformations is not increased with antibiotic treatment during pregnancy. But there are exceptions. Doxycycline rat respiratory.
Doxycycline for dogs.The researchers analyzed data from 13 000 women who had a child with one of the 30 severe malformations, and almost 5000 – gave birth to healthy children. Doxycycline hyc cap 100mg.How long does doxycycline take to treat severe acne. In the group of women who gave birth to children with defects, about 14% received antibiotics for a month before pregnancy and during the first trimester – a critical period for fetal development. But in the group of mothers of healthy children per se was 13%. Doxycycline brand name.
Doxycycl hyc 100mg malaria.The study found that antibiotics such as penicillin, cephalosporins, quinolones, and other common antimicrobials for admission during pregnancy did not increase the risk of 30 Consideration malformations. Doxycycl hyc 100mg cap mutual for acne.
Doxycycl hyc uses.However, scientists have identified two groups of antibiotics actually increase the risk of defects larger than the rest. Doxycycline photo dermatitis. This nitrofuran derivatives, in particular, nitrofurantoin, and sulfonamides – drugs that are often prescribed for urinary tract infections. Apo doxycycline. The first group is connected with the development of 4 heavy defects, the second – six, while other groups of antibiotics had a relationship with 1 or 2 kinds of vices. Doxycycline 20 mg.
Doxycycline vibramycin. This study is the first time established a link between the treatment of urinary infections in pregnant women to certain antibiotics and the risk of malformations in newborns. Doxycycline genrx prescribed for.
Doxycycline dosage chicken.According to researchers, the result of their work should be weighed by doctors risk of infection and the risk of antibiotic treatment in the appointment of their pregnancy at an early period, rather than a complete cessation of their use during pregnancy. Does doxycycline cause vaginal bleeding.
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New antibiotics have been discovered Alexander Fleming, who in 1929 noticed that the staphylococcus colonies are destroyed, if next to them are growing colonies of certain species of fungi. It was discovered penicillin. But in its pure form it could allocate only in 1940. Antibiotics – a matter of microbial, animal or vegetable origin, selectively inhibit the viability of microorganisms. The term “antibiotics” was proposed by S. Waxman in 1942.
Antibiotics are used in medical practice, are produced by radiant fungi (internal hordeolum doxycycline), fungi and some bacteria. This group of drugs also include synthetic analogs of natural antibiotics.
There are antibiotics with antibacterial, antifungal and doxycycline for uti infection activity. Antibiotics affect the microorganisms or suppressing their reproduction (doxycycline rosacea effect), or causing their death (bactericidal effect).
Antibiotics are antimicrobial action on degree of exposure to certain microorganisms are significantly different from each other: some impact mainly on gram-positive bacteria (bacteria that are sufficiently dense shell, so keep the color in the staining of Gram; these include
what is doxycycline used for, streptococci, staphylococci, causative agents tetanus, botulism, etc.), others in Gram-negative (bacteria that are less dense shell, so do not hold the color of Gram staining, these include doxycycline rosacea, gonococcus, dysenteric bacillus, salmonella, etc.), bacteria, others have a broad spectrum actions, including gram-positive and Gram-negative bacteria, what is doxycycline used for (small bacteria, parasites inside the cells of human tissue), chlamydia (large viruses) and several other infectious agents.
By broad-spectrum antibiotics are tetracyclines, levomitsetin, streptomycin, neomycin, monomitsin, kanamycin, ampicillin, imipenem, cephalosporins, rifampicin.
Tetracyclines
Tetracyclines (tetracycline, doxycycline, metatsiklina hydrochloride, vibramitsin and others) have a broad spectrum of activity, they are active against Gram-positive and gram-positive cocci (spherical bacteria), agents of bacillary dysentery, typhoid fever, spirochetes (bacteria elongated and spirally curved), rickettsia , agents of especially dangerous infections (plague, tularemia, cholera), trachoma, and some protozoa (eg, agents of amoebic dysentery). At Proteus, Pseudomonas aeruginosa, the true pathogenic fungi, viruses and tetracyclines do not apply.
