Acetylsalicylic acid (aspirin): what is it for and how to take it

Aspirin is a drug that contains acetylsalicylic acid as an active substance, which is a non-steroidal anti-inflammatory, which serves to treat inflammation, relieve pain and lower fever in adults and children.

In addition, in low doses, acetylsalicylic acid is used in adults as an inhibitor of platelet aggregation, to reduce the risk of acute myocardial infarction, prevent stroke, angina pectoris and thrombosis in people who have some risk factors.

Acetylsalicylic acid can also be marketed with the combination of other components, and in different dosages, such as:

  • Prevent aspirin that can be found in doses of 100 to 300 mg;
  • Aspirin Protect containing 100 mg of acetylsalicylic acid;
  • Aspirin C containing 400 mg of acetylsalicylic acid and 240 mg of ascorbic acid, which is vitamin C;
  • CafiAspirin containing 650 mg of acetylsalicylic acid and 65 mg of caffeine;
  • Infantile ASA containing 100 mg of acetylsalicylic acid;
  • Adult ASA containing 500 mg of acetylsalicylic acid.

Acetylsalicylic acid can be purchased at the pharmacy for a price that can vary between 1 and 45 reais, depending on the quantity of pills in the packaging and the laboratory that sells it, but they should only be used after medical recommendation, because as they also act as inhibitors of platelet aggregation, may increase the risk of bleeding.

What is it for

Aspirin is indicated for the relief of mild to moderate pain, such as headache, toothache, sore throat, menstrual pain, muscle pain, joint pain, back pain, arthritis pain and pain relief and fever in case of colds or flu.

In addition, aspirin can also be used as an inhibitor of platelet aggregation, which prevents the formation of thrombi that can cause cardiac complications, so in some cases the cardiologist may prescribe taking 100 to 300 mg of aspirin per day, or every 3 days. See what causes cardiovascular disease and how to prevent it .

How to take

Aspirin can be used as follows:

  • Adults : The recommended dose varies between 400 to 650 mg every 4 to 8 hours, to treat pain, inflammation and fever. To be used as an inhibitor of platelet aggregation, generally, the dose recommended by the doctor is 100 to 300 mg per day, or every 3 days;
  • Children : The recommended dose in children aged 6 months to 1 year is ½ to 1 tablet, in children aged 1 to 3 years, it is 1 tablet, in children aged 4 to 6 years, it is 2 tablets, in children aged 7 to 9 years old, it is 3 tablets and in children from 9 to 12 years old it is 4 tablets. These doses can be repeated at intervals of 4 to 8 hours, if necessary up to a maximum of 3 doses per day. 

Aspirin must be used under medical prescription. In addition, tablets should always be taken preferably after meals, to reduce stomach irritation.

Side effects

Side effects of Aspirin include nausea, abdominal and gastrointestinal pain, poor digestion, redness and itching of the skin, swelling, rhinitis, nasal congestion, dizziness, prolonged bleeding time, bruising and bleeding from the nose, gums or intimate area.


Aspirin is contraindicated in patients with hypersensitivity to acetylsalicylic acid, salicylates or another component of the drug, in people prone to bleeding, asthma attacks induced by the administration of salicylates or other similar substances, stomach or intestinal ulcers, kidney failure , severe liver and heart disease, during treatment with methotrexate at doses greater than 15 mg per week and in the last trimester of pregnancy.

It is necessary to consult the doctor before using Acetylsalicylic Acid in case of pregnancy or suspected pregnancy, hypersensitivity to analgesics, anti-inflammatory or antirheumatic drugs, history of ulcers in the stomach or intestine, history of gastrointestinal bleeding, kidney problems, heart or liver , respiratory diseases like asthma and if you are taking anticoagulants.

Acetylsalicylic Acid-based Medicines

Name Laboratory Name Laboratory
AAS Sanofi EMS Acetylsalicylic Acid tablets EMS
ASSedatil Vitapan Funed Acetylsalicylic Acid Funed
Aceticil Trays Furp-Acetylsalicylic Acid FURP
Acetylsalicylic acid Lafepe Grip-Stop There is
Alidor Aventis Pharma Hypothermal Sanval
Analgesin Teuto Iquego Acetylsalicylic Acid Iquego
Antifebrin Royton Best DM
As-Med Medical Salicetil Brasterápica
Bufferin Bristol-MyersSquibb Salicyl Pipeline
Tops Cimed Salicin Greenpharma
Cordiox Medley Salipirin
Dausmed Usmed Salitil Cifarma
Ecasil Biolab Sanus Somalgin SigmaPharma

Caution: Individuals who are taking aspirin should avoid consuming mango, as it can make the blood more fluid than normal, increasing the risk of bleeding. In addition, this medicine should not be taken with alcohol.

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