Levetiracetam Injection Adverse Reactions

6 ADVERSE REACTIONS

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)]
•
Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS)/Multiorgan Hypersensitivity [see Warnings and Precautions (5.5)]
•
Coordination Difficulties [see Warnings and Precautions (5.6)]
•
Hematologic Abnormalities [see Warnings and Precautions (5.8)]
•
Increase in Blood Pressure [see Warnings and Precautions (5.9)]

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.

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.

Partial-Onset Seizures

Adults

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.

Asthenia

15

9

Somnolence

15

8

Headache

14

13

Infection

13

8

Dizziness

9

4

Pain

7

6

Pharyngitis

6

4

Depression

4

2

Nervousness

4

2

Rhinitis

4

3

Anorexia

3

2

Ataxia

3

1

Vertigo

3

1

Amnesia

2

1

Anxiety

2

1

Cough Increased

2

1

Diplopia

2

1

Emotional Lability

2

0

Hostility

2

1

Paresthesia

2

1

Sinusitis

2

1

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 ReactionLevetiracetam
(N=769)
%		Placebo
(N=439)
%

Somnolence

4

2

Dizziness

1

0

Pediatric Patients 4 Years to < 16 Years

The adverse reaction data presented below was obtained from a pooled analysis of two controlled pediatric clinical studies using an oral formulation in pediatric patients 4 to 16 years of age with partial-onset seizures. The most common adverse reactions in pediatric patients receiving levetiracetam in combination with other AEDs, for events with rates greater than placebo, were fatigue, aggression, nasal congestion, decreased appetite, and irritability.

Table 5 lists adverse reactions from the pooled pediatric controlled studies (4 to 16 years of age) that occurred in at least 2% of pediatric levetiracetam-treated patients and were numerically more common than in pediatric patients treated with placebo. In these studies, either levetiracetam or placebo was added to concurrent AED therapy.

Table 5: Adverse Reactions* in Pooled Placebo-Controlled, Adjunctive Studies in Pediatric Patients Ages 4 to 16 Years Experiencing Partial-Onset Seizures
Levetiracetam
(N=165)
%		Placebo
(N=131)
%
*
Adverse reactions occurred in at least 2% of pediatric levetiracetam-treated patients and occurred more frequently than placebo-treated patients.

Headache

19

15

Nasopharyngitis

15

12

Vomiting

15

12

Somnolence

13

9

Fatigue

11

5

Aggression

10

5

Upper Abdominal Pain

9

8

Cough

9

5

Nasal Congestion

9

2

Decreased Appetite

8

2

Abnormal Behavior

7

4

Dizziness

7

5

Irritability

7

1

Pharyngolaryngeal Pain

7

4

Diarrhea

6

2

Lethargy

6

5

Insomnia

5

3

Agitation

4

1

Anorexia

4

3

Head Injury

4

0

Constipation

3

1

Contusion

3

1

Depression

3

1

Fall

3

2

Influenza

3

1

Mood Altered

3

1

Affect Lability

2

1

Anxiety

2

1

Arthralgia

2

0

Confusional State

2

0

Conjunctivitis

2

0

Ear Pain

2

1

Gastroenteritis

2

0

Joint Sprain

2

1

Mood Swings

2

1

Neck Pain

2

1

Rhinitis

2

0

Sedation

2

1

In the controlled pooled pediatric clinical studies in patients 4 to 16 years of age, 7% of patients receiving levetiracetam and 9% receiving placebo discontinued as a result of an adverse reaction.

Pediatric Patients 1 Month to < 4 Years

In the 7-day controlled pediatric clinical study using an oral formulation of levetiracetam in children 1 month to less than 4 years of age with partial-onset seizures, the most common adverse reactions in patients receiving levetiracetam in combination with other AEDs, for events with rates greater than placebo, were somnolence and irritability. Because of the shorter exposure period, incidences of adverse reactions are expected to be lower than in other pediatric studies in older patients. Therefore, other controlled pediatric data, presented above, should also be considered to apply to this age group.

Table 6 lists adverse reactions that occurred in at least 5% of pediatric epilepsy patients (ages 1 month to < 4 years) treated with levetiracetam in the placebo-controlled study and were numerically more common than in patients treated with placebo. In this study, either levetiracetam or placebo was added to concurrent AED therapy.

