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Dipyridamole, containing the active ingredient Dipyridamole, is vital for preventing blood clots post-heart valve surgery and in stroke prevention therapy, FDA-approved as part of Aggrenox. Available in tablet form with strengths ranging from 25mg to 75mg, it’s taken orally, usually with multiple doses daily. While generally well-tolerated, side effects like headache and dizziness may occur. Patients should adhere to prescribed dosages, store the medication properly, and inform healthcare providers of any missed doses or potential overdoses. With cautionary measures, Dipyridamole effectively manages conditions where clot formation poses risks, aiding cardiovascular health and stroke prevention strategies.

Product Overview

Dipyridamole, a medication containing the active ingredient Dipyridamole, is commonly prescribed to prevent blood clots post-heart valve surgery. It is also FDA-approved for use in stroke prevention as part of Aggrenox combination therapy. This medication is crucial in managing conditions where blood clot formation poses significant risks, such as following cardiac procedures or in individuals at high risk of stroke due to underlying cardiovascular diseases. Dipyridamole works by inhibiting adenosine breakdown, promoting vasodilation, and reducing the risk of clot formation.

Dipyridamole is available in various strengths, including tablets containing 25mg, 50mg, and 75mg. The prescribed dosage varies depending on the patient’s health condition, with typical daily regimens involving multiple doses. Patients should take Dipyridamole as their healthcare provider directs, with or without food, and swallow the tablets whole. Adhering to prescribed dosages and schedules is essential for optimal effectiveness.

Dipyridamole is generally well-tolerated, but like any medication, it may cause side effects. Common adverse reactions include headache, dizziness, nausea, and hypotension. Patients should be cautious while taking Dipyridamole, especially if they have coronary artery disease, bleeding disorders, or hypersensitivity to the drug. It is crucial to inform healthcare experts of any missed doses or potential overdoses, as well as to store the medication properly and avoid alcohol consumption while taking Dipyridamole. Regular monitoring and adherence to precautions can help ensure safe and effective use of this Dipyridamole.

Uses of Dipyridamole

  • Preventing blood clots after heart valve replacement is essential.

How to Use Dipyridamole?


Strengths and Forms

Injectable Solution

  • 5mg/mL


  • 25mg
  • 50mg
  • 75mg

Recommended Dosage for Different Patients

For prevention of blood clots post-heart valve surgery:

  • Typically, 75-100 mg orally every 6 hours or as a healthcare provider prescribes.

For stroke prevention (as part of Aggrenox combination therapy):

  • Usually, one capsule contains 25 mg of aspirin and 200 mg of Dipyridamole twice daily, under medical guidance.

For pharmacological stress testing:

  • Dosage typically ranges from 0.56 to 0.84 mg/kg (up to 60 mg maximum), given intravenously over 4 minutes, in conjunction with imaging techniques.

[Note: Remember, these recommendations may vary from person to person. Consult with your doctor, and they’ll customize your dosage accordingly.]

How to Take It?

  • Consume Dipyridamole orally as directed by your doctor
  • The typical dosage is 25-50 mg four times daily
  • Take the Dipyridamole doses at evenly spaced intervals throughout the day
  • Swallow the extended-release capsules or tablets whole; do not crush or chew
  • You can take Dipyridamole with or without food
  • If you miss a dose, take it as soon as you remember unless it’s almost time for the next dose.
  • Do not double the medication dose to make up for a missed one
  • Take Dipyridamole at the exact times each day for the best results
  • Do not stop taking Dipyridamole suddenly without your doctor’s advice
  • Avoid activities that can cause bleeding/bruising while taking this medication
  • Notify your doctor if you have a planned surgery or dental procedure
  • Check with your pharmacist before taking any new medicines with Dipyridamole

[Note: Your doctor will decide the proper dosage for you based on your condition, following guidelines and research studies on this medication. They’ll adjust it as needed over time.]

How Does Dipyridamole Work?

Dipyridamole works by inhibiting the breakdown of adenosine, a chemical that helps widen blood vessels and improve blood flow. By increasing adenosine levels, Dipyridamole promotes vasodilation, reducing the risk of blood clot formation. Additionally, it enhances platelet inhibition when combined with other antiplatelet agents like aspirin. These mechanisms collectively help prevent blood clots, making Dipyridamole valuable in various cardiovascular conditions and stroke prevention strategies.

