TAVALISSE SIDE EFFECTS
- Generic Name: fostamatinib disodium hexahydrate tablets, for oral use
- Brand Name: Tavalisse
- Drug Class: SYK Inhibitors
SIDE EFFECTS
The following clinically important adverse reactions, that can become serious are described elsewhere in the labeling:
- Hypertension
- Hepatotoxicity
- Diarrhea
- Neutropenia
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.
TAVALISSE was studied in two randomized, double-blind, placebo-controlled trials that were identical in design. The data described below reflect exposure to TAVALISSE in 102 patients with chronic ITP who had received one or more prior ITP treatment(s). Groups were stratified with respect to splenectomy and severity of thrombocytopenia. Patients randomized to the TAVALISSE arm received 100 mg orally twice daily. Based upon platelet count and tolerability, if a patient’s platelet count did not increase to at least 50 x 109/L, the TAVALISSE dose could be increased to 150 mg twice daily after one month. In the placebo controlled studies, the median duration of TAVALISSE exposure in these studies was 86 days (range 8 to 183).
In the ITP double-blind studies, serious adverse drug reactions were febrile neutropenia, diarrhea, pneumonia, and hypertensive crisis, which each occurred in 1% of patients receiving TAVALISSE. In addition, severe adverse reactions observed in patients receiving TAVALISSE included dyspnea and hypertension (both 2%); and neutropenia, arthralgia, chest pain, diarrhea, dizziness, nephrolithiasis, pain in extremity, toothache, syncope and hypoxia (all 1%). Table 3 presents the common adverse reactions from these studies.
Table 1: Incidence of Common (≥ 5%) Adverse Reactions from Double-Blind Clinical Studies (FIT 1 and FIT 2)
| Adverse Reaction | TAVALISSE (N=102) |
Placebo (N=48) |
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| Mild % |
Moderate % |
Severe % |
TOTAL % |
Mild % |
Moderate % |
Severe % |
TOTAL % |
|
| Diarrhea1 | 21 | 10 | 1 | 31 | 13 | 2 | 0 | 15 |
| Hypertension2 | 17 | 9 | 2 | 28 | 10 | 0 | 2 | 13 |
| Nausea | 16 | 3 | 0 | 19 | 8 | 0 | 0 | 8 |
| Dizziness | 8 | 2 | 1 | 11 | 6 | 2 | 0 | 8 |
| ALT increased | 5 | 6 | 0 | 11 | 0 | 0 | 0 | 0 |
| AST increased | 5 | 4 | 0 | 9 | 0 | 0 | 0 | 0 |
| Respiratory infection3 | 7 | 4 | 0 | 11 | 6 | 0 | 0 | 6 |
| Rash4 | 8 | 1 | 0 | 9 | 2 | 0 | 0 | 2 |
| Abdominal pain5 | 5 | 1 | 0 | 6 | 2 | 0 | 0 | 2 |
| Fatigue | 4 | 2 | 0 | 6 | 0 | 2 | 0 | 2 |
| Chest pain | 2 | 3 | 1 | 6 | 2 | 0 | 0 | 2 |
| Neutropenia6 | 3 | 2 | 1 | 6 | 0 | 0 | 0 | 0 |
| ALT = Alanine aminotransferase AST = Aspartate aminotransferase Note: Common adverse reactions defined as all adverse reactions occurring at a rate of ≥ 5% of patients in the TAVALISSE group and greater than placebo rate. 1 Includes diarrhea and frequent bowel movement. 2 Includes hypertension, blood pressure (BP) increased, BP diastolic abnormal, and BP diastolic increased. 3 Includes upper respiratory tract infection, respiratory tract infection, lower respiratory tract infection, and viral upper respiratory tract infection. 4 Includes rash, rash erythematous and rash macular. 5 Includes abdominal pain, and abdominal pain upper. 6 Includes neutropenia and neutrophil count decreased. |
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Table 2: Elevations in Hepatic Transaminases During Placebo-Controlled Clinical Studies
| Enzyme | Maximum Level of Elevation | Number of Patients (%) | |
| TAVALISSE, (N=102) |
Placebo (N=48) |
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| Alanine aminotransferase (ALT) and/or Aspartate aminotransferase (AST) | >3 and ≤5 x ULN | 3 (3) | 0 |
| >5 and ≤10 x ULN | 5 (5) | 0 | |
| ≥10 x ULN | 1 (1) | 0 | |
SRC: NLM .