Table 6: Adverse Reactions* in a Placebo-Controlled, Adjunctive Study in Pediatric Patients Ages 1 Month to < 4 Years Experiencing Partial-Onset Seizures
Levetiracetam
(N=60)
%		Placebo
(N=56)
%
*
Adverse reactions occurred in at least 5% of levetiracetam-treated patients and occurred more frequently than placebo-treated patients.

Somnolence

13

2

Irritability

12

0

In the 7-day controlled pediatric clinical study in patients 1 month to < 4 years of age, 3% of patients receiving levetiracetam and 2% receiving placebo either discontinued or had a dose reduction as a result of an adverse reaction. There was no adverse reaction that resulted in discontinuation for more than one patient.

Myoclonic Seizures

Although the pattern of adverse reactions in this study seems somewhat different from that seen in patients with partial-onset seizures, this is likely due to the much smaller number of patients in this study compared to partial seizure studies. The adverse reaction pattern for patients with JME is expected to be essentially the same as for patients with partial seizures.

In the controlled clinical study using levetiracetam tablets in patients with myoclonic seizures [see Clinical Studies (14.2)], the most common adverse reactions in patients receiving levetiracetam in combination with other AEDs, for events with rates greater than placebo, were somnolence, neck pain, and pharyngitis.

Table 7 lists adverse reactions that occurred in at least 5% of juvenile myoclonic epilepsy patients experiencing myoclonic seizures treated with levetiracetam tablets and were numerically more common than in patients treated with placebo. In this study, either levetiracetam or placebo was added to concurrent AED therapy.

Table 7: Adverse Reactions* in a Placebo-Controlled, Adjunctive Study in Patients 12 Years of Age and Older with Myoclonic Seizures
Levetiracetam
(N=60)
%		Placebo
(N=60)
%
*
Adverse reactions occurred in at least 5% of levetiracetam-treated patients and occurred more frequently than placebo-treated patients

Somnolence

12

2

Neck pain

8

2

Pharyngitis

7

0

Depression

5

2

Influenza

5

2

Vertigo

5

3

In the placebo-controlled study using levetiracetam tablets in patients with JME, 8% of patients receiving levetiracetam and 2% receiving placebo either discontinued or had a dose reduction as a result of an adverse reaction. The adverse reactions that led to discontinuation or dose reduction and that occurred more frequently in levetiracetam-treated patients than in placebo-treated patients are presented in Table 8.

Table 8: Adverse Reactions that Resulted in Discontinuation or Dose Reduction in Patients with Juvenile Myoclonic Epilepsy
Adverse ReactionLevetiracetam
(N=60)
%		Placebo
(N=60)
%

  Anxiety

3

2

  Depressed mood

2

0

  Depression

2

0

  Diplopia

2

0

  Hypersomnia

2

0

  Insomnia

2

0

  Irritability

2

0

  Nervousness

2

0

  Somnolence

2

0

Primary Generalized Tonic-Clonic Seizures

Although the pattern of adverse reactions in this study seems somewhat different from that seen in patients with partial seizures, this is likely due to the much smaller number of patients in this study compared to partial seizure studies. The adverse reaction pattern for patients with primary generalized tonic-clonic (PGTC) seizures is expected to be essentially the same as for patients with partial seizures.

In the controlled clinical study that included patients 4 years of age and older with PGTC seizures, the most common adverse reaction in patients receiving levetiracetam oral formulation in combination with other AEDs, for events with rates greater than placebo was nasopharyngitis.

Table 9 lists adverse reactions that occurred in at least 5% of idiopathic generalized epilepsy patients experiencing PGTC seizures treated with levetiracetam and were numerically more common than in patients treated with placebo. In this study, either levetiracetam or placebo was added to concurrent AED therapy.

Table 9: Adverse Reactions* in a Placebo-Controlled, Adjunctive Study in Patients 4 Years of Age and Older with PGTC Seizures
Levetiracetam
(N=79)
%		Placebo
(N=84)
%
*
Adverse reactions occurred in at least 5% of levetiracetam-treated patients and occurred more frequently than placebo-treated patients.

Nasopharyngitis

14

5

Fatigue

10

8

Diarrhea

8

7

Irritability

6

2

Mood swings

5

1

In the placebo-controlled study, 5% of patients receiving levetiracetam and 8% receiving placebo either discontinued or had a dose reduction during the treatment period as a result of an adverse reaction.

