Effient Side Effects Center

Last updated on RxList: 1/8/2021
Effient Side Effects Center

What Is Effient?

Effient (prasugrel) is an antiplatelet drug that prevents the platelets in the bloodstream from aggregating and forming blood clots, used to prevent blood clots in people with acute coronary syndrome who are undergoing a procedure after a recent heart attack or stroke, and in people with certain disorders of the heart or blood vessels.

What Are Side Effects of Effient?

Side effects of Effient include:

  • an increased tendency for bleeding,
  • headache,
  • dizziness,
  • back pain,
  • minor chest pain,
  • tired feeling,
  • fatigue,
  • nausea,
  • cough,
  • high or low blood pressure (hypertension or hypotension),
  • shortness of breath,
  • slow heart rate,
  • rash,
  • fever,
  • swelling or pain in the extremities, and
  • diarrhea.

Dosage for Effient

Effient treatment is started as a single 60-mg oral loading dose and then continued at 10 mg orally once daily. Patients taking Effient should also take aspirin (75 mg to 325 mg) daily.

What Drugs, Substances, or Supplements Interact with Effient?

Effient may interact with NSAIDs (nonsteroidal anti-inflammatory drugs) or warfarin. Tell your doctor all medications and supplements you use.

Effient During Pregnancy and Breastfeeding

There are no adequate and well-controlled studies of Effient use in pregnant women, although studies in animals did not show any evidence of harm to the developing fetus. Effient should be used during pregnancy only if the potential benefit to the mother justifies the potential risk to the fetus. It is unknown whether prasugrel is excreted in human milk.

Additional Information

Our Effient Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.


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Get emergency medical help if you have signs of an allergic reaction: hives; dizziness, chest pain, difficulty breathing; swelling of your face, lips, tongue, or throat.

Prasugrel increases your risk of bleeding, which can be severe or life-threatening.

Call your doctor at once if you have:

  • a light-headed feeling, like you might pass out;
  • any bleeding that will not stop;
  • pink or brown urine;
  • signs of a serious blood-clotting problem--pale skin, purple spots under your skin or on your mouth, fever, fast heart rate, weakness, stomach pain, trouble breathing, jaundice (yellowing of the skin or eyes);
  • signs of stomach bleeding--bloody or tarry stools, coughing up blood or vomit that looks like coffee grounds; or
  • signs of a stroke--sudden numbness or weakness (especially on one side of the body), sudden severe headache, slurred speech, problems with vision or balance.

The risk of bleeding is higher in older adults.

Common side effects may include:

  • nosebleeds; or
  • easy bruising or bleeding.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.


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The following serious adverse reactions are also discussed elsewhere in the labeling:

Clinical Trials Experience

Safety in patients with ACS undergoing PCI was evaluated in a clopidogrel-controlled study, TRITON-TIMI 38, in which 6741 patients were treated with Effient (60 mg loading dose and 10 mg once daily) for a median of 14.5 months (5802 patients were treated for over 6 months; 4136 patients were treated for more than 1 year). The population treated with Effient was 27 to 96 years of age, 25% female, and 92% Caucasian. All patients in the TRITON-TIMI 38 study were to receive aspirin. The dose of clopidogrel in this study was a 300 mg loading dose and 75 mg once daily.

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared with the rates observed in other clinical trials of another drug and may not reflect the rates observed in practice.

Drug Discontinuation

The rate of study drug discontinuation because of adverse reactions was 7.2% for Effient and 6.3% for clopidogrel. Bleeding was the most common adverse reaction leading to study drug discontinuation for both drugs (2.5% for Effient and 1.4% for clopidogrel).


Bleeding Unrelated to CABG Surgery

In TRITON-TIMI 38, overall rates of TIMI Major or Minor bleeding adverse reactions unrelated to coronary artery bypass graft surgery (CABG) were significantly higher on Effient than on clopidogrel, as shown in Table 1.

Table 1: Non-CABG-Related Bleeding* (TRITON-TIMI 38)

TIMI Major or Minor bleeding4.53.4
TIMI Major bleeding†2.21.7
    Symptomatic intracranial hemorrhage (ICH)0.30.3
    Requiring inotropes0.30.1
    Requiring surgical intervention0.30.3
    Requiring transfusion (≥4 units)0.70.5
TIMI Minor bleeding2.41.9
* Patients may be counted in more than one row.

Figure 1 demonstrates non-CABG-related TIMI Major or Minor bleeding. The bleeding rate is highest initially, as shown in Figure 1 (inset: Days 0 to 7) [see WARNINGS AND PRECAUTIONS].

