Aspirin, also known as acetylsalicylic acid, is one of the oldest and most extensively studied medicines in the world. Beyond its traditional role as a pain reliever, it is widely recognized today for its blood-thinning properties and use in preventing cardiovascular events in high-risk patients.
What Is Aspirin Used For?
Aspirin serves two very different purposes depending on the dose:
- At regular strength (300mg to 650mg), it relieves pain, reduces fever, and treats inflammation such as headaches, muscle aches, and minor arthritis.
- At low dose (75mg to 100mg), it is prescribed to reduce the risk of heart attack and stroke in people with cardiovascular risk factors, by preventing blood clot formation.
It is also occasionally used in specific inflammatory conditions and after certain cardiac procedures under close medical supervision.
How Does Aspirin Work?
Aspirin irreversibly inhibits the cyclooxygenase (COX) enzyme, reducing the production of prostaglandins that cause pain and inflammation. At low doses, it specifically blocks thromboxane A2 in platelets, preventing platelets from clumping together and forming clots, which is the basis of its cardioprotective use.
General Dosage Information
Dosage depends entirely on the purpose of use and must be guided by a doctor:
- For pain or fever, adults typically take 300mg to 650mg every 4 to 6 hours, not exceeding the maximum stated on the label.
- For heart protection, low-dose aspirin (75mg-100mg) is usually taken once daily, only when prescribed by a physician after assessing cardiovascular risk.
- Aspirin should generally be taken with food to minimize stomach irritation.
Aspirin is not recommended for children and teenagers with viral infections due to the risk of Reye’s syndrome, a rare but serious condition affecting the liver and brain.
Side Effects of Aspirin
- Stomach irritation, heartburn, or indigestion
- Increased bleeding tendency, including easy bruising
- Nausea
- Ringing in the ears (tinnitus) with high doses
- Gastrointestinal bleeding or ulcers with long-term use
Signs of an allergic reaction or overdose, such as difficulty breathing, severe stomach pain, or ringing in the ears, require immediate medical attention.
Who Should Be Cautious?
- People with a history of stomach ulcers or gastrointestinal bleeding
- Those with bleeding disorders or on other blood thinners
- Children and teenagers with fever from viral illness
- People scheduled for surgery, as aspirin increases bleeding risk
- Individuals with asthma sensitive to NSAIDs
Drug Interactions
- Other blood thinners such as warfarin or clopidogrel, increasing bleeding risk
- Other NSAIDs, which can reduce aspirin’s cardioprotective effect and raise stomach bleeding risk
- Certain diabetes medications, as aspirin can enhance their blood sugar-lowering effect
- Methotrexate, where aspirin can increase toxicity
Storage and Precautions
Keep aspirin in a cool, dry place away from children. Never start or stop low-dose aspirin therapy on your own, as sudden discontinuation in cardiovascular patients can increase clotting risk.
Frequently Asked Questions
Should everyone take low-dose aspirin for heart health? No, this decision should be based on an individual risk assessment by a doctor, as it also carries bleeding risks.
Can I give aspirin to my child for fever? No, aspirin is not recommended for children and teenagers due to the risk of Reye’s syndrome; paracetamol or ibuprofen are safer alternatives.
Does aspirin interact with alcohol? Yes, combining the two increases the risk of stomach irritation and bleeding.
Disclaimer
This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Please consult your doctor or pharmacist before using Aspirin or any other medication, especially if you have underlying health conditions or are taking other medicines.