In a controlled study in pediatric patients age 4 years to <16 years, statistically significant decreases in WBC and neutrophil counts were seen in levetiracetam-treated patients, as compared to placebo. The mean decreases from baseline in the levetiracetam-treated group were -0.4 × 109/L and -0.3 × 109/L, respectively, whereas there were small increases in the placebo group. Mean relative lymphocyte counts increased by 1.7% in levetiracetam-treated patients, compared to a decrease of 4% in placebo-treated patients (statistically significant). More levetiracetam-treated patients had a possibly clinically significant abnormally low WBC value (3% of levetiracetam-treated patients versus 0% of placebo-treated patients); however, there was no apparent difference between treatment groups with respect to neutrophil count (5% on levetiracetam versus 4.2% on placebo). No patient was discontinued because of low WBC or neutrophil count.In a randomized, double-blind, placebo-controlled study to assess the neurocognitive and behavioral effects of an oral formulation of levetiracetam as adjunctive therapy in pediatric patients (4 to 16 years of age), five patients (8.6%) in the levetiracetam-treated group and two patients (6.1%) in the placebo-treated group had high eosinophil count values that were possibly clinically significant (≥10% or ≥0.7×109/L).
In a randomized, placebo-controlled study in patients 1 month to <4 years of age using an oral formulation of levetiracetam, a significantly higher risk of increased diastolic blood pressure was observed in the levetiracetam-treated patients (17%), compared to placebo-treated patients (2%). There was no overall difference in mean diastolic blood pressure between the treatment groups. This disparity between the levetiracetam and placebo treatment groups was not observed in the studies of older children or in adults.
Monitor patients 1 month to < 4 years of age for increases in diastolic blood pressure.
Physiological changes may gradually decrease plasma levels of levetiracetam throughout pregnancy. This decrease is more pronounced during the third trimester. It is recommended that patients be monitored carefully during pregnancy. Close monitoring should continue through the postpartum period especially if the dose was changed during pregnancy.
The following adverse reactions are discussed in more details in other sections of labeling:
- Behavioral Abnormalities and Psychotic Symptoms [see Warnings and Precautions (5.1)]
- Somnolence and Fatigue [see Warnings and Precautions (5.2)]
- Anaphylaxis and Angioedema [see Warnings and Precautions (5.3)]
- Serious Dermatological Reactions [see Warnings and Precautions (5.4)]
- Coordination Difficulties [see Warnings and Precautions (5.5)]
- Hematologic Abnormalities [see Warnings and Precautions (5.7)]
- Increase in Blood Pressure [see Warnings and Precautions (5.8)]
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.
The adverse reactions that result from levetiracetam injection use include all of those reported for levetiracetam tablets and oral solution.
Equivalent doses of intravenous (IV) levetiracetam and oral levetiracetam result in equivalent Cmax , Cmin , and total systemic exposure to levetiracetam when the IV levetiracetam is administered as a 15-minute infusion.
In controlled clinical studies using levetiracetam tablets in adults with partial-onset seizures [see Clinical Studies (14.1)] , the most common adverse reactions in adult patients receiving levetiracetam in combination with other AEDs, for events with rates greater than placebo, were somnolence, asthenia, infection, and dizziness. Of the most common adverse reactions in adults experiencing partial onset seizures, asthenia, somnolence, and dizziness occurred predominantly during the first 4 weeks of treatment with levetiracetam.
Table 3 lists adverse reactions that occurred in at least 1% of adult epilepsy patients receiving levetiracetam tablets in placebo-controlled studies and were numerically more common than in patients treated with placebo. In these studies, either levetiracetam or placebo was added to concurrent AED therapy.
Table 3: Adverse Reactions* in Pooled Placebo-Controlled, Adjunctive Studies in Adults Experiencing Partial-Onset Seizures
|Levetiracetam(N=769) %||Placebo(N=439) %|
* Adverse reactions occurred in at least 1% of levetiracetam-treated patients and occurred more frequently than placebo-treated patients
In controlled adult clinical studies using levetiracetam tablets, 15% of patients receiving levetiracetam and 12% receiving placebo either discontinued or had a dose reduction as a result of an adverse reaction. Table 4 lists the most common (>1%) adverse reactions that resulted in discontinuation or dose reduction and that occurred more frequently in levetiracetam-treated patients than in placebo-treated patients.
Table 4: Adverse Reactions That Resulted in Discontinuation or Dose Reduction in Pooled Placebo-Controlled Studies in Adults Experiencing Partial-Onset Seizures
|Adverse Reaction||Levetiracetam (N=769) %||Placebo (N=439) %|
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