This study was too small to adequately characterize the adverse reactions that could be expected to result in discontinuation of treatment in this population. It is expected that the adverse reactions that would lead to discontinuation in this population would be similar to those resulting in discontinuation in other epilepsy trials (see tables 4 and 8).

In addition, the following adverse reactions were seen in other controlled adult studies of levetiracetam: balance disorder, disturbance in attention, eczema, memory impairment, myalgia, and blurred vision.

Comparison of Gender, Age and Race

The overall adverse reaction profile of levetiracetam was similar between females and males. There are insufficient data to support a statement regarding the distribution of adverse reactions by age and race.

6.2 Postmarketing Experience

The following adverse reactions have been identified during postapproval use of levetiracetam. 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.

The following adverse reactions have been reported in patients receiving levetiracetam worldwide. The listing is alphabetized: abnormal liver function test, acute kidney injury, anaphylaxis, angioedema, agranulocytosis, choreoathetosis, drug reaction with eosinophilia and systemic symptoms (DRESS), dyskinesia, erythema multiforme, hepatic failure, hepatitis, hyponatremia, muscular weakness, obsessive-compulsive disorders (OCD), pancreatitis, pancytopenia (with bone marrow suppression identified in some of these cases), panic attack, thrombocytopenia, weight loss, and worsening of seizures including in patients with SCN8A mutations. Alopecia has been reported with levetiracetam use; recovery was observed in majority of cases where levetiracetam was discontinued.

Find Levetiracetam Injection medical information:

Find Levetiracetam Injection medical information:

Our scientific content is evidence-based, scientifically balanced and non-promotional. It undergoes rigorous internal medical review and is updated regularly to reflect new information.

Levetiracetam Injection Quick Finder

Prescribing Information
Download Prescribing Information

Health Professional Information

Adverse Reactions

6 ADVERSE REACTIONS

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)]
•
Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS)/Multiorgan Hypersensitivity [see Warnings and Precautions (5.5)]
•
Coordination Difficulties [see Warnings and Precautions (5.6)]
•
Hematologic Abnormalities [see Warnings and Precautions (5.8)]
•
Increase in Blood Pressure [see Warnings and Precautions (5.9)]

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.

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.

Partial-Onset Seizures

Adults

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.

Asthenia

15

9

Somnolence

15

8

Headache

14

13

Infection

13

8

Dizziness

9

4

Pain

7

6

Pharyngitis

6

4

Depression

4

2

Nervousness

4

2

Rhinitis

4

3

Anorexia

3

2

Ataxia

3

1

Vertigo

3

1

Amnesia

2

1

Anxiety

2

1

Cough Increased

2

1

Diplopia

2

1

Emotional Lability

2

0

Hostility

2

1

Paresthesia

2

1

Sinusitis

2

1

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 ReactionLevetiracetam
(N=769)
%		Placebo
(N=439)
%

Somnolence

4

2

Dizziness

1

0

Pediatric Patients 4 Years to < 16 Years

The adverse reaction data presented below was obtained from a pooled analysis of two controlled pediatric clinical studies using an oral formulation in pediatric patients 4 to 16 years of age with partial-onset seizures. The most common adverse reactions in pediatric patients receiving levetiracetam in combination with other AEDs, for events with rates greater than placebo, were fatigue, aggression, nasal congestion, decreased appetite, and irritability.

Table 5 lists adverse reactions from the pooled pediatric controlled studies (4 to 16 years of age) that occurred in at least 2% of pediatric levetiracetam-treated patients and were numerically more common than in pediatric patients treated with placebo. In these studies, either levetiracetam or placebo was added to concurrent AED therapy.

Table 5: Adverse Reactions* in Pooled Placebo-Controlled, Adjunctive Studies in Pediatric Patients Ages 4 to 16 Years Experiencing Partial-Onset Seizures
Levetiracetam
(N=165)
%		Placebo
(N=131)
%
*
Adverse reactions occurred in at least 2% of pediatric levetiracetam-treated patients and occurred more frequently than placebo-treated patients.

