Aspirin 81mg Chewable Tablets
Overview
What is this medicine?
How to Use This Medicine
To use this medication correctly, follow your doctor's instructions and read all the information provided. You can take this medication with or without food. If it causes stomach upset, take it with food to help minimize this side effect. Swallow the medication with a full glass of water. You can either chew the medication or swallow it whole.
Storing and Disposing of Your Medication
Store your medication at room temperature in a dry location, avoiding the bathroom. Protect it from heat sources. Keep all medications in a safe place, out of the reach of children and pets. When disposing of unused or expired medication, do not flush it down the toilet or pour it down the drain unless instructed to do so. Instead, consult your pharmacist for guidance on the best disposal method. You may also have access to local drug take-back programs.
Missing a Dose
If you take this medication regularly, take a missed dose as soon as you remember. However, if it's close to the time for your next scheduled dose, skip the missed dose and resume your regular dosing schedule. Do not take two doses at the same time or take extra doses. If you take this medication as needed, follow your doctor's instructions and do not take it more frequently than recommended.
Lifestyle & Tips
- Take exactly as prescribed by your doctor. Do not take more or less, or more often than directed.
- Chew the tablet thoroughly before swallowing for faster absorption, especially in acute situations.
- If you forget a dose, take it as soon as you remember, unless it's almost time for your next dose. Do not double dose.
- Inform your doctor or dentist that you are taking aspirin before any surgery or dental procedures, as it can increase bleeding.
- Avoid or limit alcohol consumption while taking aspirin, as it can increase the risk of stomach bleeding.
- Report any signs of unusual bleeding or bruising to your doctor immediately.
- Do not give aspirin to children or teenagers with flu-like symptoms or chickenpox due to the risk of Reye's Syndrome.
Available Forms & Alternatives
Dosing & Administration
Adult Dosing
Condition-Specific Dosing:
Pediatric Dosing
Dose Adjustments
Renal Impairment:
Hepatic Impairment:
Pharmacology
Mechanism of Action
Pharmacokinetics
Absorption:
Distribution:
Elimination:
Pharmacodynamics
Safety & Warnings
Side Effects
Although rare, some people may experience severe and potentially life-threatening side effects while taking this medication. If you notice any of the following symptoms, contact your doctor or seek immediate medical attention:
Signs of an allergic reaction: rash, hives, itching, red, swollen, blistered, or peeling skin (with or without fever), wheezing, tightness in the chest or throat, difficulty breathing, swallowing, or talking, unusual hoarseness, or swelling of the mouth, face, lips, tongue, or throat.
Signs of bleeding: vomiting or coughing up blood, vomit that resembles coffee grounds, blood in the urine, black, red, or tarry stools, bleeding from the gums, abnormal vaginal bleeding, unexplained bruises or bruises that enlarge, or uncontrolled bleeding.
Signs of kidney problems: inability to urinate, changes in urine output, blood in the urine, or sudden significant weight gain.
Signs of liver problems: dark urine, fatigue, decreased appetite, stomach upset or pain, light-colored stools, vomiting, or yellowing of the skin or eyes.
Signs of high potassium levels: irregular heartbeat, confusion, weakness, lightheadedness, dizziness, feeling faint, numbness or tingling, or shortness of breath.
Signs of acidosis (too much acid in the blood): confusion, rapid breathing, rapid heartbeat, irregular heartbeat, severe stomach pain, upset stomach, vomiting, excessive sleepiness, shortness of breath, or extreme fatigue or weakness.
Sudden weakness on one side of the body, difficulty speaking or thinking, balance changes, drooping on one side of the face, or blurred vision.
Severe dizziness or fainting.
Severe headache.
Ringing in the ears, hearing loss, or other changes in hearing.
Feeling agitated.
Seizures.
Other Possible Side Effects
Like all medications, this drug can cause side effects. Many people may not experience any side effects or only minor ones. If you are bothered by any of the following side effects or if they persist, contact your doctor or seek medical attention:
Stomach pain or heartburn.
Upset stomach or vomiting.
This is not an exhaustive list of possible side effects. If you have questions or concerns about side effects, consult your doctor. You can also report side effects to the FDA at 1-800-332-1088 or online at https://www.fda.gov/medwatch.
Seek Immediate Medical Attention If You Experience:
- Severe stomach pain, heartburn, or indigestion that doesn't go away
- Black, tarry stools or blood in your stools
- Vomiting blood or material that looks like coffee grounds
- Unusual bruising or bleeding (e.g., nosebleeds, bleeding gums, heavy menstrual bleeding)
- Signs of an allergic reaction (hives, rash, swelling of face/lips/tongue/throat, difficulty breathing)
- Ringing in the ears (tinnitus) or hearing loss
- Dizziness, confusion, or severe headache
Before Using This Medicine
It is essential to inform your doctor about the following conditions to ensure safe treatment:
Any allergies you have, including allergies to this medication, its components, or other substances, such as foods or drugs. Describe the allergic reactions you have experienced.
