aspirin chemical reaction

This process yields aspirin and acetic acid, which is considered a byproduct of this reaction. [19], The synthesis of aspirin is classified as an esterification reaction.

[142][145], Adult aspirin tablets are produced in standardised sizes, which vary slightly from country to country, for example 300 mg in Britain and 325 mg (or 5 grains) in the United States. In the 1960s and 1970s, John Vane and others discovered the basic mechanism of aspirin's effects,[9]:226–231 while clinical trials and other studies from the 1960s to the 1980s established aspirin's efficacy as an anti-clotting agent that reduces the risk of clotting diseases. [104], After percutaneous coronary interventions (PCIs), such as the placement of a coronary artery stent, a U.S. Agency for Healthcare Research and Quality guideline recommends that aspirin be taken indefinitely. *All content and webpages on this website were created by High School students. [9]:8–13[12] Hippocrates referred to the use of salicylic tea to reduce fevers around 400 BC, and willow bark preparations were part of the pharmacopoeia of Western medicine in classical antiquity and the Middle Ages. Festival of Sacrifice: The Past and Present of the Islamic Holiday of Eid al-Adha. [121][122] Naproxen has been shown to be as effective as aspirin and less toxic, but due to the limited clinical experience, naproxen is recommended only as a second-line treatment. http://www.livestrong.com/article/39641-bayer-aspirin-tablet-ingredients/#ixzz2Oa6B8KEL, how it affects your body and what it helps, http://www.chem.latech.edu/~deddy/chem104/104Aspirin.htm.

For a long time, only one crystal structure for aspirin was known. Common aspirin side effects may include: upset stomach, heartburn; drowsiness; or mild headache. When high doses are given, it may actually cause fever, owing to the heat released from the electron transport chain, as opposed to the antipyretic action of aspirin seen with lower doses. [163] Using aspirin in combination with clopidogrel or warfarin also increases the risk of upper gastrointestinal bleeding. [110] This effect is particularly beneficial for colorectal cancer (CRC)[71][111][112][113] but must be taken for at least 10–20 years to see this benefit. Aspirin tablets come in different shapes, weight, size, thickness, and hardness which depend upon the dosage amount. Will 5G Impact Our Cell Phone Plans (or Our Health?! It is used to treat pain, reduce fever, and to decrease the aggregation of platelets, such as to decrease blood clotting. [15][16], Aspirin decomposes rapidly in solutions of ammonium acetate or the acetates, carbonates, citrates, or hydroxides of the alkali metals. [160] Use of aspirin during dengue fever is not recommended owing to increased bleeding tendency. In addition, aspirin induces the formation of NO-radicals in the body, which have been shown in mice to have an independent mechanism of reducing inflammation. The chemical equation for the synthesis of aspirin is C7H6O3 + C4H6O3 –> C9H8O4 +C2H4O2, which is a reaction of salicylic acid with acetic anhydride in the presence of phosphoric acid. [72], A meta-analysis through 2019 found that aspirin reduces the risk of cancer of the colorectum, esophagus, and stomach. [9]:267–269, Bayer lost its trademark for Aspirin in the United States in actions taken between 1918 and 1921 because it had failed to use the name for its own product correctly and had for years allowed the use of "Aspirin" by other manufacturers without defending the intellectual property rights. Some of the pain signals do not reach the brain and less pain is felt. [5] Aspirin is a nonsteroidal anti-inflammatory drug (NSAID) and works similarly to other NSAIDs but also suppresses the normal functioning of platelets. Ibuprofen can negate the antiplatelet effect of aspirin used for cardioprotection and stroke prevention.

[155][156] Aspirin is known to displace a number of drugs from protein-binding sites in the blood, including the antidiabetic drugs tolbutamide and chlorpropamide, warfarin, methotrexate, phenytoin, probenecid, valproic acid (as well as interfering with beta oxidation, an important part of valproate metabolism), and other NSAIDs. Aspirin or other over-the-counter analgesics are widely recognized as effective for the treatment of tension headache. [186], Aspirin can cause prolonged bleeding after operations for up to 10 days. [5] In 2017, it was the 42nd most commonly prescribed medication in the United States, with more than 17 million prescriptions. [116], Some conclude the benefits are greater than the risks due to bleeding in those at average risk. [61][62], Aspirin is used in the treatment of a number of conditions, including fever, pain, rheumatic fever, and inflammatory conditions, such as rheumatoid arthritis, pericarditis, and Kawasaki disease. [129], For some people, aspirin does not have as strong an effect on platelets as for others, an effect known as aspirin-resistance or insensitivity. An evidence-based review", "Pathogenesis and management of Kawasaki disease", "Antiplatelet agents for preventing pre-eclampsia and its complications", "Early administration of low-dose aspirin for the prevention of preterm and term preeclampsia: a systematic review and meta-analysis", "Low-Dose Aspirin Use and Cognitive Function in Older Age: A Systematic Review and Meta-analysis", "Aspirin "resistance" and risk of cardiovascular morbidity: systematic review and meta-analysis", "Drug resistance and pseudoresistance: an unintended consequence of enteric coating aspirin", "Laboratory Aspirin Resistance and the Risk of Major Adverse Cardiovascular Events in Patients with Coronary Heart Disease on Confirmed Aspirin Adherence", "Residual platelet reactivity on aspirin therapy and recurrent cardiovascular events — A meta-analysis", "Relationship between adverse events and antiplatelet drug resistance in neurovascular intervention: a meta-analysis", "High on treatment platelet reactivity to aspirin and clopidogrel in ischemic stroke: A systematic review and meta-analysis", "Association of Laboratory-Defined Aspirin Resistance With a Higher Risk of Recurrent Cardiovascular Events: A Systematic Review and Meta-analysis", "A Narrative Review of Aspirin Resistance in VTE Prophylaxis for Orthopaedic Surgery", "Nonsteroidal Anti-inflammatory Drugs: Aspirin", "Effects of aspirin on risks of vascular events and cancer according to bodyweight and dose: analysis of individual patient data from randomised trials", Royal Pharmaceutical Society of Great Britain, "Aspirin for the prevention of cardiovascular disease: U.S. Preventive Services Task Force recommendation statement", "Aspirin: more evidence that low dose is all that is needed", "FDA Warns that Using a Type of Pain and Fever Medication in Second Half of Pregnancy Could Lead to Complications", "NSAIDs may cause rare kidney problems in unborn babies", "Significance of salicylate intolerance in diseases of the lower gastrointestinal tract", "PDR guide to over the counter (OTC) drugs", "Dengue and dengue hemorrhagic fever: information for health care practitioners", "Aspirin use to be banned in under 16-year olds", "Drug drug interactions between antithrombotic medications and the risk of gastrointestinal bleeding", "Interaction of a selective cyclooxygenase-2 inhibitor with aspirin and NO-releasing aspirin in the human gastric mucosa", "General chemistry online: FAQ: Acids and bases: What is the buffer system in buffered aspirin?