Bleeding by Weight and Age

In TRITON-TIMI 38, non-CABG-related TIMI Major or Minor bleeding rates in patients with the risk factors of age ≥75 years and weight <60 kg are shown in Table 2.

Table 2: Bleeding Rates for Non-CABG-Related Bleeding by Weight and Age (TRITON-TIMI 38)

Weight <60 kg (N=308 Effient, N=356 clopidogrel)
Weight ≥60 kg (N=6373 Effient, N=6299 clopidogrel)
Age <75 years (N=5850 Effient, N=5822 clopidogrel)
Age ≥75 years (N=891 Effient, N=894 clopidogrel)
* 10 mg Effient maintenance dose
75 mg clopidogrel maintenance dose

Bleeding Related to CABG

In TRITON-TIMI 38, 437 patients who received a thienopyridine underwent CABG during the course of the study. The rate of CABG-related TIMI Major or Minor bleeding was 14.1% for the Effient group and 4.5% in the clopidogrel group (see Table 3). The higher risk for bleeding adverse reactions in patients treated with Effient persisted up to 7 days from the most recent dose of study drug.

Table 3: CABG-Related Bleeding* (TRITON-TIMI 38)

Effient (%)
Clopidogrel (%)
TIMI Major or Minor bleeding14.14.5
TIMI Major bleeding11.33.6
    Transfusion of ≥5 units6.62.2
    Intracranial hemorrhage00
TIMI Minor bleeding2.80.3
* Patients may be counted in more than one row.

Bleeding Reported as Adverse Reactions

Hemorrhagic events reported as adverse reactions in TRITON-TIMI 38 were, for Effient and clopidogrel, respectively: epistaxis (6.2%, 3.3%), gastrointestinal hemorrhage (1.5%, 1.0%), hemoptysis (0.6%, 0.5%), subcutaneous hematoma (0.5%, 0.2%), post-procedural hemorrhage (0.5%, 0.2%), retroperitoneal hemorrhage (0.3%, 0.2%), pericardial effusion/hemorrhage/tamponade (0.3%, 0.2%), and retinal hemorrhage (0.0%, 0.1%).


During TRITON-TIMI 38, newly diagnosed malignancies were reported in 1.6% and 1.2% of patients treated with prasugrel and clopidogrel, respectively. The sites contributing to the differences were primarily colon and lung. In another Phase 3 clinical study of ACS patients not undergoing PCI, in which data for malignancies were prospectively collected, newly diagnosed malignancies were reported in 1.8% and 1.7% of patients treated with prasugrel and clopidogrel, respectively. The site of malignancies was balanced between treatment groups except for colorectal malignancies. The rates of colorectal malignancies were 0.3% prasugrel, 0.1% clopidogrel and most were detected during investigation of GI bleed or anemia. It is unclear if these observations are causally related, are the result of increased detection because of bleeding, or are random occurrences.

Other Adverse Events

In TRITON-TIMI 38, common and other important nonhemorrhagic adverse events were, for Effient and clopidogrel, respectively: severe thrombocytopenia (0.06%, 0.04%), anemia (2.2%, 2.0%), abnormal hepatic function (0.22%, 0.27%), allergic reactions (0.36%, 0.36%), and angioedema (0.06%, 0.04%). Table 4 summarizes the adverse events reported by at least 2.5% of patients.

Table 4: Non-Hemorrhagic Treatment Emergent Adverse Events Reported by at Least 2.5% of Patients in Either Group

Effient (%)
Clopidogrel (%)
Back pain5.04.5
Noncardiac chest pain3.13.5
Atrial fibrillation2.93.1
Leukopenia (<4 x 109 WBC*/L)2.83.5
Peripheral edema2.73.0
Pain in extremity2.62.6
* WBC = white blood cell

Postmarketing Experience

The following adverse reactions have been identified during post-approval use of Effient. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.

Blood and lymphatic system disordersthrombocytopenia, thrombotic thrombocytopenic purpura (TTP) [see WARNINGS AND PRECAUTIONS and Patient Counseling Information]

Immune system disorders — hypersensitivity reactions including anaphylaxis [see CONTRAINDICATIONS]

Read the entire FDA prescribing information for Effient (Prasugrel Tablets)


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© Effient Patient Information is supplied by Cerner Multum, Inc. and Effient Consumer information is supplied by First Databank, Inc., used under license and subject to their respective copyrights.

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