Certain health conditions, including:
+ Asthma
+ Bleeding problems
+ Nose polyps or nose irritation
+ Kidney disease or liver disease
+ Gastrointestinal (GI) bleeding or ulcer disease
If you are taking another medication that contains the same active ingredient as this drug.
If you are taking any other nonsteroidal anti-inflammatory drugs (NSAIDs).
If you are pregnant, planning to become pregnant, or become pregnant while taking this medication. This drug may harm an unborn baby if taken after 20 weeks of pregnancy. Only take this medication after 20 weeks of pregnancy if your doctor has instructed you to do so.
If you are breastfeeding or plan to breastfeed.
Special Considerations for Children:
If the patient is a child, as this medication may not be suitable for all ages.
If your child or teenager has or is recovering from flu symptoms, chickenpox, or other viral infections. The risk of Reye's syndrome, a severe condition, may be increased. Do not give this medication to a child or teenager with a viral infection or who is recovering from one.
Interactions with Other Medications and Health Conditions:
This is not an exhaustive list of all potential interactions. Inform your doctor and pharmacist about all your medications, including prescription and over-the-counter drugs, natural products, and vitamins, as well as any health conditions you have. Verify that it is safe to take this medication with your other medications and health conditions. Do not start, stop, or change the dose of any medication without consulting your doctor.
Precautions & Cautions
To minimize the risk of severe side effects, it is crucial to adhere to the prescribed dosage and not exceed the recommended amount. Additionally, do not take this medication for longer than the duration specified by your doctor.
If you are taking this drug on a regular basis, do not discontinue its use without first consulting the doctor who prescribed it for you. This medication may increase your risk of bleeding, so it is essential to be cautious and avoid injuries. To reduce the risk of bleeding, use a soft toothbrush and an electric razor.
Before consuming alcohol, discuss the potential risks with your doctor. If you smoke, you should also talk to your doctor about the potential interactions between smoking and this medication.
This drug may increase the risk of severe and potentially life-threatening stomach or bowel problems, such as ulcers or bleeding. This risk is higher in older adults and individuals who have a history of stomach or bowel ulcers or bleeding. These complications can occur without warning signs, so it is essential to be aware of the potential risks.
If you are over 60 years old, use this medication with caution, as you may be more susceptible to side effects. Your doctor will closely monitor your condition to minimize the risk of adverse reactions.
Overdose Information
Overdose Symptoms:
- Ringing in the ears (tinnitus)
- Hearing loss
- Nausea, vomiting
- Dizziness, confusion
- Rapid breathing (hyperventilation)
- Fever
- Sweating
- Dehydration
- Seizures (severe overdose)
- Coma (severe overdose)
What to Do:
If you suspect an overdose, seek immediate medical attention. Call 911 or your local emergency number. For poison control, call 1-800-222-1222. Be prepared to provide information about the amount taken and when.
Drug Interactions
Contraindicated Interactions
- Ketorolac (increased risk of GI bleeding)
- Methotrexate (high-dose, increased methotrexate toxicity)
- Live attenuated influenza vaccine (intranasal) in children/adolescents (Reye's Syndrome risk)
Major Interactions
- Anticoagulants (e.g., Warfarin, Heparin, DOACs - increased bleeding risk)
- Other NSAIDs (e.g., Ibuprofen, Naproxen - increased GI bleeding risk, may antagonize antiplatelet effect of aspirin)
- Corticosteroids (increased GI bleeding risk)
- SSRIs/SNRIs (increased bleeding risk)
- Alcohol (increased GI bleeding risk)
- Uricosurics (e.g., Probenecid, Sulfinpyrazone - decreased uricosuric effect)
- Angiotensin-converting enzyme (ACE) inhibitors / Angiotensin receptor blockers (ARBs) / Diuretics (attenuated antihypertensive effect, increased risk of renal impairment)
- Valproic acid (increased valproic acid levels)
Moderate Interactions
- Sulfonylureas (increased hypoglycemic effect)
- Phenytoin (increased phenytoin levels)
- Spironolactone (decreased diuretic effect)
- Antacids (may increase urinary excretion of salicylates, decreasing aspirin levels)
- Herbal supplements (e.g., Ginkgo biloba, Garlic, Ginger - increased bleeding risk)
Minor Interactions
- Not available
Monitoring
Baseline Monitoring
Rationale: To assess baseline hemoglobin, hematocrit, and platelet count due to bleeding risk.