Headache

19

15

Nasopharyngitis

15

12

Vomiting

15

12

Somnolence

13

9

Fatigue

11

5

Aggression

10

5

Upper Abdominal Pain

9

8

Cough

9

5

Nasal Congestion

9

2

Decreased Appetite

8

2

Abnormal Behavior

7

4

Dizziness

7

5

Irritability

7

1

Pharyngolaryngeal Pain

7

4

Diarrhea

6

2

Lethargy

6

5

Insomnia

5

3

Agitation

4

1

Anorexia

4

3

Head Injury

4

0

Constipation

3

1

Contusion

3

1

Depression

3

1

Fall

3

2

Influenza

3

1

Mood Altered

3

1

Affect Lability

2

1

Anxiety

2

1

Arthralgia

2

0

Confusional State

2

0

Conjunctivitis

2

0

Ear Pain

2

1

Gastroenteritis

2

0

Joint Sprain

2

1

Mood Swings

2

1

Neck Pain

2

1

Rhinitis

2

0

Sedation

2

1

In the controlled pooled pediatric clinical studies in patients 4 to 16 years of age, 7% of patients receiving levetiracetam and 9% receiving placebo discontinued as a result of an adverse reaction.

Pediatric Patients 1 Month to < 4 Years

In the 7-day controlled pediatric clinical study using an oral formulation of levetiracetam in children 1 month to less than 4 years of age with partial-onset seizures, the most common adverse reactions in patients receiving levetiracetam in combination with other AEDs, for events with rates greater than placebo, were somnolence and irritability. Because of the shorter exposure period, incidences of adverse reactions are expected to be lower than in other pediatric studies in older patients. Therefore, other controlled pediatric data, presented above, should also be considered to apply to this age group.

Table 6 lists adverse reactions that occurred in at least 5% of pediatric epilepsy patients (ages 1 month to < 4 years) treated with levetiracetam in the placebo-controlled study and were numerically more common than in patients treated with placebo. In this study, either levetiracetam or placebo was added to concurrent AED therapy.

Table 6: Adverse Reactions* in a Placebo-Controlled, Adjunctive Study in Pediatric Patients Ages 1 Month to < 4 Years Experiencing Partial-Onset Seizures
Levetiracetam
(N=60)
%		Placebo
(N=56)
%
*
Adverse reactions occurred in at least 5% of levetiracetam-treated patients and occurred more frequently than placebo-treated patients.

Somnolence

13

2

Irritability

12

0

In the 7-day controlled pediatric clinical study in patients 1 month to < 4 years of age, 3% of patients receiving levetiracetam and 2% receiving placebo either discontinued or had a dose reduction as a result of an adverse reaction. There was no adverse reaction that resulted in discontinuation for more than one patient.

Myoclonic Seizures

Although the pattern of adverse reactions in this study seems somewhat different from that seen in patients with partial-onset seizures, this is likely due to the much smaller number of patients in this study compared to partial seizure studies. The adverse reaction pattern for patients with JME is expected to be essentially the same as for patients with partial seizures.

In the controlled clinical study using levetiracetam tablets in patients with myoclonic seizures [see Clinical Studies (14.2)], the most common adverse reactions in patients receiving levetiracetam in combination with other AEDs, for events with rates greater than placebo, were somnolence, neck pain, and pharyngitis.

Table 7 lists adverse reactions that occurred in at least 5% of juvenile myoclonic epilepsy patients experiencing myoclonic seizures treated with levetiracetam tablets and were numerically more common than in patients treated with placebo. In this study, either levetiracetam or placebo was added to concurrent AED therapy.

Table 7: Adverse Reactions* in a Placebo-Controlled, Adjunctive Study in Patients 12 Years of Age and Older with Myoclonic Seizures
Levetiracetam
(N=60)
%		Placebo
(N=60)
%
*
Adverse reactions occurred in at least 5% of levetiracetam-treated patients and occurred more frequently than placebo-treated patients

Somnolence

12

2

Neck pain

8

2

Pharyngitis

7

0

Depression

5

2

Influenza

5

2

Vertigo

5

3

In the placebo-controlled study using levetiracetam tablets in patients with JME, 8% of patients receiving levetiracetam and 2% receiving placebo either discontinued or had a dose reduction as a result of an adverse reaction. The adverse reactions that led to discontinuation or dose reduction and that occurred more frequently in levetiracetam-treated patients than in placebo-treated patients are presented in Table 8.

