Prasugrel can cause significant, sometimes fatal, bleeding. Do not use prasugrel in patients with active pathological bleeding or a history of transient ischemic attack (TIA) or stroke.
In patients ≥75 years, prasugrel is generally not recommended because of the increased risk of fatal and intracranial bleeding and uncertain benefit, except in high-risk situations (patients with diabetes or a history of myocardial infarction [MI]) in which its effect appears to be greater and its use may be considered.
Do not start prasugrel in patients likely to undergo urgent coronary artery bypass graft (CABG) surgery. When possible, discontinue prasugrel at least 7 days prior to any surgery.
Additional risk factors for bleeding include body weight <60 kg, propensity to bleed, and concomitant use of medications that increase the risk of bleeding (eg, warfarin, heparin, fibrinolytic therapy, long-term use of nonsteroidal anti-inflammatory drugs [NSAIDs]).
Suspect bleeding in any patient who is hypotensive and has recently undergone coronary angiography, percutaneous coronary intervention (PCI), CABG, or other surgical procedures in the setting of prasugrel.
If possible, manage bleeding without discontinuing prasugrel. Discontinuing prasugrel, particularly in the first few weeks after acute coronary syndrome (ACS), increases the risk of subsequent cardiovascular events.
Dosage guidance:
Safety: Avoid use in patients with active bleeding or a history of stroke or transient ischemic attack. In patients who require concomitant therapeutic anticoagulation, antiplatelet selection and/or duration of therapy may differ in order to balance risks for thrombosis and bleeding (Ref).
Acute coronary syndrome (non-ST-elevation myocardial infarction, unstable angina, or ST-elevation myocardial infarction) managed by percutaneous coronary intervention:
Note: For ST-elevation myocardial infarction managed with primary percutaneous coronary intervention (PCI), administer as early as possible after diagnosis. For non-ST-elevation acute coronary syndromes, administer after angiography once clinician decides to perform PCI; if PCI is not performed, use an alternative P2Y12 inhibitor (Ref).
Loading dose: Oral: 60 mg once before PCI in combination with aspirin and a parenteral anticoagulant; followed by maintenance dosing. If coronary angiography is planned soon after diagnosis, it is reasonable to delay the initial loading dose until after coronary anatomy is known (Ref).
Maintenance dose:
Oral: ≥60 kg: 10 mg once daily in combination with aspirin beginning the day after PCI (Ref).
Oral: <60 kg: 5 mg once daily in combination with aspirin beginning the day after PCI (Ref). An alternative P2Y12 inhibitor may be considered if bleeding is major concern (Ref).
Duration of therapy:
Preferred approach: Continue prasugrel plus aspirin (dual antiplatelet therapy [DAPT]) for ≥12 months unless major bleeding is a concern. For patients at high risk of bleeding or who experience overt bleeding, DAPT for 6 months may be reasonable. If there have been no major bleeding complications after 12 months, continuation of DAPT may be considered. Reevaluate the need for DAPT at regular intervals based on bleeding and thrombotic risks. When DAPT is complete, discontinue prasugrel and continue aspirin indefinitely for secondary prevention (Ref).
Alternative approach in select patients to minimize bleeding events: Prasugrel in combination with aspirin (DAPT) should be continued for 1 to 3 months after PCI, then discontinue aspirin and continue prasugrel monotherapy. When prasugrel is discontinued, restart aspirin for secondary prevention (Ref).
Transitioning between P2Y12 inhibitors:
Note: This provides general guidance on transitioning between P2Y12 inhibitors.
Transitioning from another P2Y12 inhibitor to prasugrel:
Transitioning from clopidogrel:
≤30 days after acute coronary syndrome (ACS) or PCI: Give prasugrel 60 mg loading dose once (irrespective of timing of previous clopidogrel dose), followed the next day by 10 mg once daily (≥60 kg) or 5 mg once daily (<60 kg) (Ref).
