Thursday, October 6, 2016

Persantine


Generic Name: Dipyridamole
Class: Vasodilating Agents, Miscellaneous
VA Class: BL117
CAS Number: 58-32-2

Introduction

A non-nitrate coronary vasodilator and platelet aggregation inhibitor.100 170 171 172


Uses for Persantine


Thromboembolism Associated with Prosthetic Heart Valves


Used as an adjunct to coumarin anticoagulants for the prevention of postoperative thromboembolic complications of heart valve replacement.100 101 102 103 104 105 106 107 108 156 Data are insufficient to recommend the use of dipyridamole over the combination of low-dose aspirin and warfarin in such patients.156


Should not be used alone, without an oral anticoagulant, in patients with mechanical prosthetic heart valves.101 102 105 108 109 140 141 142


Transient Ischemic Attacks and Completed Thrombotic Stroke


Used in extended-release form in fixed combination with aspirin for secondary prevention of stroke in patients who have had TIAs or completed thrombotic stroke.145 146 147 148 149 154 164


The American College of Chest Physicians (ACCP), American Stroke Association (ASA), and AHA consider the fixed combination of aspirin and extended-release dipyridamole an acceptable option for initial antiplatelet therapy for secondary prevention of noncardioembolic ischemic stroke and TIAs.147 149 150 154 164 180 In such patients, ACCP, ASA, and AHA recommend the combination of aspirin and extended-release dipyridamole over therapy with aspirin alone and suggest therapy with clopidogrel alone over aspirin alone.154 164 180


Adjunct to Thallium Myocardial Perfusion Imaging


Used IV as an adjunct to thallous (thallium) chloride Tl 201 myocardial perfusion imaging in patients unable to exercise adequately.157 158 159 165


ACC and AHA recommend myocardial stress perfusion imaging with dipyridamole or adenosine or dobutamine echocardiography before or early after hospital discharge in patients with ST-segment-elevation MI who are not undergoing cardiac catheterization and who are unable to exercise.157


Persantine Dosage and Administration


Administration


Administer orally or IV.100 158


Oral Administration


Administer conventional tablets 4 times daily.100


Administer extended-release dipyridamole and aspirin fixed-combination capsules twice daily in the morning and evening without regard to food.145 Swallow capsules whole without chewing.145


Extended-release dipyridamole in fixed combination with aspirin is not interchangeable with the individual components of aspirin and conventional dipyridamole tablets (e.g., Persantine).145


IV Administration


Dilution

Dilute injection in ≥1:2 ratio with 0.45% sodium chloride injection, 0.9% sodium chloride injection, or 5% dextrose injection to a final volume of approximately 20–50 mL.158


Rate of Administration

Adjunct to thallium myocardial perfusion imaging: 0.142 mg/kg per minute for 4 minutes.158


Administration Risks

Infusion of undiluted injection may cause local irritation.158


Dosage


Adults


Thromboembolism Associated with Prosthetic Heart Valves

Prophylaxis

Oral

Conventional tablets: 75–100 mg 4 times daily; use in conjunction with coumarin anticoagulant therapy.100 101 102 104 105 106 107 108


Transient Ischemic Attacks and Completed Thrombotic Stroke

Secondary Prevention

Oral

Fixed combination with aspirin: 200 mg of extended-release dipyridamole and 25 mg of aspirin (1 capsule) twice daily in the morning and evening.145 154


If headaches become intolerable during initial treatment, reduce dosage to 200 mg of dipyridamole and 25 mg of aspirin (1 capsule) once daily at bedtime; administer low-dose aspirin in the morning.145 Resume the usual regimen (200 mg of extended-release dipyridamole and 25 mg of aspirin twice daily) as soon as possible (usually within 1 week) because no outcome data available with the reduced-dose regimen and headaches diminish during continued treatment.145


Dose of aspirin in fixed-combination product may not be adequate to prevent recurrent MI or angina pectoris in patients with stroke or TIA.145


If an antiplatelet effect is not desired in patients undergoing elective surgery, discontinue therapy with dipyridamole in fixed combination with aspirin 7–10 days prior to elective surgery.175


Adjunct to Thallium Myocardial Perfusion Imaging

IV

Single IV dose of 0.57 mg/kg, infused at a rate of 0.142 mg/kg per minute for 4 minutes.158 165 Maximum tolerated IV dose not determined; clinical experience suggests that a total dose >60 mg is not needed for any patient.158


Inject thallium-201 IV ≤5 minutes following completion of the dipyridamole infusion.158


