October 10, 2015
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Side Effects


The following serious adverse reactions associated with PROMACTA are described in other sections.

  • Hepatic Decompensation in Patients with Chronic Hepatitis C [see WARNINGS AND PRECAUTIONS]
  • Hepatotoxicity [see WARNINGS AND PRECAUTIONS]
  • Thrombotic/Thromboembolic Complications [see WARNINGS AND PRECAUTIONS]

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 with rates in the clinical trials of another drug and may not reflect the rates observed in practice.

Chronic Immune (Idiopathic) Thrombocytopenia

Adults: In clinical trials, hemorrhage was the most common serious adverse reaction and most hemorrhagic reactions followed discontinuation of PROMACTA. Other serious adverse reactions included thrombotic/thromboembolic complications [see WARNINGS AND PRECAUTIONS]. The data described below reflect exposure of PROMACTA to 446 patients with chronic ITP aged 18 to 85 years, of whom 65% were female, across the ITP clinical development program including three placebo-controlled trials. PROMACTA was administered to 277 patients for at least 6 months and 202 patients for at least 1 year.

Table 4 presents the most common adverse drug reactions (experienced by greater than or equal to 3% of patients receiving PROMACTA) from the three placebo-controlled trials, with a higher incidence in PROMACTA versus placebo.

Table 4: Adverse Reactions ( ≥ 3%) from Three Placebo-controlled Trials in Adults with Chronic Immune (Idiopathic) Thrombocytopenia

Adverse Reaction PROMACTA 50 mg
n = 241 (%)
n = 128 (%)
Nausea 9 3
Diarrhea 9 7
Upper respiratory tract infection 7 6
Vomiting 6 < 1
Increased ALT 5 3
Myalgia 5 2
Urinary tract infection 5 3
Oropharyngeal pain 4 3
Increased AST 4 2
Pharyngitis 4 2
Back pain 3 2
Influenza 3 2
Paresthesia 3 2
Rash 3 2

In the three controlled clinical chronic ITP trials, alopecia, musculoskeletal pain, blood alkaline phosphatase increased, and dry mouth were the adverse reactions reported in 2% of patients treated with PROMACTA and in no patients who received placebo.

Among 299 patients with chronic ITP who received PROMACTA in the single-arm extension trial, the adverse reactions occurred in a pattern similar to that seen in the placebocontrolled trials. Table 5 presents the most common treatment-related adverse reactions (experienced by greater than or equal to 3% of patients receiving PROMACTA) from the extension trial.

Table 5: Treatment-related Adverse Reactions ( ≥ 3%) from Extension Trial in Adults with Chronic Immune (Idiopathic) Thrombocytopenia

Adverse Reaction PROMACTA 50 mg
n = 299 (%)
Headache 10
Hyperbilirubinemia 6
ALT increased 6
Cataract 5
AST increased 4
Fatigue 4
Nausea 4

In the three controlled chronic ITP trials, serum liver test abnormalities (predominantly Grade 2 or less in severity) were reported in 11% and 7% of patients for PROMACTA and placebo, respectively. Four patients (1%) treated with PROMACTA and three patients in the placebo group (2%) discontinued treatment due to hepatobiliary laboratory abnormalities. Seven of the patients treated with PROMACTA in the controlled trials with hepatobiliary laboratory abnormalities were re-exposed to PROMACTA in the extension trial. Six of these patients again experienced liver test abnormalities (predominantly Grade 1) resulting in discontinuation of PROMACTA in one patient. In the extension chronic ITP trial, one additional patient had PROMACTA discontinued due to liver test abnormalities (less than or equal to Grade 3).

In a placebo-controlled trial of PROMACTA in patients with chronic liver disease and thrombocytopenia not related to ITP, six patients treated with PROMACTA and one patient in the placebo group developed portal vein thromboses [see WARNINGS AND PRECAUTIONS].

Pediatric Patients: The data described below reflect median exposure to PROMACTA of 91 days for 107 pediatric patients (aged 1 to 17 years) with chronic ITP, of whom 53% were female, across the randomized phase of two placebo-controlled trials.

Table 6 presents the most common adverse drug reactions (experienced by greater than or equal to 3% of pediatric patients 1 year and older receiving PROMACTA) across the two placebo-controlled trials, with a higher incidence for PROMACTA versus placebo.

Table 6: Adverse Reactions ( ≥ 3%) with a Higher Incidence for PROMACTA versus Placebo from Two Placebo-controlled Trials in Pediatric Patients 1 Year and Older with Chronic Immune (Idiopathic) Thrombocytopenia

Adverse Reaction PROMACTA
n = 107 (%)
n = 50 (%)
Upper respiratory tract infection 17 6
Nasopharyngitis 12 4
Cough 9 0
Diarrhea 9 2
Pyrexia 9 8
Rhinitis 9 6
Abdominal pain 8 4
Oropharyngeal pain 8 2
Toothache 6 0
ALT increaseda 6 0
Rash 5 2
AST increased 4 0
Rhinorrhea 4 0
a Includes adverse reactions or laboratory abnormalities > 3 x ULN.

Chronic Hepatitis C-associated Thrombocytopenia

In the two placebo-controlled trials, 955 patients with chronic hepatitis C-associated thrombocytopenia received PROMACTA. Table 7 presents the most common adverse drug reactions (experienced by greater than or equal to 10% of patients receiving PROMACTA compared with placebo).