>30 days after ACS or PCI: Give prasugrel 10 mg once daily (≥60 kg) or 5 mg once daily (<60 kg) beginning 24 hours after the last dose of clopidogrel (Ref).
Transitioning from ticagrelor: Give prasugrel 60 mg loading dose 12 to 24 hours after the last dose of ticagrelor, followed the next day by 10 mg once daily (≥60 kg) or 5 mg once daily (<60 kg) (Ref).
Dosage adjustment for concomitant therapy: Significant drug interactions exist, requiring dose/frequency adjustment or avoidance. Consult drug interactions database for more information.
The renal dosing recommendations are based upon the best available evidence and clinical expertise. Senior Renal Editorial Team: Bruce Mueller, PharmD, FCCP, FASN, FNKF; Jason A. Roberts, PhD, BPharm (Hons), B App Sc, FSHP, FISAC; Michael Heung, MD, MS.
Note: In general, patients with moderate to severe kidney impairment have an increased risk for bleeding; monitor closely (Ref).
Altered kidney function: Oral: No dosage adjustment necessary for any degree of kidney impairment (Ref).
Hemodialysis, intermittent (thrice weekly): Unlikely to be significantly dialyzable (highly protein bound): Oral: No supplemental dose or dosage adjustment necessary (Ref).
Peritoneal dialysis: Unlikely to be significantly dialyzable (highly protein bound): Oral: No dosage adjustment necessary (Ref).
CRRT: Oral: No dosage adjustment necessary (Ref).
PIRRT (eg, sustained, low-efficiency diafiltration): Oral: No dosage adjustment necessary (Ref).
Mild to moderate hepatic impairment (Child-Pugh class A and B): No dosage adjustment necessary for mild-to-moderate hepatic impairment.
Severe hepatic impairment (Child-Pugh class C): There are no dosage adjustments provided in the manufacturer's labeling (has not been studied); use caution (patients are generally at higher risk of bleeding).
Patients ≥75 years of age: Use is generally not recommended; may be considered in high-risk situations (eg, patients with diabetes or history of myocardial infarction).
Acute coronary syndrome (non-ST-elevation myocardial infarction, unstable angina, or ST-elevation myocardial infarction) managed by percutaneous coronary intervention:
Patients ≥75 years of age:
Loading dose: See adult dosing
Maintenance dose: Oral: 5 mg once daily in combination with aspirin beginning the day after PCI. An alternative P2Y12 inhibitor may be considered if bleeding is a major concern (Ref).
The following adverse drug reactions and incidences are derived from product labeling unless otherwise specified.
1% to 10%:
Cardiovascular: Hypertension (8%), hypotension (4%), atrial fibrillation (3%), bradycardia (3%), peripheral edema (3%)
Central nervous system: Headache (6%), dizziness (4%), fatigue (4%), noncardiac chest pain (3%)
Dermatologic: Skin rash (3%)
Endocrine & metabolic: Hypercholesterolemia (≤7%), hyperlipidemia (≤7%)
Gastrointestinal: Nausea (5%), diarrhea (2%), gastrointestinal hemorrhage (2%)
Hematologic & oncologic: Leukopenia (3%), anemia (2%), major hemorrhage (2%), minor hemorrhage (2%), major hemorrhage (life-threatening: 1%)
Neuromuscular & skeletal: Back pain (5%), limb pain (3%)
Respiratory: Epistaxis (6%), dyspnea (5%), cough (4%)
Miscellaneous: Fever (3%)
<1%, postmarketing, and/or case reports: Abnormal hepatic function tests, anaphylaxis, angioedema, hematoma, hemoptysis, hemorrhage (requiring inotropes or transfusion), hypersensitivity reaction, intracranial hemorrhage (symptomatic), re-operation due to bleeding, thrombocytopenia, thrombotic thrombocytopenic purpura
Hypersensitivity (eg, anaphylaxis) to prasugrel or any component of the formulation; active pathological bleeding (eg, peptic ulcer, intracranial hemorrhage); prior transient ischemic attack or stroke.