Table 8: Adverse Reactions that Resulted in Discontinuation or Dose Reduction in Patients with Juvenile Myoclonic Epilepsy
Adverse ReactionLevetiracetam
(N=60)
%		Placebo
(N=60)
%

  Anxiety

3

2

  Depressed mood

2

0

  Depression

2

0

  Diplopia

2

0

  Hypersomnia

2

0

  Insomnia

2

0

  Irritability

2

0

  Nervousness

2

0

  Somnolence

2

0

Primary Generalized Tonic-Clonic Seizures

Although the pattern of adverse reactions in this study seems somewhat different from that seen in patients with partial seizures, this is likely due to the much smaller number of patients in this study compared to partial seizure studies. The adverse reaction pattern for patients with primary generalized tonic-clonic (PGTC) seizures is expected to be essentially the same as for patients with partial seizures.

In the controlled clinical study that included patients 4 years of age and older with PGTC seizures, the most common adverse reaction in patients receiving levetiracetam oral formulation in combination with other AEDs, for events with rates greater than placebo was nasopharyngitis.

Table 9 lists adverse reactions that occurred in at least 5% of idiopathic generalized epilepsy patients experiencing PGTC seizures treated with levetiracetam and were numerically more common than in patients treated with placebo. In this study, either levetiracetam or placebo was added to concurrent AED therapy.

Table 9: Adverse Reactions* in a Placebo-Controlled, Adjunctive Study in Patients 4 Years of Age and Older with PGTC Seizures
Levetiracetam
(N=79)
%		Placebo
(N=84)
%
*
Adverse reactions occurred in at least 5% of levetiracetam-treated patients and occurred more frequently than placebo-treated patients.

Nasopharyngitis

14

5

Fatigue

10

8

Diarrhea

8

7

Irritability

6

2

Mood swings

5

1

In the placebo-controlled study, 5% of patients receiving levetiracetam and 8% receiving placebo either discontinued or had a dose reduction during the treatment period as a result of an adverse reaction.

This study was too small to adequately characterize the adverse reactions that could be expected to result in discontinuation of treatment in this population. It is expected that the adverse reactions that would lead to discontinuation in this population would be similar to those resulting in discontinuation in other epilepsy trials (see tables 4 and 8).

In addition, the following adverse reactions were seen in other controlled adult studies of levetiracetam: balance disorder, disturbance in attention, eczema, memory impairment, myalgia, and blurred vision.

Comparison of Gender, Age and Race

The overall adverse reaction profile of levetiracetam was similar between females and males. There are insufficient data to support a statement regarding the distribution of adverse reactions by age and race.

6.2 Postmarketing Experience

The following adverse reactions have been identified during postapproval use of levetiracetam. 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.

The following adverse reactions have been reported in patients receiving levetiracetam worldwide. The listing is alphabetized: abnormal liver function test, acute kidney injury, anaphylaxis, angioedema, agranulocytosis, choreoathetosis, drug reaction with eosinophilia and systemic symptoms (DRESS), dyskinesia, erythema multiforme, hepatic failure, hepatitis, hyponatremia, muscular weakness, obsessive-compulsive disorders (OCD), pancreatitis, pancytopenia (with bone marrow suppression identified in some of these cases), panic attack, thrombocytopenia, weight loss, and worsening of seizures including in patients with SCN8A mutations. Alopecia has been reported with levetiracetam use; recovery was observed in majority of cases where levetiracetam was discontinued.
Medication Guide

Health Professional Information

{{section_name_patient}}

{{section_body_html_patient}}

Resources

Didn’t find what you were looking for? Contact us.

MI Digital Assistant

Chat online with Pfizer Medical Information regarding your inquiry on a Pfizer medicine.

Call 800-438-1985*

*Speak with a Pfizer Medical Information Professional regarding your medical inquiry. Available 9AM-5PM ET Monday to Friday; excluding holidays.

Medical Inquiry

Submit a medical question for Pfizer prescription products.

Report Adverse Event

Pfizer Safety

To report an adverse event related to the Pfizer-BioNTech COVID-19 Vaccine, and you are not part of a clinical trial* for this product, click the link below to submit your information:

Pfizer Safety Reporting Site

*If you are involved in a clinical trial for this product, adverse events should be reported to your coordinating study site.

If you cannot use the above website, or would like to report an adverse event related to a different Pfizer product, please call Pfizer Safety at (800) 438-1985.

FDA Medwatch

You may also contact the U.S. Food and Drug Administration (FDA) directly to report adverse events or product quality concerns either online at www.fda.gov/medwatch or call (800) 822-7967.