Aspirin-Dipyridamole

What is Aspirin/Dipyridamole?

Aspirin/dipyridamole is a combination medication that contains two active ingredients: aspirin (acetylsalicylic acid), an antiplatelet medication, and dipyridamole, a medication that also affects platelet function through a different mechanism. This fixed-dose combination is marketed under the brand name Aggrenox (known as Asasantin in some countries), with generic versions also available in some markets.

Aspirin/dipyridamole is approved for:

• Reducing the risk of stroke in patients who have had a transient ischemic attack (TIA) or an ischemic stroke due to blood clot formation

This combination is generally not used for other cardiovascular conditions, such as coronary artery disease alone, where other antiplatelet regimens are typically preferred.

Aspirin/dipyridamole is available in the following formulation:

• Oral extended-release capsules combining a fixed dose of aspirin (25 mg) with extended-release dipyridamole (200 mg), taken twice daily

What is the Recommended Dosage of Aspirin/Dipyridamole?

There is no single “correct” dose of this combination for everyone, though it is available as a fixed-dose product with a standard twice-daily regimen for its approved use. The appropriateness of this dose still depends on several individual factors, including:

• The patient’s overall stroke risk and bleeding risk
• The patient’s age
• Kidney and liver function
• Other medications currently being taken
• Whether the patient has other cardiovascular conditions that might call for a different antiplatelet approach

Available Dosage Forms

Aspirin/dipyridamole is available as an extended-release oral capsule, generally taken twice daily (morning and evening).

Important Note on Dosing

Exact dosing instructions are not provided on this page because appropriate use must be determined individually. Patients should:

• Follow the exact dose and schedule prescribed by their licensed medical specialist
• Never adjust the dose on their own
• Swallow the extended-release capsule whole, without crushing or chewing, unless a prescriber or pharmacist specifically advises otherwise
• Ask their prescriber or pharmacist if dosing instructions are unclear

How Aspirin/Dipyridamole Works

This combination reduces clot formation through two different mechanisms:

• Aspirin blocks an enzyme called cyclooxygenase (COX), reducing the ability of platelets (small blood cells involved in clotting) to clump together
• Dipyridamole works through a different pathway, affecting platelet function and also having mild blood vessel-dilating effects; it is thought to enhance the antiplatelet effect of aspirin when used together

In simple terms: combining these two medications provides a more thorough reduction in platelet clumping than aspirin alone, which has been shown to reduce the risk of a second stroke in patients who have already had a TIA or ischemic stroke.

This medication manages clot-related stroke risk; it does not cure the underlying condition that caused the original stroke or TIA, such as atherosclerosis or irregular heart rhythm, and it is often used alongside other treatments, including blood pressure management, statins, and lifestyle changes.

Is a Prescription Required to Buy Aspirin/Dipyridamole Online?

Yes. This combination medication is prescription-only in the United States and most other countries, since dipyridamole (and this specific fixed-dose formulation) requires a prescription even though aspirin alone does not.

Before starting aspirin/dipyridamole, patients should consult a licensed medical specialist, such as:

• A neurologist, particularly one involved in stroke care
• A primary care physician
• A cardiologist, in some cases

Important Safety Warning

Patients should be cautious of websites offering this medication without a prescription. These may include:

• Counterfeit medications with incorrect, unsafe, or no active ingredients
• Products not manufactured under proper quality and safety standards

Always obtain aspirin/dipyridamole from a licensed pharmacy, and only after being evaluated and prescribed by a qualified healthcare provider.

Side Effects of Aspirin/Dipyridamole

Common Side Effects

These are generally mild and may lessen over time as the body adjusts:

• Headache (relatively common when starting this medication, often improving after the first one to two weeks)
• Stomach upset, nausea, or diarrhea
• Dizziness
• Flushing (warmth or redness of the face)

Serious Side Effects

Although uncommon, seek immediate medical attention if any of the following occur:

• Signs of gastrointestinal bleeding, such as black or bloody stools, or vomit that looks like coffee grounds
• Unusual or prolonged bleeding that does not stop with normal pressure
• Chest pain or worsening chest pain, since dipyridamole can, in rare cases, worsen symptoms in patients with significant coronary artery disease
• Signs of an allergic reaction, such as swelling of the face, lips, tongue, or throat, hives, or difficulty breathing

This list is not exhaustive. Patients experiencing any unusual or concerning symptoms, especially persistent or severe headache or chest pain, should contact their prescriber promptly.