Canadian labeling: Additional contraindications (not in US labeling): Severe hepatic impairment (Child-Pugh Class C).
Concerns related to adverse effects:
• Bleeding: [US Boxed Warning]: May cause significant, sometimes fatal, bleeding. Do not use prasugrel in patients with active pathological bleeding or a history of TIA or stroke. Additional risk factors for bleeding include body weight <60 kg, propensity to bleed (eg, recent trauma, recent surgery, recent or recurrent GI bleeding, active peptic ulcer disease, severe hepatic impairment, or moderate to severe renal impairment), and concomitant use of medications that increase the risk of bleeding (eg, warfarin, heparin, fibrinolytic therapy, long-term use of NSAIDs). Suspect bleeding in any patient who is hypotensive and has recently undergone coronary angiography, PCI, CABG, or other surgical procedures in the setting of prasugrel. If possible, manage bleeding without discontinuing prasugrel. Discontinuing prasugrel, particularly in the first few weeks after ACS, increases the risk of subsequent cardiovascular events. Management of bleeding episodes includes the use of PRBCs and platelet transfusion.
• Hypersensitivity: Hypersensitivity, including angioedema, has been reported, including in patients with a previous history of thienopyridine hypersensitivity. Because of structural similarities, cross-reactivity is possible among the thienopyridines (clopidogrel, prasugrel, and ticlopidine); use with caution or avoid in patients with previous history of thienopyridine hypersensitivity. Use of prasugrel is contraindicated in patients with hypersensitivity (eg, anaphylaxis) to prasugrel.
• Thrombotic thrombocytopenic purpura (TTP): Cases of TTP (usually occurring within the first 2 weeks of therapy), resulting in some fatalities, have been reported with prasugrel; urgent plasmapheresis is required.
Disease-related concerns:
• GI disease: Use with caution in patients with recent or recurrent GI bleeding or active peptic ulcer disease (patients are generally at higher risk of bleeding).
• Hepatic impairment: Use with caution in patients with severe hepatic impairment (patients are generally at higher risk of bleeding).
• Renal impairment: Use with caution in patients with moderate to severe renal impairment (patients are generally at higher risk of bleeding).
Special populations:
• Older adult: [US Boxed Warning]: In patients ≥75 years, use is generally not recommended due to increased risk of fatal and intracranial bleeding and uncertain benefit, except in high-risk situations (patients with diabetes or a history of MI) in which its effect appears to be greater and its use may be considered.
• Lower GI bleed patients: An individualized and multidisciplinary approach should be utilized to determine therapy discontinuation and management in patients with acute lower GI bleed (LGIB) who are on antiplatelet medications; risk of ongoing bleeding should be weighed with risk of thromboembolic events. In patients receiving dual antiplatelet therapy (aspirin plus P2Y12 receptor blocker [eg, clopidogrel, prasugrel, ticagrelor, ticlopidine]) or P2Y12 inhibitor monotherapy, the P2Y12 inhibitor should generally be resumed as soon as possible and at least within 7 days, taking into account control of bleeding and cardiovascular risk (aspirin should not be discontinued) (Strate 2016).
• Low-weight patients: In patients weighing <60 kg, risk of bleeding increased; consider lower maintenance dose.
• Surgical patients: [US Boxed Warning]: Do not initiate therapy in patients likely to undergo urgent CABG surgery; when possible, discontinue ≥7 days prior to any surgery; increased risk of bleeding. Patient-specific situations should be discussed with a cardiologist, interventional cardiologist, and a cardiac surgeon (ACC/AHA [Grines 2007]; ACC/AHA [Hillis 2011]; ACC/AHA [Lawton 2022]). In patients undergoing noncardiac surgery, the risks and benefits of prasugrel should be evaluated between the surgeon and the cardiology team. Elective noncardiac surgery should not be performed in patients in whom dual antiplatelet therapy (DAPT) will need to be discontinued perioperatively within 30 days following bare metal stent placement or within 3 months of drug-eluting stent placement. In patients undergoing urgent noncardiac surgery during the first 4 to 6 weeks after BMS or DES placement, continue DAPT. In patients undergoing noncardiac surgery that requires discontinuation of prasugrel, hold for 7 days preoperatively, continue aspirin and restart prasugrel as soon as possible (eg, ≤24 hours) after surgery based on bleeding and thrombotic risks (ACC/AHA [Fleisher 2014]; ACC/AHA [Lawton 2022]; ACC/AHA [Levine 2016]; ACCP [Douketis 2022]).