[161] People with kidney disease, hyperuricemia, or gout should not take aspirin because it inhibits the kidneys' ability to excrete uric acid, thus may exacerbate these conditions.

Aspirin is Acetylsalicylic Acid. Aspirin helps prevent heart attacks by preventing the accumulation of blood platelet cells, which can cause blood clots. Furthermore, aspirin, while inhibiting the ability of COX-2 to form pro-inflammatory products such as the prostaglandins, converts this enzyme's activity from a prostaglandin-forming cyclooxygenase to a lipoxygenase-like enzyme: aspirin-treated COX-2 metabolizes a variety of polyunsaturated fatty acids to hydroperoxy products which are then further metabolized to specialized proresolving mediators such as the aspirin-triggered lipoxins, aspirin-triggered resolvins, and aspirin-triggered maresins. Aspirin should only be given to animals under the direct supervision of a veterinarian, as adverse effects—including gastrointestinal issues—are common. In 2012, salicylic acid was found to activate AMP-activated protein kinase, which has been suggested as a possible explanation for some of the effects of both salicylic acid and aspirin. This method is commonly employed in undergraduate teaching labs. [125], Low-dose aspirin supplementation has moderate benefits when used for prevention of pre-eclampsia.

In one study, 30 of 6499 people having elective surgery required reoperations to control bleeding.

Meta-analysis and systematic reviews have concluded that laboratory confirmed aspirin resistance confers increased rates of poorer outcomes in cardiovascular and neurovascular diseases. In acute poisoning, a single large dose is taken; in chronic poisoning, higher than normal doses are taken over a period of time. [141] However, unlike cardiovascular and neurovascular diseases, there is no confirmation on the incidence rates of aspirin resistance in orthopaedic surgery, nor is there confirmation on the clinical implications. The reason of this widespread use is the evidence of its proven effectiveness in major systemic venous thrombotic disorders, and it has been assumed that may be similarly beneficial in various types of retinal vein occlusion. [43][44] These acetylation reactions may explain many hitherto unexplained effects of aspirin. [5] It may also decrease the risk of certain types of cancer, particularly colorectal cancer. Once aspirin is synthesized, it needs to be purified, and an estimation of its purity should be performed. This reduced leukocyte adhesion is an important step in the immune response to infection; however, evidence is insufficient to show aspirin helps to fight infection. Acidosis increases the volume of distribution because of enhancement of tissue penetration of salicylates. [103] Some authors have suggested testing regimens to identify people who are resistant to aspirin. [54] Aspirin for some patients with chronic kidney disease and some children with congestive heart failure was contraindicated. [93][72], In those with no previous history of heart disease, aspirin decreases the risk of a non-fatal myocardial infarction but increases the risk of bleeding and does not change the overall risk of death. Buffering agents are intended to work by preventing the aspirin from concentrating in the walls of the stomach, although the benefits of buffered aspirin are disputed. Aspirin's ability to suppress the production of prostaglandins and thromboxanes is due to its irreversible inactivation of the cyclooxygenase (COX; officially known as prostaglandin-endoperoxide synthase, PTGS) enzyme required for prostaglandin and thromboxane synthesis. Fact Check: What Power Does the President Really Have Over State Governors? [153][154] They recommend avoiding NSAIDs in pregnant women at 20 weeks or later in pregnancy. [154], Aspirin should not be taken by people who are allergic to ibuprofen or naproxen,[155][156] or who have salicylate intolerance[157][158] or a more generalized drug intolerance to NSAIDs, and caution should be exercised in those with asthma or NSAID-precipitated bronchospasm. Owing to its effect on the stomach lining, manufacturers recommend people with peptic ulcers, mild diabetes, or gastritis seek medical advice before using aspirin. However, when the aspirin was taken alone, it did not cause angioedema in these people; the aspirin had been taken in combination with another NSAID-induced drug when angioedema appeared. [148], March 2009 recommendations from the USPSTF on the use of aspirin for the primary prevention of coronary heart disease encourage men aged 45–79 and women aged 55–79 to use aspirin when the potential benefit of a reduction in MI for men or stroke for women outweighs the potential harm of an increase in gastrointestinal hemorrhage.

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