Pregabalin (Page 5 of 16)

Controlled Studies of Adjunctive Therapy for Partial-Onset Seizures in Adult Patients

Adverse Reactions Leading to Discontinuation

Approximately 15% of patients receiving pregabalin and 6% of patients receiving placebo in trials of adjunctive therapy for partial-onset seizures discontinued prematurely due to adverse reactions. In the pregabalin treatment group, the adverse reactions most frequently leading to discontinuation were dizziness (6%), ataxia (4%), and somnolence (3%). In comparison, less than 1% of patients in the placebo group withdrew due to each of these events. Other adverse reactions that led to discontinuation of at least 1% of patients in the pregabalin group and at least twice as frequently compared to the placebo group were asthenia, diplopia, blurred vision, thinking abnormal, nausea, tremor, vertigo, headache, and confusion (which each led to withdrawal in 2% or less of patients).

Most Common Adverse Reactions

Table 6 lists all dose-related adverse reactions occurring in at least 2% of all pregabalin-treated patients. Dose-relatedness was defined as the incidence of the adverse event in the 600 mg/day group was at least 2% greater than the rate in both the placebo and 150 mg/day groups. In these studies, 758 patients received pregabalin and 294 patients received placebo for up to 12 weeks. A majority of pregabalin-treated patients in clinical studies had adverse reactions with a maximum intensity of “mild” or “moderate”.

Table 6. Dose-related Adverse Reaction Incidence in Controlled Trials of Adjunctive Therapy for Partial-Onset Seizures in Adult Patients
Body System 150 mg/d 300 mg/d 600 mg/d All PGB * Placebo
Preferred Term [N = 185] [N = 90] [N = 395] [N = 670] [N = 294]
% % % % %
*
PGB: pregabalin
Excludes patients who received the 50 mg dose in Study E1.
Thinking abnormal primarily consists of events related to difficulty with concentration/attention but also includes events related to cognition and language problems and slowed thinking.
§
Investigator term; summary level term is amblyopia.
Body as a Whole
Accidental Injury 7 11 10 9 5
Pain 3 2 5 4 3
Digestive System
Increased Appetite 2 3 6 5 1
Dry Mouth 1 2 6 4 1
Constipation 1 1 7 4 2
Metabolic and Nutritional Disorders
Weight Gain 5 7 16 12 1
Peripheral Edema 3 3 6 5 2
Nervous System
Dizziness 18 31 38 32 11
Somnolence 11 18 28 22 11
Ataxia 6 10 20 15 4
Tremor 3 7 11 8 4
Thinking Abnormal 4 8 9 8 2
Amnesia 3 2 6 5 2
Speech Disorder 1 2 7 5 1
Incoordination 1 3 6 4 1
Abnormal Gait 1 3 5 4 0
Twitching 0 4 5 4 1
Confusion 1 2 5 4 2
Myoclonus 1 0 4 2 0
Special Senses
Blurred Vision § 5 8 12 10 4
Diplopia 5 7 12 9 4
Abnormal Vision 3 1 5 4 1

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