Other warnings/precautions:
• Discontinuation of therapy: For patients who undergo percutaneous coronary intervention with stenting, premature interruption of therapy may result in increased risk of myocardial infarction, stent thrombosis, stroke, or death. If therapy must be held temporarily (eg, bleeding, surgery), restart as soon as possible unless the reason for discontinuation is a stroke or TIA where subsequent use is contraindicated. Duration of therapy is determined by the type of stent placed (bare metal or drug eluting), whether an acute coronary syndrome event was ongoing at the time of placement, as well as risks for bleeding and thrombosis (ACC/AHA [Lawton 2022]).
Excipient information presented when available (limited, particularly for generics); consult specific product labeling.
Tablet, Oral:
Effient: 5 mg, 10 mg
Generic: 5 mg, 10 mg
Yes
Tablets (Effient Oral)
5 mg (per each): $24.39
10 mg (per each): $24.39
Tablets (Prasugrel HCl Oral)
5 mg (per each): $16.51
10 mg (per each): $16.50 - $16.51
Disclaimer: A representative AWP (Average Wholesale Price) price or price range is provided as reference price only. A range is provided when more than one manufacturer's AWP price is available and uses the low and high price reported by the manufacturers to determine the range. The pricing data should be used for benchmarking purposes only, and as such should not be used alone to set or adjudicate any prices for reimbursement or purchasing functions or considered to be an exact price for a single product and/or manufacturer. Medi-Span expressly disclaims all warranties of any kind or nature, whether express or implied, and assumes no liability with respect to accuracy of price or price range data published in its solutions. In no event shall Medi-Span be liable for special, indirect, incidental, or consequential damages arising from use of price or price range data. Pricing data is updated monthly.
Excipient information presented when available (limited, particularly for generics); consult specific product labeling.
Tablet, Oral:
Generic: 10 mg
Oral: Administer without regard to meals. In an emergent primary PCI setting, crushing the tablets (using a commercially available syringe crusher) and mixing with 25 mL of water led to faster absorption and a quicker, more potent antiplatelet effect seen as early as 30 minutes (Ref). In addition, according to the manufacturer, tablets may be chewed and swallowed (bitter to taste) or crushed and mixed in food or liquid (eg, applesauce, juice, water) and immediately administered by mouth or gastric tube. Administration via an enteral tube that bypasses the acidic environment of the stomach may result in reduced bioavailability of prasugrel (data on file, Daiichi Sankyo-Lilly 2012).
An FDA-approved patient medication guide, which is available with the product information and at https://www.accessdata.fda.gov/drugsatfda_docs/label/2020/022307s018lbl.pdf#page=21, must be dispensed with this medication.
Acute coronary syndrome managed by percutaneous coronary intervention: To reduce the rate of thrombotic cardiovascular events (including stent thrombosis) in patients with acute coronary syndrome who are to be managed with percutaneous coronary intervention for unstable angina, non-ST-elevation myocardial infarction (MI), or ST-elevation MI.
Prasugrel may be confused with pravastatin, propranolol
Beers Criteria: Prasugrel is identified in the Beers Criteria as a potentially inappropriate medication to be used with caution, especially in patients 75 years and older due to increased risk of bleeding compared with clopidogrel; however, cardiovascular benefit in certain older adults may offset risk. Consider a lower dose (5 mg/day) if used in patients 75 years and older (Beers Criteria [AGS 2023]).
