Aspirin

Pain and Fever Relief

Aspirin is frequently used to provide temporary relief from various types of mild to moderate pain, including:

• Headaches
• Muscle aches
• Toothaches
• Menstrual cramps
• Pain and fever associated with the common cold

Inflammatory Conditions

Aspirin may be used to reduce pain and swelling caused by long-term inflammatory conditions, such as:

• Rheumatoid arthritis
• Osteoarthritis
• Systemic lupus erythematosus
• Other rheumatic conditions

Cardiovascular Protection

Healthcare providers may recommend aspirin for its ability to prevent blood clots. This use is typically intended for individuals who have a high risk of cardiovascular events, including those who have:

• A history of heart attack or stroke
• Chronic chest pain (angina)
• Undergone certain heart procedures, such as bypass surgery or coronary angioplasty

In some cases, aspirin is used during a suspected heart attack to help limit damage to the heart muscle.

Pain and Inflammation Relief

Aspirin belongs to a class of medications known as salicylates and nonsteroidal anti-inflammatory drugs (NSAIDs). It works by inhibiting the production of prostaglandins, which are natural chemicals in the body that signal pain and cause inflammation and fever.

Blood Clot Prevention

Aspirin also affects how the blood clots. It prevents platelets—small cells in the blood—from sticking together to form a clot. It does this by blocking a specific enzyme that helps produce a substance called thromboxane A2, which normally triggers platelet clumping. By keeping the blood flowing more freely, aspirin can help reduce the risk of serious cardiovascular events like heart attacks or strokes.

Common Side Effects

Some people may experience mild side effects while taking aspirin. These often include:

• Nausea or vomiting
• Stomach pain or indigestion
• Heartburn

Serious Side Effects

Aspirin can cause serious side effects that require immediate medical care. Contact a healthcare provider or seek emergency help if you notice:

• Signs of an allergic reaction, including hives, rash, or swelling of the eyes, face, lips, tongue, or throat
• Wheezing or difficulty breathing
• Ringing in the ears or sudden hearing loss
• Vomit that is bright red or looks like coffee grounds
• Stools that are black, tarry, or contain bright red blood
• Unusual or heavy bleeding, such as frequent nosebleeds or cuts that do not stop bleeding
• Fast heartbeat or cold, clammy skin

Reye's Syndrome

Children and teenagers who have or are recovering from chickenpox or flu-like symptoms should not use aspirin. If changes in behavior with nausea and vomiting occur, a healthcare provider should be consulted immediately. These symptoms can be early signs of Reye's syndrome, a rare but serious illness that can be fatal.

Bleeding Risks

Aspirin may cause severe stomach bleeding. The risk is higher for individuals who:

• Are age 60 or older.
• Have had stomach ulcers or bleeding problems.
• Take a blood thinning (anticoagulant) or steroid medicine.
• Take other drugs containing prescription or nonprescription NSAIDs, such as ibuprofen or naproxen.
• Consume three or more alcoholic drinks every day while using aspirin.
• Take more than the recommended dose or use it for a longer time than directed.

Allergic Reactions

Aspirin may cause a severe allergic reaction, especially in people allergic to other nonsteroidal anti-inflammatory drugs (NSAIDs). Symptoms may include:

• Hives or skin reddening.
• Facial swelling.
• Asthma (wheezing).
• Shock.

Individuals with a history of asthma or nasal polyps may be at a higher risk for sensitive reactions to aspirin.

Pregnancy and Breastfeeding

Aspirin should not be used during the last three months of pregnancy unless specifically directed by a doctor. Use during this time may cause problems in the unborn child or complications during delivery. It is also important to consult a healthcare professional before use if breastfeeding, as aspirin can pass into breast milk.

Other Medical Conditions

Aspirin use may require caution or medical supervision for individuals with certain health history, including:

• Kidney or liver disease.
• Gout.
• High blood pressure or heart disease.
• A history of asthma.

Because aspirin affects blood clotting, it may need to be stopped temporarily before scheduled surgery or dental procedures to prevent excessive bleeding.