Prescribing Limits


Adults


Adjunct to Thallium Myocardial Perfusion Imaging

IV

Clinical experience suggests that a total dipyridamole dose >60 mg is not needed for any patient.158


Cautions for Persantine


Contraindications



  • Known hypersensitivity to dipyridamole or any ingredient in the formulation.100 145 158



Warnings/Precautions


Warnings


Cardiovascular and Cerebrovascular Effects

Serious adverse effects, including acute myocardial ischemia or MI, cardiac death, VF, symptomatic VT, stroke, transient cerebral ischemia, and seizures, reported with IV infusion.158 Asystole, sinus node arrest, sinus node depression, and conduction block reported also reported with IV infusion.158 Patients with abnormalities of cardiac impulse formation or conduction or severe CAD (e.g., unstable angina) may be at increased risk for these events.158


Weigh the important clinical information to be gained by myocardial perfusion thallium imaging with IV dipyridamole against the risk to the patient. 158 Consider the rate of false positive and false negative results of dipyridamole-assisted thallium imaging compared with coronary arteriography when choosing to use such imaging.158


Monitor vital signs during and for 10–15 minutes after IV infusion; obtain an ECG using ≥1 chest lead.158


Appropriate resuscitative measures should be readily available for relieving adverse effects such as severe chest pain.158 If severe chest pain occurs, administer IV aminophylline in doses of 50–250 mg by slow IV injection (e.g., 50–100 mg over 30–60 seconds).158 (See Specific Drugs under Interactions.) Place patients with severe hypotension in a supine position with the head tilted down, if necessary, before administration of IV aminophylline.158 If the highest recommended dosage of aminophylline (250 mg) does not relieve chest pain within a few minutes, may administer sublingual nitroglycerin.158 If chest pain continues despite such combination therapy, consider the possibility of MI.158


If the clinical condition of the patient with an adverse event permits a 1-minute delay, may perform thallium imaging before reversal of the pharmacologic effects occurs.158 165


Sensitivity Reactions


Anaphylactoid reactions and bronchospasm reported with IV dipyridamole.158 Patients with a history of asthma may be at greater risk for bronchospasm.158


Appropriate resuscitative measures should be readily available for relieving adverse effects such as severe bronchospasm.158 165 If severe bronchospasm occurs, administer aminophylline in doses of 50–250 mg by slow IV injection (e.g., 50–100 mg over 30–60 seconds).158 (See Cardiovascular and Cerebrovascular Effects under Cautions.)


General Precautions


Use of Fixed Combinations

When used in fixed combination with aspirin, consider the cautions, precautions, and contraindications associated with aspirin.145


Cardiovascular Effects

Use with caution in patients with hypotension or severe CAD (e.g., unstable angina, recently sustained MI) since peripheral vasodilation may occur.100 145 Dipyridamole may precipitate chest pain in patients with CAD.100 145


Amount of aspirin in the commercially available fixed-combination product may not be adequate to prevent recurrent MI or angina pectoris in patients with stroke or TIA.145


Hepatic Effects

Liver dysfunction (e.g., elevations of hepatic enzymes, hepatic failure) reported.100 145


Specific Populations


Pregnancy

Category B: Conventional tablets and injection.100 158


Category D: Fixed combination with aspirin.145


Lactation

Distributed into milk.100 145 158 Use caution.100 145


Pediatric Use

Conventional tablets: Safety and efficacy not established in pediatric patients <12 years of age.100


Fixed combination with aspirin: Safety and efficacy not established;145 should not be used in pediatric patients because of aspirin component.145


Injection: Safety and efficacy not established.158


Common Adverse Effects


Conventional tablets: Headache,100 dizziness,100 GI intolerance (e.g., abdominal distress),100 vomiting,100 diarrhea,100 flushing,100 rash,100 pruritus.100


Injection: Chest pain/angina pectoris,158 ECG changes (most commonly ST-T changes),158 headache,158 dizziness.158


Interactions for Persantine


Specific Drugs





















Drug



Interaction



Comments



Adenosine



Potentiation of adenosine vasoactive effects100 168 169


Increased plasma adenosine concentrations100 168 169



Dosage adjustment of adenosine may be necessary100 168 169



Anticholinesterase agents



Antagonizes anticholinesterase effects100 158



Potential to aggravate myasthenia gravis100 158



Heparin



Possible increased risk of bleeding complications166 167



Use with caution and monitor closely166 167



Methylxanthines (e.g., aminophylline, caffeine [e.g., coffee], theophylline



Inhibits dipyridamole vasodilatory and bronchospastic effects158 165



Aminophylline used to terminate persistent adverse effects of dipyridamole158


Caffeine or theophylline may lead to false-negative thallium imaging results;158 some clinicians recommend withholding caffeine (e.g., coffee) for 24 hours prior to testing165