Substrate of CYP2B6 (Minor), CYP3A4 (Minor); Note: Assignment of Major/Minor substrate status based on clinically relevant drug interaction potential;
Note: Interacting drugs may not be individually listed below if they are part of a group interaction (eg, individual drugs within “CYP3A4 Inducers [Strong]” are NOT listed). For a complete list of drug interactions by individual drug name and detailed management recommendations, use the drug interactions program by clicking on the “Launch drug interactions program” link above.
Abrocitinib: Therapeutic Antiplatelets may increase antiplatelet effects of Abrocitinib. Management: Do not use antiplatelet drugs with abrocitinib during the first 3 months of abrocitinib therapy. The abrocitinib prescribing information lists this combination as contraindicated. This does not apply to low dose aspirin (81 mg/day or less). Risk X: Avoid
Acalabrutinib: May increase antiplatelet effects of Therapeutic Antiplatelets. Risk C: Monitor
Aducanumab: May increase antiplatelet effects of Therapeutic Antiplatelets. Risk C: Monitor
Agents with Antiplatelet Effects: May increase antiplatelet effects of Antiplatelet Agents (P2Y12 Inhibitors). Risk C: Monitor
Anagrelide: May increase antiplatelet effects of Therapeutic Antiplatelets. Risk C: Monitor
Anticoagulants (Miscellaneous Agents): Therapeutic Antiplatelets may increase anticoagulant effects of Anticoagulants (Miscellaneous Agents). Risk C: Monitor
Antiplatelet Agents (P2Y12 Inhibitors): Therapeutic Antiplatelets may increase antiplatelet effects of Antiplatelet Agents (P2Y12 Inhibitors). Risk C: Monitor
Cangrelor: May decrease antiplatelet effects of Prasugrel. More specifically, while the use of Cangrelor is expected to increase total platelet inhibition in patients who have previously received Prasugrel, Cangrelor is expected to decrease binding of Prasugrel metabolites to P2Y12 receptors and thus reduce the extent of irreversible platelet inhibition. Management: Avoid administration of prasugrel until cangrelor is discontinued. Risk D: Consider Therapy Modification
Caplacizumab: May increase antiplatelet effects of Therapeutic Antiplatelets. Management: Avoid this combination if possible. If coadministration is required, monitor closely for bleeding. Interrupt caplacizumab if clinically significant bleeding occurs and administer von Willebrand factor concentrate to rapidly correct hemostasis, if needed. Risk D: Consider Therapy Modification
Collagenase (Systemic): Therapeutic Antiplatelets may increase adverse/toxic effects of Collagenase (Systemic). Specifically, the risk of injection site bruising and or bleeding may be increased. Risk C: Monitor
Dabigatran Etexilate: Antiplatelet Agents (P2Y12 Inhibitors) may increase anticoagulant effects of Dabigatran Etexilate. Risk C: Monitor
Dasatinib: May increase antiplatelet effects of Therapeutic Antiplatelets. Risk C: Monitor
Deoxycholic Acid: May increase antiplatelet effects of Therapeutic Antiplatelets. Risk C: Monitor
Desirudin: Therapeutic Antiplatelets may increase anticoagulant effects of Desirudin. Risk C: Monitor
Diamorphine: May decrease antiplatelet effects of Antiplatelet Agents (P2Y12 Inhibitors). Diamorphine may decrease serum concentration of Antiplatelet Agents (P2Y12 Inhibitors). Risk C: Monitor
Direct Oral Anticoagulants (DOACs): Antiplatelet Agents (P2Y12 Inhibitors) may increase anticoagulant effects of Direct Oral Anticoagulants (DOACs). Risk C: Monitor
Donanemab: May increase antiplatelet effects of Therapeutic Antiplatelets. Risk C: Monitor
FentaNYL: May decrease antiplatelet effects of Antiplatelet Agents (P2Y12 Inhibitors). FentaNYL may decrease serum concentration of Antiplatelet Agents (P2Y12 Inhibitors). Risk C: Monitor