The mechanism of action of tetracyclines is related to inhibition of intracellular protein synthesis of bacteria. In addition, tetracyclines bind some trace elements that make up the enzymes of bacteria, which also suspends the vital activity of bacteria. Tetracycline is mainly bacteriostatic doxycycline fatigue particularly effective against multiplying bacteria.
Tetracyclines are absorbed from the stomach and small intestine, not completely, but sufficiently necessary in order to provide the necessary concentration, derived from the urine and bile.
Tetracyclines may have a number of side effects. For example, tetracyclines have an irritant effect: when administered – the mucous membrane of the gastrointestinal tract, resulting in sometimes nausea, vomiting, diarrhea, etc., with intramuscular injection – on the surrounding tissues (the pain after the injection, the inflammation of surrounding veins and t . etc.). Tetracycline can have toxic effects on the liver and cause dysbacterioses, suppressing the normal intestinal microflora.
Cephalosporins
The first group of antibiotic cephalosporins (doxycycline monohydrate pdf) was isolated from the same fungus, was then a large number of semi-synthetic cephalosporin antibiotics. Effective tsefalosporiny bactericidal, ie kill infectious agents.
Tsefalosporiny divided into preparations for oral administration (cephalexin, Cefaclor) and preparations for parenteral (bypassing the gastrointestinal tract) administration (cephalothin, doxycycline for sinus).
Tsefalosporinov disadvantage is that they have a significant percentage of patients cause allergic reactions. Of the non-allergic reactions may damage the kidneys and reduce the number of white blood cells (and hence low immunity). In addition, doxycycline mono have a local irritant effect, so when intramuscular injection may have pain and swelling, and if swallowed – nausea, vomiting and decreased appetite.
Tooth abscess antibiotics
Abscess – demarcation tooth abscess in various tissues and organs. Abscess must be distinguished from liver abscess (diffuse purulent inflammation of the tissues) and tooth abscess antibiotics (accumulation of pus in body cavities and hollow organs).
The causative of this form of purulent process is often staphylococcus (as the sole source or in association with streptococci, Escherichia coli, Proteus and other types of the tooth abscess).
Ways of penetration of microbes and the development of abscesses are numerous: skin damage (liver abscess), the spread of infection from a primary focus (furuncle), suppuration tooth abscess antibiotics (limited tooth abscess pain relief accumulation of blood), cysts (limited capsule fluid accumulation), the introduction of the soft tissues of concentrated solutions of drugs skin abscess metastasis of purulent infection, and more.
Feature is the presence of abscess tooth abscess pain relief membrane – the inner wall of purulent cavity created by the tissues surrounding the inflammatory focus (a manifestation of the normal protective reaction of the organism). Tooth abscess antibiotics membrane lined by granulation tissue, it demarcates tooth abscess process and produces fluid.
Depending on the localization distinguish surface (in the subcutaneous tissue) and deep (in the organs, tissues and cavities) abscesses. Superficial abscesses are characterized by classical symptoms of acute inflammation: hyperemia of the skin, swelling, local tenderness, local increase in body temperature and dysfunction. In liver abscess pus often distributed tooth abscess antibiotics cracks far from the initial appearance (tooth abscess pain relief, the medial surface of the thigh), forming a wandering abscess (wandering abscess).
Common clinical manifestations of abscess typical inflammatory processes of any location: fever of skin abscess to 41 ° (in severe cases), malaise, weakness, loss of appetite, headache. The extent of these changes depends on the severity of the pathological process. The clinical picture abscesses of various organs have specific features due to the localization process. The outcome of abscess may be a spontaneous opening with a break out (subcutaneous tissue abscess, mastitis, tooth abscess antibiotics, etc.); breakthrough and emptying into the closed cavity (peritoneal, pleural, in the joint cavity, etc.), a breakthrough in the lumen of bodies, communicating with the external environment (intestine, stomach, bladder, bronchi, etc.). Emptied abscess cavity under favorable conditions, decreases in size, decreases scarring and exposed. Incomplete emptying the abscess cavity and poor drainage of the process can proceed in the formation of a chronic fistula. Breakthrough of pus in a closed cavity leads to the development of these purulent processes (peritonitis, pleurisy, liver abscess, meningitis, arthritis, etc.).
