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The following adverse reactions are discussed in greater detail in other sections of the labeling:

  • Cardiovascular Toxicity [see WARNINGS AND PRECAUTIONS]
  • Bleeding Risk [see WARNINGS AND PRECAUTIONS]
  • Pulmonary Toxicity [see WARNINGS AND PRECAUTIONS]

Clinical Trial Experience

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

Clinical Studies in Adult Patients

In three single-arm clinical studies, 942 patients [see Clinical Trials] diagnosed with myeloproliferative neoplasms of varying etiology (ET: 551; PV: 117; OMPN: 274) were exposed to anagrelide with a mean duration of approximately 65 weeks. Serious adverse reactions reported in these patients included the following: congestive heart failure, myocardial infarction, cardiomyopathy, cardiomegaly, complete heart block, atrial fibrillation, cerebrovascular accident, pericardial effusion [see WARNINGS AND PRECAUTIONS], pleural effusion, pulmonary infiltrates, pulmonary fibrosis, pulmonary hypertension, and pancreatitis. Of the 942 patients treated with anagrelide, 161 (17%) were discontinued from the study because of adverse reactions or abnormal laboratory test results. The most common adverse reactions for treatment discontinuation were headache, diarrhea, edema, palpitations, and abdominal pain.

The most frequently reported adverse reactions to anagrelide (in 5% or greater of 942 patients with myeloproliferative neoplasms) in clinical trials were listed in Table 1.

Table 1 : Adverse Reactions Reported in Clinical Studies in at least 5% of Patients

Adverse reactions AGRYLIN
(N=942) (%)
Cardiac Disorder
Palpitations 26%
Tachycardia 8%
Chest Pain 8%
General disorders and administration site conditions
Asthenia 23%
Edema 21%
Pain 15%
Fever 9%
Peripheral edema 9%
Malaise 6%
Gastrointestinal disorders
Diarrhea 26%
Nausea 17%
Abdominal Pain 16%
Vomiting 10%
Flatulence 10%
Anorexia 8%
Dyspepsia 5%
Respiratory, thoracic and mediastinal disorders
Dyspnea 12%
Cough 6%
Skin and subcutaneous tissue disorders
Rash 8%
Pruritus 6%
Musculoskeletal and connective tissue disorders
Back Pain 6%
Nervous system disorders
Headache 44%
Dizziness 15%
Paresthesia 6%

Adverse Reactions (frequency 1% to < 5%) Included

General disorders and administration site conditions: Flu symptoms, chills.

Cardiac Disorders: Arrhythmia, angina pectoris, heart failure, syncope.

Vascular disorders: Hemorrhage, hypertension, postural hypotension, vasodilatation.

Gastrointestinal disorders: Constipation, gastrointestinal hemorrhage, gastritis.

Blood and lymphatic system disorders: Anemia, thrombocytopenia, ecchymosis.

Hepatobiliary disorders: Elevated liver enzymes.

Musculoskeletal and connective tissue disorders: Arthralgia, myalgia.

Psychiatric disorders: Depression, confusion, nervousness.

Nervous system disorders: Somnolence, insomnia, amnesia, migraine headache.

Respiratory, thoracic and mediastinal disorders: Epistaxis, pneumonia.

Skin and subcutaneous tissue disorders: Alopecia.

Eye disorders: Abnormal vision, diplopia.

Ear and labyrinth disorders: Tinnitus

Renal and urinary disorders: Hematuria, renal failure.

Clinical Study in Pediatric Patients

The frequency of adverse events observed in pediatric patients was similar to adult patients. The most common adverse events observed in pediatric patients were fever, epistaxis, headache, and fatigue during the 3-month anagrelide treatment in the study. Episodes of increased pulse and decreased systolic or diastolic blood pressure beyond the normal ranges in the absence of clinical symptoms were observed. Adverse events that had been reported in these pediatric patients prior to the study and were considered to be related to anagrelide treatment based on retrospective review were; palpitations, headache, nausea, vomiting, abdominal pain, back pain, anorexia, fatigue, and muscle cramps.

Postmarketing Experience

The following adverse reactions have been identified during post-marketing use of AGRYLIN. 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. Cases of torsades de pointes, ventricular tachycardia, interstitial lung diseases (including allergic alveolitis, eosinophilic pneumonia and interstitial pneumonitis) [see WARNINGS AND PRECAUTIONS], tubulointerstitial nephritis and clinically significant hepatotoxicity (including symptomatic ALT and AST elevations and elevations greater than three times the ULN) have been reported.

Other adverse events in pediatric patients reported in spontaneous reports and literature reviews include anemia, cutaneous photosensitivity and elevated leukocyte count.