Timing: Prior to initiation, especially if patient has risk factors for bleeding.
Rationale: To assess baseline renal function, as aspirin can impair renal function, especially in susceptible individuals.
Timing: Prior to initiation, especially in elderly or those with pre-existing renal impairment.
Rationale: To assess baseline hepatic function, as aspirin is metabolized by the liver and can cause hepatotoxicity.
Timing: Prior to initiation, especially in patients with pre-existing hepatic impairment.
Rationale: To identify history of ulcers, GI bleeding, or dyspepsia, which are risk factors for GI adverse events.
Timing: Prior to initiation.
Routine Monitoring
Frequency: Regularly, especially during initial therapy and with dose changes.
Target: Absence of unusual bruising, petechiae, melena, hematemesis, epistaxis.
Action Threshold: Any new or worsening signs of bleeding warrant immediate medical evaluation.
Frequency: Periodically, especially in long-term therapy or in patients with risk factors for renal impairment.
Target: Within normal limits or stable from baseline.
Action Threshold: Significant increase in BUN/Creatinine or decrease in eGFR warrants dose adjustment or discontinuation.
Frequency: Regularly.
Target: Absence of dyspepsia, abdominal pain, heartburn.
Action Threshold: Persistent or severe GI symptoms may indicate gastritis or ulceration and require investigation.
Symptom Monitoring
- Unusual bruising or bleeding (e.g., nosebleeds, bleeding gums)
- Black, tarry stools (melena)
- Vomiting blood or coffee-ground like material (hematemesis)
- Severe stomach pain or heartburn
- Signs of allergic reaction (rash, itching, swelling, severe dizziness, trouble breathing)
- Ringing in the ears (tinnitus) or hearing loss (signs of salicylism)
- Nausea, vomiting, dizziness, confusion (signs of overdose)
Special Patient Groups
Pregnancy
Generally avoided in the third trimester due to potential for premature closure of the fetal ductus arteriosus, pulmonary hypertension, and increased maternal/fetal bleeding risk. Low-dose aspirin (81 mg) may be used in specific high-risk pregnancies (e.g., preeclampsia prevention) under strict medical supervision, typically initiated in the first trimester and discontinued before the third.
Trimester-Specific Risks:
Lactation
Aspirin and its metabolite, salicylic acid, are excreted into breast milk. While low-dose aspirin (81 mg) is generally considered compatible with breastfeeding by some experts due to low infant exposure, caution is advised, especially in premature infants or those with underlying conditions. Monitor infant for adverse effects (e.g., bleeding, rash). Avoid chronic high-dose use.
Pediatric Use
Contraindicated in children and teenagers for viral infections (e.g., influenza, chickenpox) due to the risk of Reye's Syndrome, a rare but serious condition causing liver and brain damage. Low-dose aspirin is rarely used in pediatrics, except for specific conditions like Kawasaki disease or certain cardiac conditions, under strict medical supervision.
Geriatric Use
Use with caution in elderly patients due to increased risk of gastrointestinal bleeding, renal impairment, and other adverse effects. Start with the lowest effective dose and monitor closely for adverse reactions, especially GI and renal effects.
Clinical Information
Clinical Pearls
- Aspirin 81mg is primarily used for its antiplatelet effect to prevent cardiovascular events (heart attack, stroke) and is often referred to as 'baby aspirin' or 'low-dose aspirin'.
- Chewable aspirin is preferred in acute myocardial infarction (heart attack) for rapid absorption and antiplatelet effect.
- Always inquire about concurrent use of other NSAIDs (e.g., ibuprofen, naproxen) as they can interfere with aspirin's antiplatelet effect and increase GI bleeding risk.
- Patients should be educated on signs of bleeding (e.g., black stools, easy bruising) and advised to seek immediate medical attention if they occur.
- Proton pump inhibitors (PPIs) or H2 blockers may be co-prescribed in patients at high risk of GI bleeding.
- Counsel patients to avoid aspirin in children and teenagers with viral illnesses due to the risk of Reye's Syndrome.
- Discontinuation of aspirin before surgery should be discussed with the prescribing physician, as the risk of stopping aspirin may outweigh the bleeding risk for some procedures.
Alternative Therapies
- Clopidogrel (Plavix - another antiplatelet agent, often used when aspirin is contraindicated or not tolerated)
- Prasugrel (Effient - antiplatelet, stronger than clopidogrel)
- Ticagrelor (Brilinta - antiplatelet, stronger than clopidogrel)
- NSAIDs (e.g., Ibuprofen, Naproxen - for pain/inflammation, but lack antiplatelet effect of aspirin at low doses)
- Acetaminophen (Tylenol - for pain/fever, no anti-inflammatory or antiplatelet effect)