Treatment abscess
An essential factor in the successful fight against various abscesses is their early diagnosis and treatment. This is possible only if a timely appeal to the trained professionals working in multidisciplinary clinics with modern diagnostic laboratory.
The diagnosis of an abscess is an indication for surgical intervention, whose goal (regardless of the localization process) is the opening of purulent cavity, its emptying and drainage. Treatment of small superficial abscesses subcutaneous tissue performed in outpatient settings.
In some abscesses, such as liver, lung, and sometimes spend puncture with aspiration of pus and subsequent introduction into the cavity of an abscess antibiotics, enzyme preparations.
Antibiotics are prescribed taking into account the sensitivity to them liver abscess. Use funds from a specific therapy – staphylococcal tooth abscess, specific gamma globulin. When abscesses that developed against the background of diabetes mellitus, must be corrected metabolic disorders.
In later performed the operation, inadequate drainage of abscess possible transition process in the chronic form and generalization of infection.
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Doxycycline hydrochloride is used in adults and children older than 8 years in diseases caused by microorganisms sensitive to it (acute and 100 mg doxycycline bronchitis, pneumonia, pleurisy, and urinary tract infections, including gonorrhea).
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In subsequent days the daily dose – 0,1 g. In severe infections the daily dose in the 1 st and subsequent days – 0,2 g.
Children from 8 to 12 years shall be appointed by the rate of 4 mg / (kg day) in 1-day, 2 mg / kg on subsequent days (4 mg / kg if severe infection). Children older than 12 years: the same dose as adults.
Treatment of patients with gonorrhea conducted under the scheme.
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Buy doxycycline overnight mail drug is not indicated for children under 8 years old. In the following days, the daily dose – 0,1 g. In severe infections the daily dose of 1 and subsequent days – 0 2 g. Children from 8 to 12 years: the rate of 4 mg / kg / day in 1-day, 2 mg / kg on subsequent days (4 mg / kg if severe infection). Children older than 12 years: the same dose as adults. In severe infections may be in / at the introduction of the drug. Solution prepared immediately before administration, throwing the contents of 1.2 ampoules (0,1-0,2 g) in isotonic sodium chloride or 5% glucose solution. The concentration of drug in solution for infusion should not exceed 1 mg / ml. The duration of infusion in a dose-dependent (0,1 or 0,2 g) is 1-2 h with the rate of introduction of 60-80 drops per minute. During the infusion solutions should be protected from light (sunlight and artificial). The duration of treatment with a / in the introduction of 3-5 days, with good endurance – 7 days followed by a transition (if necessary) to receive the drug inside in the form of capsules or tablets. When you receive the drug inside depending on the course and severity of the disease course of treatment is 7.10 days. In the treatment of gonorrhea doxycycline appoint one of the following schemes: patients with acute uncomplicated 100 mg doxycycline – in a course dose of 0.5 g (1 st reception – 0,3 g, the next two hours – to 0,1 g at intervals of 6 h), with complicated forms of exchange rate of gonorrhea antibiotic dose (0,8-0,9 g) distribute in 6 – 7 injections (0.3 g per 1-th reception of 0,1 g at intervals of 6 h for 5 – 6 follow-up). In the primary and secondary syphilis prescribed 300 mg daily, the minimum duration of treatment – 10 days. Buy doxycycline offshore 0,05 g and 0,1 g; tab. to 0,1 g; lyophilized. 20 mg doxycycline (or porous mass) in ampoules of 0,1 g; suspension (syrup), ODS. in 1 ml of 0,01 g of doxycycline, in vial. to 20 ml.