Fondaparinux: Antiplatelet Agents (P2Y12 Inhibitors) may increase anticoagulant effects of Fondaparinux. Management: Discontinue antiplatelet agents, such as P2Y12 inhibitors, prior to fondaparinux therapy, if possible. If co-administration is required use caution and monitor for bleeding. Risk D: Consider Therapy Modification
Glycoprotein IIb/IIIa Inhibitors: Therapeutic Antiplatelets may increase anticoagulant effects of Glycoprotein IIb/IIIa Inhibitors. Risk C: Monitor
Heparin: Antiplatelet Agents (P2Y12 Inhibitors) may increase anticoagulant effects of Heparin. Risk C: Monitor
Heparins (Low Molecular Weight): Antiplatelet Agents (P2Y12 Inhibitors) may increase anticoagulant effects of Heparins (Low Molecular Weight). Risk C: Monitor
Herbal Products with Anticoagulant/Antiplatelet Effects: May increase antiplatelet effects of Therapeutic Antiplatelets. Risk C: Monitor
Ibritumomab Tiuxetan: Therapeutic Antiplatelets may increase antiplatelet effects of Ibritumomab Tiuxetan. Risk C: Monitor
Ibrutinib: Therapeutic Antiplatelets may increase adverse/toxic effects of Ibrutinib. Specifically, the risks of bleeding and hemorrhage may be increased. Risk C: Monitor
Icosapent Ethyl: May increase antiplatelet effects of Therapeutic Antiplatelets. Risk C: Monitor
Inotersen: Therapeutic Antiplatelets may increase adverse/toxic effects of Inotersen. Specifically, the risk of bleeding may be increased. Risk C: Monitor
Lecanemab: May increase antiplatelet effects of Therapeutic Antiplatelets. Risk C: Monitor
Limaprost: May increase adverse/toxic effects of Therapeutic Antiplatelets. Specifically, the risk of bleeding may be increased. Risk C: Monitor
Lipid Emulsion (Fish Oil Based): May increase antiplatelet effects of Therapeutic Antiplatelets. Risk C: Monitor
Miscellaneous Antiplatelets: May increase antiplatelet effects of Therapeutic Antiplatelets. Risk C: Monitor
Morphine (Systemic): May decrease antiplatelet effects of Antiplatelet Agents (P2Y12 Inhibitors). Morphine (Systemic) may decrease serum concentration of Antiplatelet Agents (P2Y12 Inhibitors). Management: Consider alternative anti-ischemic/analgesic therapies (eg, beta-blockers, nitroglycerin) in patients with acute coronary syndromes treated with a P2Y12 inhibitor when possible. The risks associated with other opioids are unknown. Risk D: Consider Therapy Modification
Multivitamins/Fluoride (with ADE): May increase antiplatelet effects of Therapeutic Antiplatelets. Risk C: Monitor
Multivitamins/Minerals (with ADEK, Folate, Iron): May increase antiplatelet effects of Therapeutic Antiplatelets. Risk C: Monitor
Multivitamins/Minerals (with AE, No Iron): May increase antiplatelet effects of Therapeutic Antiplatelets. Risk C: Monitor
Obinutuzumab: Therapeutic Antiplatelets may increase adverse/toxic effects of Obinutuzumab. Specifically, the risk of bleeding may be increased. Management: Consider avoiding coadministration of obinutuzumab and therapeutic antiplatelets, especially during the first cycle of obinutuzumab therapy. Risk D: Consider Therapy Modification
Omega-3 Fatty Acids: May increase antiplatelet effects of Therapeutic Antiplatelets. Risk C: Monitor
Pentosan Polysulfate Sodium: Therapeutic Antiplatelets may increase adverse/toxic effects of Pentosan Polysulfate Sodium. Specifically, the risk of hemorrhage may be increased. Risk C: Monitor
Pirtobrutinib: May increase antiplatelet effects of Therapeutic Antiplatelets. Risk C: Monitor
Selumetinib: May increase antiplatelet effects of Therapeutic Antiplatelets. Risk C: Monitor