Table 7: Adverse Reactions ( ≥ 10% and Greater than Placebo) from Two Placebocontrolled Trials in Adults with Chronic Hepatitis C

Adverse Reaction PROMACTA + Peginterferon/ Ribavirin
n = 955 (%)
Placebo + Peginterferon/ Ribavirin
n = 484 (%)
Anemia 40 35
Pyrexia 30 24
Fatigue 28 23
Headache 21 20
Nausea 19 14
Diarrhea 19 11
Decreased appetite 18 14
Influenza-like illness 18 16
Asthenia 16 13
Insomnia 16 15
Cough 15 12
Pruritus 15 13
Chills 14 9
Myalgia 12 10
Alopecia 10 6
Peripheral edema 10 5

In the two controlled clinical trials in patients with chronic hepatitis C, hyperbilirubinemia was reported in 8% of patients receiving PROMACTA compared with 3% for placebo. Total bilirubin greater than or equal to 1.5 x ULN was reported in 76% and 50% of patients receiving PROMACTA and placebo, respectively. ALT or AST greater than or equal to 3 x ULN was reported in 34% and 38% of patients for PROMACTA and placebo, respectively.

Severe Aplastic Anemia

In the single-arm, open-label trial, 43 patients with severe aplastic anemia received PROMACTA. Eleven patients (26%) were treated for greater than 6 months and 7 patients (16%) were treated for greater than 1 year. The most common adverse reactions (greater than or equal to 20%) were nausea, fatigue, cough, diarrhea, and headache.

Table 8: Adverse Reactions ( ≥ 10%) from One Open-label Trial in Adults with Severe Aplastic Anemia

Adverse Reaction PROMACTA
(n = 43) (%)
Nausea 33
Fatigue 28
Cough 23
Diarrhea 21
Headache 21
Pain in extremity 19
Dyspnea 14
Pyrexia 14
Dizziness 14
Oropharyngeal pain 14
Febrile neutropenia 14
Abdominal pain 12
Ecchymosis 12
Muscle spasms 12
Transaminases increased 12
Arthralgia 12
Rhinorrhea 12

In this trial, patients had bone marrow aspirates evaluated for cytogenetic abnormalities. Eight patients had a new cytogenetic abnormality reported on therapy, including 5 patients who had complex changes in chromosome 7.

Postmarketing Experience

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

Vascular Disorders

Thrombotic microangiopathy with acute renal failure.

Read the Promacta (eltrombopag tablets) Side Effects Center for a complete guide to possible side effects


In vitro, CYP1A2, CYP2C8, UGT1A1, and UGT1A3 are involved in the metabolism of eltrombopag. In vitro, eltrombopag inhibits the following metabolic or transporter systems: CYP2C8, CYP2C9, UGT1A1, UGT1A3, UGT1A4, UGT1A6, UGT1A9, UGT2B7, UGT2B15, OATP1B1, and breast cancer resistance protein (BCRP) [see CLINICAL PHARMACOLOGY].

Polyvalent Cations (Chelation)

Eltrombopag chelates polyvalent cations (such as iron, calcium, aluminum, magnesium, selenium, and zinc) in foods, mineral supplements, and antacids. In a clinical trial, administration of PROMACTA with a polyvalent cation-containing antacid decreased plasma eltrombopag systemic exposure by approximately 70% [see CLINICAL PHARMACOLOGY].

Take PROMACTA at least 2 hours before or 4 hours after any medications or products containing polyvalent cations such as antacids, dairy products, and mineral supplements to avoid significant reduction in absorption of PROMACTA due to chelation [see DOSAGE AND ADMINISTRATION, CLINICAL PHARMACOLOGY].


Coadministration of PROMACTA with the OATP1B1 and BCRP substrate, rosuvastatin, to healthy adult subjects increased plasma rosuvastatin AUC0-∞ by 55% and Cmax by 103% [see CLINICAL PHARMACOLOGY].

Use caution when concomitantly administering PROMACTA and drugs that are substrates of OATP1B1 (e.g., atorvastatin, bosentan, ezetimibe, fluvastatin, glyburide, olmesartan, pitavastatin, pravastatin, rosuvastatin, repaglinide, rifampin, simvastatin acid, SN-38 [active metabolite of irinotecan], valsartan) or BCRP (e.g., imatinib, irinotecan, lapatinib, methotrexate, mitoxantrone, rosuvastatin, sulfasalazine, topotecan). Monitor patients closely for signs and symptoms of excessive exposure to the drugs that are substrates of OATP1B1 or BCRP and consider reduction of the dose of these drugs, if appropriate. In clinical trials with PROMACTA, a dose reduction of rosuvastatin by 50% was recommended.

Protease Inhibitors

HIV Protease Inhibitors

In a drug interaction trial, coadministration of PROMACTA with lopinavir/ritonavir (LPV/RTV) decreased plasma eltrombopag exposure by 17% [see CLINICAL PHARMACOLOGY]. No dose adjustment is recommended when PROMACTA is coadministered with LPV/RTV. Drug interactions with other HIV protease inhibitors have not been evaluated.

Hepatitis C Virus (HCV) Protease Inhibitors

Coadministration of PROMACTA with either boceprevir or telaprevir did not affect eltrombopag or protease inhibitor exposure significantly [see CLINICAL PHARMACOLOGY]. No dose adjustments are recommended. Drug interactions with other HCV protease inhibitors have not been evaluated.

Peginterferon alfa-2a/b Therapy

Coadministration of peginterferon alfa-2a (PEGASYS®) or -2b (PEGINTRON®) did not affect eltrombopag exposure in two randomized, double-blind, placebo-controlled trials with adult patients with chronic hepatitis C [see CLINICAL PHARMACOLOGY].

Read the Promacta Drug Interactions Center for a complete guide to possible interactions

Last reviewed on RxList: 9/2/2015
This monograph has been modified to include the generic and brand name in many instances.

Side Effects

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