Drug Interactions

Aspirin/dipyridamole can interact with a range of substances. Patients should tell their prescriber about all medications and products they use, including:

• Other blood thinners or antiplatelet medications, such as warfarin, clopidogrel, or other anticoagulants, since combined use increases bleeding risk
• NSAIDs (such as ibuprofen or naproxen), which can further increase bleeding risk
• Cholinesterase inhibitors (used for certain conditions such as myasthenia gravis or Alzheimer’s disease), since dipyridamole may reduce their effectiveness
• Blood pressure medications, since dipyridamole may enhance blood pressure-lowering effects
• Methotrexate, since aspirin can increase its levels and toxicity
• Supplements and herbal products, such as fish oil, vitamin E, or ginkgo biloba, which may add to bleeding risk

Patients should provide their licensed medical specialist and pharmacist with a complete and current list of all prescription drugs, OTC medications, vitamins, and herbal supplements before starting this medication.

Safety & Important Considerations

• Coronary artery disease: Dipyridamole can, in some cases, worsen chest pain (angina) in patients with significant underlying coronary artery disease; this should be discussed with a prescriber before starting
• Bleeding risk: The aspirin component increases bleeding risk, including gastrointestinal bleeding
• Liver or kidney disease: May affect how the body processes this combination; caution and possible monitoring are advised
• Pregnancy and breastfeeding: Should only be used during pregnancy or breastfeeding if the potential benefit justifies the potential risk, as determined by a prescriber; aspirin in particular carries specific pregnancy-related considerations, especially later in pregnancy
• Age-related considerations: Older adults may be at higher risk for bleeding complications and may be more sensitive to headache or dizziness when starting treatment
• Surgery or dental procedures: Patients should inform their surgeon or dentist that they are taking this combination medication, as it may need to be paused before certain procedures under medical guidance
• Asthma or nasal polyps: Some patients with these conditions have aspirin sensitivity and may be at risk for allergic-type reactions
• Monitoring requirements: Prescribers may periodically reassess bleeding risk, headache symptoms, and overall cardiovascular and stroke risk status

This medication should only be used for its approved purpose, as determined by a licensed prescriber.

Who This Medication Is For

Aspirin/dipyridamole is generally intended for:

• Adults who have had a transient ischemic attack (TIA) or an ischemic stroke caused by blood clot formation
• Patients who have been evaluated by a licensed prescriber and determined to be appropriate candidates for this specific combination as part of their stroke-prevention plan

This combination is not typically used for coronary artery disease or as a general-purpose antiplatelet medication outside of stroke/TIA prevention. Use should always follow an appropriate clinical evaluation and a specialist’s recommendation.

Who Should Not Take Aspirin/Dipyridamole

This combination may not be appropriate for individuals who:

• Have active, serious bleeding, such as a bleeding ulcer or intracranial hemorrhage
• Have a known allergy or sensitivity to aspirin, dipyridamole, other NSAIDs, or any ingredient in the product
• Have severe coronary artery disease with unstable angina, without specialist guidance
• Are children or teenagers with a current or recent viral illness (due to the aspirin component’s association with Reye’s syndrome)
• Have significant liver or kidney impairment, without specialist guidance

This is not a complete list. A full medical history review by a licensed specialist is necessary to determine if this combination medication is safe and appropriate.

What to Do If You Miss a Dose

• Take the missed dose as soon as remembered, unless it is close to the time of the next scheduled dose, in which case the missed dose should generally be skipped
• Do not double up or take an extra dose to make up for a missed one
• Try to take this medication at the same two times each day (morning and evening) to maintain consistent protection
• Contact a licensed medical specialist if there is any uncertainty about the dosing schedule

Related medications to Aspirin/Dipyridamole

Other antiplatelet approaches sometimes used for stroke prevention include:

• Aspirin alone
• Clopidogrel alone
• Other antiplatelet or anticoagulant medications, depending on the specific cause and type of stroke or TIA

Switching between treatments should only be done in consultation with a licensed medical specialist, who can weigh factors such as stroke cause, bleeding risk, tolerability (particularly headache), and coexisting conditions such as coronary artery disease.

Storage Instructions

• Store at room temperature, generally between 68°F and 77°F (20°C to 25°C), unless otherwise directed on the packaging
• Keep away from excess heat, moisture, and direct light
• Store in the original packaging or container until ready to use
• Keep out of reach of children and pets
• Dispose of expired or unused medication according to local guidelines or pharmacist instructions

Disclaimer:

This page is for educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Patients must consult a licensed neurologist, primary care physician, or other relevant medical specialist before starting, changing, or stopping treatment with aspirin/dipyridamole. Treatment decisions must be based on a full clinical evaluation by a qualified specialist.