Telotristat Ethyl: May decrease active metabolite exposure of Prasugrel. Risk C: Monitor
Therapeutic Antiplatelets: May increase antiplatelet effects of Antiplatelet Agents (P2Y12 Inhibitors). Risk C: Monitor
Thrombolytic Agents: Therapeutic Antiplatelets may increase adverse/toxic effects of Thrombolytic Agents. Specifically, the risk of bleeding may be increased. Risk C: Monitor
Ticagrelor: Antiplatelet Agents (P2Y12 Inhibitors) may increase antiplatelet effects of Ticagrelor. Risk X: Avoid
Tipranavir: May increase antiplatelet effects of Therapeutic Antiplatelets. Risk C: Monitor
Vitamin E (Systemic): May increase antiplatelet effects of Therapeutic Antiplatelets. Risk C: Monitor
Vitamin K Antagonists: Antiplatelet Agents (P2Y12 Inhibitors) may increase anticoagulant effects of Vitamin K Antagonists. Risk C: Monitor
Volanesorsen: May increase antiplatelet effects of Therapeutic Antiplatelets. Risk C: Monitor
Zanubrutinib: May increase antiplatelet effects of Therapeutic Antiplatelets. Risk C: Monitor
Outcome data related to maternal use of prasugrel during pregnancy are limited (Pop 2020; Tello-Montoliu 2013).
It is not known if prasugrel is excreted in breast milk.
According to the manufacturer, the decision to breastfeed during therapy should consider the risk of infant exposure, the benefits of breastfeeding to the infant, and benefits of treatment to the mother.
Hemoglobin and hematocrit periodically.
Prasugrel, an inhibitor of platelet activation and aggregation, is a prodrug that is metabolized to both active (R-138727) and inactive metabolites. The active metabolite irreversibly blocks the P2Y12 component of ADP receptors on the platelet, which prevents activation of the GPIIb/IIIa receptor complex, thereby reducing platelet activation and aggregation
Onset of action: Inhibition of platelet aggregation (IPA): Dose dependent: 60 mg loading dose: <30 minutes; median time to reach ≥20% IPA: 30 minutes (Brandt 2007).
Peak effect: Time to maximal IPA: Dose-dependent: Note: Degree of IPA based on adenosine diphosphate (ADP) concentration used during light aggregometry: 60 mg loading dose: Occurs ~4 hours post administration; Mean IPA (ADP 5 micromole/L): ~84.1%; Mean IPA (ADP 20 micromole/L): ~78.8% (Brandt 2007).
Duration of effect: Platelet aggregation gradually returns to baseline values over 5 to 9 days after discontinuation; reflective of new platelet production.
Absorption: Rapid; ≥79%.
Distribution: Active metabolite: Vd: 44 to 68 L.
Protein binding: Active metabolite: ~98%.
Metabolism: Rapid intestinal and serum metabolism via esterase-mediated hydrolysis to a thiolactone intermediate (inactive), which is then converted, via CYP450-mediated (primarily CYP3A4 and CYP2B6) oxidation, to an active metabolite (R-138727) (Farid 2007; Riley 2008).
Half-life elimination: Active metabolite: ~7 hours (range 2 to 15 hours).
Time to peak, plasma: Active metabolite: ~30 minutes; With high-fat/high-calorie meal: 1.5 hours.
Excretion: Urine (~68% inactive metabolites); feces (27% inactive metabolites).
Altered kidney function: In patients with ESRD, both Cmax and AUC0-t last of the active metabolite were approximately half that in healthy patients and in patients with moderate renal impairment.
Older adult: The AUC of active metabolite was 19% higher in patients 75 years and older than in patients younger than 75 years.
Race/ethnicity: The AUC of active metabolite was approximately 19% higher in Chinese, Japanese, and Korean subjects than in white subjects.
Body weight: The AUC of the active metabolite is approximately 30% to 40% higher in subjects with a body weight of less than 60 kg compared to those weighing 60 kg or more.