Important Safety Information

Side Effects

Common side effects of this medication may include:

  • Headache
  • Dizziness
  • Nausea/Vomiting
  • Flushing (redness of skin)
  • Hypotension (low blood pressure)
  • Chest pain or tightness
  • Palpitations (irregular heartbeat)
  • Abdominal cramps
  • Diarrhea
  • Muscle pain or cramps
  • Rash or itching
  • Fatigue
  • Shortness of breath
  • Bruising or bleeding more easily

Serious side effects of this medicine may include:

Heart-related side effects:

  • Angina (chest pain)
  • Myocardial infarction (heart attack)
  • Arrhythmias (irregular heartbeats)
  • Worsening of heart failure

Cerebrovascular side effects:

  • Stroke
  • Transient ischemic attack (TIA or mini-stroke)

Blood disorders:

  • Thrombocytopenia (low platelet count, increasing bleeding risk)
  • Hemolytic anemia (breakdown of red blood cells)
  • Agranulocytosis (severe deficiency of white blood cells)

Hypersensitivity reactions:

  • Anaphylaxis (severe whole-body allergic reaction)
  • Angioedema (swollen face, lips, tongue, or throat)

Gastrointestinal side effects:

  • Gastrointestinal bleeding or ulceration
  • Intestinal ischemia (reduced blood flow to intestines)

Hepatic and renal side effects:

  • Liver toxicity or hepatitis
  • Kidney injury or failure

[Note: Remember, this list may not cover all possible side effects. You should always consult your healthcare expert for medical advice about medication side effects.]


  • Coronary artery disease: Dipyridamole can increase the risk of myocardial infarction (heart attack), angina, and arrhythmias in patients with coronary artery disease. It should be used with caution in these patients.
  • Cerebrovascular disease: Patients with cerebrovascular disease or those at risk for stroke may have an increased probability of stroke or transient ischemic attack (TIA) while taking Dipyridamole.
  • Hypotension: Dipyridamole can significantly lower blood pressure, especially when combined with other antihypertensive medications. Caution is advised in patients with hypotension or those at risk for it.
  • Bleeding risk: This medication can increase the chances of bleeding, especially in individuals with bleeding issues, active gastric or duodenal ulcers, or those taking other drugs that can affect bleeding (e.g., anticoagulants, NSAIDs).
  • Hypersensitivity reactions: It can cause severe allergic reactions, including anaphylaxis and angioedema. It should be avoided in patients with a known hypersensitivity to this medication or its components.
  • Bone marrow suppression: It has been associated with thrombocytopenia, hemolytic anemia, and agranulocytosis, which can be life-threatening. Regular blood monitoring is recommended.
  • Contraindications: It is contraindicated in patients with certain conditions, such as severe coronary artery disease, recent myocardial infarction, severe heart failure, and certain types of arrhythmias.
  • Pregnancy and breast-feeding: Dipyridamole should be used with caution during pregnancy and breastfeeding due to severe risks to the fetus or infant.


Drug interactions:

  • Dipyridamole can interact with many medications, including anticoagulants, antiplatelets, NSAIDs, and certain antidepressants. Inform your doctor of all medicines you’re taking.
  • Avoid taking Dipyridamole with aspirin or other NSAIDs unless specifically instructed by your doctor.

Medical conditions:

  • Use by taking proper caution in patients with coronary artery disease, cerebrovascular disease, hypotension, bleeding disorders, or diseases affecting the liver or kidneys.
  • Dipyridamole may worsen symptoms of heart failure or angina.

Surgery/dental procedures:

  • Inform healthcare providers that you are taking Dipyridamole before any surgical or dental procedures due to the increased risk of bleeding.


  • Routine blood tests may be needed to monitor for side effects like thrombocytopenia (low platelets) or hemolytic anemia.
  • Blood pressure should be monitored, especially when starting or adjusting the dose.


  • Do not stop taking Dipyridamole suddenly without consulting your doctor, as this may increase the risk of blood clots.

Pregnancy and breastfeeding:

  • During pregnancy or breastfeeding, Dipyridamole should only be used if the potential health benefits for the mother outweigh the possible dangers to the unborn or nursing child.

Alcohol consumption:

  • Avoid excessive alcohol consumption while taking Dipyridamole, as it may increase the risk of side effects.


Contraindications: Dipyridamole is contraindicated in patients with certain conditions, such as severe coronary artery disease, recent myocardial infarction, severe heart failure, and certain types of arrhythmias.

Missed Dose

If you have missed a dose of Dipyridamole, take it as soon as you remember. However, if it is almost time for your next scheduled dose, skip the missed dose and continue with your regular dosing schedule. Do not double the dose to make up for a missed one. Missed doses should never be compensated by taking extra medication, as this can increase the risk of adverse effects and complications. 