Warfarin



Possible increased risk of bleeding, particularly during or after surgery; however, concomitant use does not appear to increase frequency or severity of bleeding compared with use of warfarin alone100



Some clinicians recommend maintenance of PT in the lower end of the therapeutic rangea


Persantine Pharmacokinetics


Absorption


Bioavailability


Absorption from GI tract is variable and incomplete;101 134 135 137 138 171 37–66% of an oral dose (extended-release capsules containing dipyridamole in fixed combination with aspirin) may be absorbed.171


Following oral administration of conventional tablets, peak plasma concentrations attained in about 45–150 minutes (mean: 75 minutes).100 134 135 136 138 Peak plasma dipyridamole concentrations attained in about 2 hours (range: 1–6 hours) with twice-daily dosing of extended-release capsules containing dipyridamole in fixed combination with aspirin.145


Onset


Injection: Peak increase in coronary blood flow occurs 6.5 minutes after initiation of infusion.158


Duration


Following IV infusion, vital signs return to baseline in approximately 30 minutes.158 165


Food


Capsules containing extended-release dipyridamole in fixed combination with aspirin: High-fat meal reduces peak plasma dipyridamole concentrations and total absorption at steady state by 20–30% compared with fasting state; not clinically relevant.145


Distribution


Extent


In animals, widely distributed into body tissues; small amounts cross placenta.a


Does not cross the blood-brain barrier in animals.145 171


Distributed into milk.100 158 172


Plasma Protein Binding


91–99%,101 134 138 139 158 158 171 principally to α1-acid glycoprotein (α1-AGP) but also to albumin.158 161 162


Elimination


Metabolism


Metabolized in liver principally to monoglucuronide; small amount metabolized to diglucuronide.100 145 158


Elimination Route


Metabolites eliminated principally in feces via biliary excretion100 145 158 and to a much lesser extent in urine.145


Half-life


Conventional tablets: Biphasic; initial half-life approximately 40–80 minutes and terminal half approximately 10–12 hours.100 101 134 138 175 179


Extended-release capsules containing dipyridamole in fixed combination with aspirin: 13.6 hours.145


IV: Triphasic; mean half-lives of 3–12 minutes, 33–62 minutes, and 11.6–15.5 hours.158


Stability


Storage


Oral


Capsules and Tablets

Conventional tablets: 25°C (may be exposed to 15–30°C).100


Extended-release capsules containing dipyridamole in fixed combination with aspirin: 25°C (may be exposed to 15–30°C); protect from excessive moisture.145


Parenteral


Solution for Injection

20–25°C; avoid freezing and protect from light.158


Compatibility


For information on systemic interactions resulting from concomitant use, see Interactions.


Parenteral


Do not mix with other drugs in the same syringe or infusion container.158


ActionsActions



  • Mechanism of antiplatelet effects not fully elucidated.100 101 134 170




  • Inhibits the uptake and metabolism of adenosine in platelets, endothelial cells and erythrocytes.100 145 171 Increased local concentrations of adenosine at the platelet surface stimulate platelet adenyl cyclase and increase platelet cyclic-3′,5′-adenosine monophosphate (cAMP) concentrations.100 145 171 Increased platelet cAMP concentrations affect platelet-activating factor, collagen, and adenosine diphosphate and inhibit mobilization of free calcium, which is involved in platelet activation.100 170 171 Also stimulates prostacyclin synthesis and potentiates antiplatelet effects of prostacyclin.171




  • Inhibits platelet cyclic-3′,5′-guanosine monophosphate phosphodiesterase (cGMP-PDE).100 145 171 n Augments increase in platelet cGMP concentrations produced by nitric oxide;100 145 increased cGMP platelet concentrations inhibit platelet activation and aggregation.171 n




  • Prolongs platelet survival time in patients with prosthetic heart valves or valvular heart disease in whom platelet survival is shortened.100 a




  • Mediates coronary vasodilation by inhibiting reuptake and thereby allowing accumulation of adenosine in vascular smooth muscle.158 165 n




  • Methylxanthine derivatives (e.g., theophylline, aminophylline) block adenosine receptors on vascular smooth muscle and abolish vasodilatory effects of dipyridamole.158 165 (See Specific Drugs under Interactions.)




