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warnings and cautions
5 WARNINGS AND PRECAUTIONS Do not abruptly lower the dose or withdraw dosing. All dosing initiation and changes should be closely monitored. (5.2, 5.3) 5.1 Dose Initiation Epoprostenol for injection is a potent pulmonary and systemic vasodilator. Initiate epoprostenol for injection in a setting with adequate personnel and equipment for physiologic monitoring and emergency care. Dose initiation has been performed during right heart catheterization and without cardiac catheterization. During dose initiation, asymptomatic increases in pulmonary artery pressure coincident with increases in cardiac output occurred rarely. In such cases, consider dose reduction, but such an increase does not imply that chronic treatment is contraindicated. 5.2 Chronic Use and Dose Adjustment During chronic use, deliver epoprostenol for injection continuously on an ambulatory basis through a permanent indwelling central venous catheter. Unless contraindicated, administer anticoagulant therapy to patients receiving epoprostenol for injection to reduce the risk of pulmonary thromboembolism or systemic embolism through a patent foramen ovale. To reduce the risk of infection, use aseptic technique in the reconstitution and administration of epoprostenol for injection and in routine catheter care. Because epoprostenol is metabolized rapidly, even brief interruptions in the delivery of epoprostenol for injection may result in symptoms associated with rebound pulmonary hypertension including dyspnea, dizziness, and asthenia. Intravenous therapy with epoprostenol for injection will likely be needed for prolonged periods, possibly years, so consider the patient’s capacity to accept and care for a permanent intravenous catheter and infusion pump. Based on clinical trials, the acute hemodynamic response (reduction in pulmonary artery resistance) to epoprostenol did not correlate well with improvement in exercise tolerance or survival during chronic use of epoprostenol. Adjust dosage of epoprostenol for injection during chronic use at the first sign of recurrence or worsening of symptoms attributable to pulmonary hypertension or the occurrence of adverse events associated with epoprostenol [see Dosage and Administration (2.2)] . Following dosage adjustments, monitor standing and supine blood pressure and heart rate closely for several hours. 5.3 Withdrawal Effects Abrupt withdrawal (includi...
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adverse reactions
6 ADVERSE REACTIONS Most common adverse reactions during: Dose Initiation and Escalation: Nausea, vomiting, headache, hypotension, flushing, chest pain, anxiety, dizziness, bradycardia, dyspnea, abdominal pain, musculoskeletal pain, and tachycardia (6.1) Chronic Dosing: Headache, jaw pain, flushing, diarrhea, nausea and vomiting, flu-like symptoms, and anxiety/nervousness (6.1) To report SUSPECTED ADVERSE REACTIONS, contact Sun Pharmaceutical Industries, Inc. at 1-800-818-4555 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. 6.1 Clinical Trials 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. During clinical trials, adverse events were classified as follows: (1) adverse events during dose initiation and escalation, (2) adverse events during chronic dosing, and (3) adverse events associated with the drug delivery system. Adverse Events during Dose Initiation and Escalation During early clinical trials, epoprostenol was increased in 2-ng/kg/min increments until the patients developed symptomatic intolerance. The most common adverse events and the adverse events that limited further increases in dose were generally related to vasodilation, the major pharmacologic effect of epoprostenol. The most common dose-limiting adverse events (occurring in > 1% of patients) were nausea, vomiting, headache, hypotension, and flushing, but also include chest pain, anxiety, dizziness, bradycardia, dyspnea, abdominal pain, musculoskeletal pain, and tachycardia. Table 8 lists the adverse events reported during dose initiation and escalation in decreasing order of frequency. Table 8: Adverse Events during Dose Initiation and Escalation Adverse Events Occurring in ≥1% of Patients Epoprostenol (n = 391) Flushing 58% Headache 49% Nausea/vomiting 32% Hypotension 16% Anxiety, nervousness, agitation 11% Chest pain 11% Dizziness 8% Bradycardia 5% Abdominal pain 5% Musculoskeletal pain 3% Dyspnea 2% Back pain 2% Sweating 1% Dyspepsia 1% Hypesthesia/paresthesia 1% Tachycardia 1% Adverse Events during Chronic Administration: Interpretation of adverse events is complicated by the clinical features of PAH, which are similar to some of the pharmacologic effects of ep...