Pregnancy

Aspirin is typically avoided during pregnancy unless specifically recommended by a doctor. Using aspirin, particularly at full doses, during the second half of pregnancy (starting around 20 weeks) can cause rare but serious kidney problems in the unborn baby, which may lead to low levels of amniotic fluid. If taken near the time of delivery, aspirin may also increase the risk of bleeding for both the parent and the newborn.

In certain medical situations, a healthcare provider may prescribe a daily low-dose aspirin (81 mg) to help prevent complications like preeclampsia. Because of the potential risks, it is essential to consult a clinician before taking any amount of aspirin while pregnant.

Breastfeeding

Aspirin can pass into breast milk and may pose risks to a nursing infant. Although the risk of Reye's syndrome is most significant when children take aspirin directly, healthcare providers often recommend caution or alternative medications for those who are breastfeeding. Discussing the use of aspirin with a healthcare professional can help determine the safest approach for managing pain or other conditions while nursing.

Oral Forms

Aspirin is most commonly taken by mouth. Available oral forms include:

• Regular tablets: Standard tablets that dissolve in the stomach.
• Chewable tablets: Often used for quick absorption or by individuals who have difficulty swallowing pills.
• Enteric-coated tablets: Also known as delayed-release tablets, these have a special coating to prevent the medication from dissolving until it reaches the small intestine, which may help reduce stomach irritation.
• Buffered tablets: These contain antacids to help neutralize stomach acid.
• Extended-release capsules and tablets: Designed to release the medication slowly over a longer period.
• Liquid-filled capsules: Softgels containing liquid medication.
• Powders: Oral powders that can be dissolved in water or placed directly on the tongue.

Rectal Forms

For individuals who cannot take medication by mouth due to nausea, vomiting, or other medical reasons, aspirin is available as a rectal suppository.

FDA Approval and Use

Aspirin is regulated by the FDA as an over-the-counter (OTC) medication. It is approved for the temporary relief of minor aches and pains associated with conditions such as headaches, muscle aches, toothaches, and the common cold, as well as for reducing fever.

Cardiovascular Indications

The FDA has approved the use of aspirin for secondary prevention in individuals who have already suffered a heart attack, a stroke, or other cardiovascular events. In these cases, the medication is used to reduce the risk of a repeat event.

However, the FDA has determined that the evidence does not support the use of aspirin for the primary prevention of heart attacks or strokes in people who have not yet developed cardiovascular disease. For these individuals, the risk of serious side effects, such as internal bleeding, may outweigh the potential benefits.

Safety Labeling and Warnings

The FDA requires specific warnings on aspirin packaging, including:

• Reye's Syndrome: A warning that children and teenagers who have or are recovering from chickenpox or flu-like symptoms should not use aspirin due to the risk of Reye's syndrome, a rare but serious illness.
• Stomach Bleeding: A warning regarding the risk of severe stomach bleeding, which is higher in people over age 60, those with a history of stomach ulcers, or those taking blood thinners or steroid medications.

How Aspirin Works as a Blood Thinner

Aspirin is classified as an antiplatelet medication. It works by interfering with the blood's natural clotting process. When a blood vessel is injured, tiny blood cells called platelets clump together to form a plug that stops the bleeding. Aspirin prevents these platelets from sticking together, which makes it less likely for a clot to form inside an artery.

Uses for Preventing Clots

By keeping blood flowing more smoothly, aspirin is often used to manage conditions related to blood clots. Healthcare providers may recommend it for:

• Reducing the risk of a heart attack or stroke in individuals who have already had one.
• Preventing blood clots in people with certain types of heart disease or those who have had procedures like bypass surgery or stent placement.
• Lowering the risk of a first heart attack or stroke in people who are at high risk due to other health factors.

Risks of Blood Thinning

Because aspirin reduces the blood's ability to clot, it increases the risk of bleeding. This can lead to various complications, including:

• Easier bruising or minor cuts that take longer to stop bleeding.
• Gastrointestinal bleeding, which can cause stomach pain, bright red blood in stools, or black, tarry stools.
• An increased risk of bleeding in the brain, known as a hemorrhagic stroke.

Daily aspirin therapy should only be started under the direction of a healthcare professional. They will determine if the benefits of preventing a heart attack or stroke outweigh the potential risks of serious bleeding based on an individual's medical history.