  • Increases blood flow in normal coronary arteries while producing reduced blood flow in stenotic arteries (“coronary steal”).158 165 Myocardial oxygen consumption and cardiac work not increased.165




  • Myocardial uptake of thallous (thallium) chloride Tl 201 is directly proportional to coronary blood flow.159 165 Less thallous chloride Tl 201 uptake159 occurs in myocardium perfused by stenotic versus normal coronary arteries.158 159 160 Enhances the differences in blood flow between areas served by stenotic versus normal arteries during thallium testing.158 159 160 165




  • With IV administration, decreases BP and increases heart rate and cardiac output because of dilation of systemic resistance vessels.158 170 a With usual oral dosages, generally no change in BP or blood flow in peripheral arteries.170 a



Advice to Patients



  • Importance of informing clinicians of existing or contemplated concomitant therapy, including prescription and OTC drugs and dietary or herbal supplements, as well as any concomitant illnesses.100 145 158




  • Importance of women informing their clinician if they are or plan to become pregnant or plan to breast-feed.100 145 158




  • Importance of informing patients of other important precautionary information.100 145 158 (See Cautions.)



Preparations


Excipients in commercially available drug preparations may have clinically important effects in some individuals; consult specific product labeling for details.


* available from one or more manufacturer, distributor, and/or repackager by generic (nonproprietary) name











































Dipyridamole

Routes



Dosage Forms



Strengths



Brand Names



Manufacturer



Oral



Tablets



25 mg*



Dipyridamole Tablets



Persantine



Boehringer Ingelheim



50 mg*



Dipyridamole Tablets



Persantine



Boehringer Ingelheim



75 mg*



Dipyridamole Tablets



Persantine



Boehringer Ingelheim



Parenteral



Injection, for IV use



5 mg/mL*



Dipyridamole Injection













Dipyridamole Combinations

Routes



Dosage Forms



Strengths



Brand Names



Manufacturer



Oral



Capsules, extended-release (containing dipyridamole pellets and 25 mg immediate-release aspirin tablet)



200 mg with Aspirin 25 mg



Aggrenox



Boehringer Ingelheim


Comparative Pricing


This pricing information is subject to change at the sole discretion of DS Pharmacy. This pricing information was updated 03/2011. Actual costs to patients will vary depending on the use of specific retail or mail-order locations and health insurance copays.


Aggrenox 25-200MG 12-hr Capsules (BOEHRINGER INGELHEIM): 60/$195.99 or 180/$559.95


Dipyridamole 25MG Tablets (TEVA PHARMACEUTICALS USA): 100/$29.99 or 300/$83.97


Dipyridamole 50MG Tablets (GLENMARK PHARMACEUTICALS): 90/$54.99 or 270/$145.96


Dipyridamole 75MG Tablets (GLENMARK PHARMACEUTICALS): 100/$69.99 or 300/$189.98


Persantine 25MG Tablets (BOEHRINGER INGELHEIM): 100/$85.99 or 300/$235.98


Persantine 50MG Tablets (BOEHRINGER INGELHEIM): 100/$139.99 or 300/$399.95


Persantine 75MG Tablets (BOEHRINGER INGELHEIM): 100/$169.99 or 300/$487.97



Disclaimer

This report on medications is for your information only, and is not considered individual patient advice. Because of the changing nature of drug information, please consult your physician or pharmacist about specific clinical use.


The American Society of Health-System Pharmacists, Inc. and Drugs.com represent that the information provided hereunder was formulated with a reasonable standard of care, and in conformity with professional standards in the field. The American Society of Health-System Pharmacists, Inc. and Drugs.com make no representations or warranties, express or implied, including, but not limited to, any implied warranty of merchantability and/or fitness for a particular purpose, with respect to such information and specifically disclaims all such warranties. Users are advised that decisions regarding drug therapy are complex medical decisions requiring the independent, informed decision of an appropriate health care professional, and the information is provided for informational purposes only. The entire monograph for a drug should be reviewed for a thorough understanding of the drug's actions, uses and side effects. The American Society of Health-System Pharmacists, Inc. and Drugs.com do not endorse or recommend the use of any drug. The information is not a substitute for medical care.

AHFS Drug Information. © Copyright, 1959-2011, Selected Revisions February 2011. American Society of Health-System Pharmacists, Inc., 7272 Wisconsin Avenue, Bethesda, Maryland 20814.




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