[Note: If you have missed a Dipyridamole dose and are unsure about the next one, immediately consult your doctor or pharmacist.]


An overdose of Dipyridamole can lead to severe and potentially life-threatening consequences. In cases of Dipyridamole overdose, patients may experience severe headaches, dizziness, hypotension (low blood pressure), tachycardia (rapid heartbeat), nausea, vomiting, and abdominal pain. More severe effects can include myocardial ischemia (reduced blood flow to the heart), cardiac arrhythmias, heart failure, seizures, and bleeding complications due to the antiplatelet action of the drug. 

[Note: If you consume more than the recommended dose, get medical help immediately or contact the Poison Help line at 1-800-222-1222.]


  • Keep it at room temperature, away from heat and moisture.
  • Store it in its original container, tightly closed.
  • Avoid exposing it to direct sunlight.
  • Keep it out of reach of kids and pets.
  • Avoid storing Dipyridamole in the bathroom or kitchen.
  • Check the medicine’s expiration date and discard it properly if it has expired.

[Note: Discuss with your healthcare expert the proper disposal of unused medication and any questions you may have regarding its storage.]

Dipyridamole Interactions

  • Anticoagulants and antiplatelets: Dipyridamole can increase the anticoagulant and antiplatelet effects of drugs like warfarin, heparin, clopidogrel, and aspirin, leading to an increased risk of bleeding.
  • Non-steroidal anti-inflammatory drugs: Drugs like ibuprofen and naproxen, can counteract the antiplatelet effects of Dipyridamole and increase the risk of thrombotic events.
  • Adenosine: Dipyridamole can potentiate the effects of adenosine, increasing the risk of bradycardia, hypotension, and other cardiovascular side effects.
  • Antihypertensive medications: Dipyridamole can enhance the blood pressure-lowering effects of certain antihypertensive drugs, potentially leading to hypotension.
  • Diuretics: Concomitant use of Dipyridamole and diuretics may increase the risk of hypotension and electrolyte imbalances.
  • Cholinesterase inhibitors: Dipyridamole can increase the risk of bradycardia and other adverse effects when used with cholinesterase inhibitors like donepezil or rivastigmine.
  • Theophylline: Dipyridamole can increase the plasma levels of theophylline, potentially leading to toxicity.
  • Antidepressants (e.g., SSRIs, SNRIs): Concomitant use with certain antidepressants may heighten the risk of bleeding as a result of their antiplatelet effects.

[Note: This isn’t a complete list and other potential interactions with Dipyridamole could exist. Inform your doctor about prescription, over-the-counter medicines, and herbal products.]

Dipyridamole Alternatives

[Note: Your doctor will choose the most suitable drug alternative. Avoid taking any of these alternative medications without consulting your healthcare professional. Taking them on your own may cause serious side effects.] 

Frequently Asked Questions

Why is Dipyridamole necessary post-heart valve surgery?

Post-heart valve surgery, you may be prone to blood clot buildup, increasing the risk of complications like strokes or heart attacks. Dipyridamole helps prevent clotting. Your provider may also prescribe medications like warfarin (Coumadin), aspirin, apixaban (Eliquis), or rivaroxaban (Xarelto) based on your surgery type. Adhering strictly to your prescription is crucial for optimal prevention.

How long do I need to take Persantine?

The duration of Persantine treatment varies based on your heart valve surgery and response to the medication. It may range from a few months to several years. Your doctor will assess your progress and suggest the appropriate duration for which to take this medicine. Follow their recommendations closely for optimal recovery and management of your heart condition.

Can Dipyridamole be safely used during pregnancy?

Limited studies exist on Dipyridamole use during pregnancy, warranting caution. It should only be utilized if deemed necessary by a healthcare provider, who can explore alternative options.

How is Dipyridamole used in stress tests?

In stress tests, particularly for those unable to exercise or at high risk during exertion, Dipyridamole is administered intravenously. This medication increases blood flow to detect heart abnormalities, aiding in assessing blood flow adequacy and identifying potential heart issues.

Are Dipyridamole and Aggrenox (aspirin / Dipyridamole) identical?

No, they are not the same. While Dipyridamole is a single medication used to prevent blood clots post-heart valve surgery, Aggrenox (aspirin / Dipyridamole) combines aspirin and Dipyridamole to prevent strokes by inhibiting platelet aggregation.

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