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Gabitril (Tiagabine Hydrochloride) - Side Effects and Adverse Reactions

 
 



ADVERSE REACTIONS

The most commonly observed adverse events in placebo-controlled, parallel-group, add-on epilepsy trials associated with the use of GABITRIL in combination with other antiepilepsy drugs not seen at an equivalent frequency among placebo-treated patients were dizziness/light-headedness, asthenia/lack of energy, somnolence, nausea, nervousness/irritability, tremor, abdominal pain, and thinking abnormal/difficulty with concentration or attention.

Approximately 21% of the 2531 patients who received GABITRIL in clinical trials of epilepsy discontinued treatment because of an adverse event. The adverse events most commonly associated with discontinuation were dizziness (1.7%), somnolence (1.6%), depression (1.3%), confusion (1.1%), and asthenia (1.1%).

In Studies 1 and 2 (U.S. studies), the double-blind, placebo-controlled, parallel-group, add-on studies, the proportion of patients who discontinued treatment because of adverse events was 11% for the group treated with GABITRIL and 6% for the placebo group. The most common adverse events considered the primary reason for discontinuation were confusion (1.2%), somnolence (1.0%), and ataxia (1.0%).

Adverse Event Incidence in Controlled Clinical Trials

Table 5 lists treatment-emergent signs and symptoms that occurred in at least 1% of patients treated with GABITRIL for epilepsy participating in parallel-group, placebo-controlled trials and were numerically more common in the GABITRIL group. In these studies, either GABITRIL or placebo was added to the patient’s current antiepilepsy drug therapy. Adverse events were usually mild or moderate in intensity.

The prescriber should be aware that these figures, obtained when GABITRIL was added to concurrent antiepilepsy drug therapy, cannot be used to predict the frequency of adverse events in the course of usual medical practice when patient characteristics and other factors may differ from those prevailing during clinical studies. Similarly, the cited frequencies cannot be directly compared with figures obtained from other clinical investigations involving different treatments, uses, or investigators. An inspection of these frequencies, however, does provide the prescribing physician with one basis to estimate the relative contribution of drug and non-drug factors to the adverse event incidences in the population studied.

Table 5: Treatment-Emergent Adverse Event Incidence in Parallel-Group, 1

Placebo-Controlled, Add-On Trials (events in at least 1% of patients treated with GABITRIL and numerically more frequent than in the placebo group)

Body System/

COSTART

GABITRIL

N=494

%

Placebo

N=275

%

Body as a Whole
Abdominal Pain 7 3
Pain (unspecified) 5 3
Cardiovascular
Vasodilation 2 1
Digestive
Nausea 11 9
Diarrhea 7 3
Vomiting 7 4
Increased Appetite 2 0
Mouth Ulceration 1 0
Musculoskeletal
Myasthenia 1 0
Nervous System
Dizziness 27 15
Asthenia 20 14
Somnolence 18 15
Nervousness 10 3
Tremor 9 3
Difficulty with Concentration/Attention* 6 2
Insomnia 6 4
Ataxia 5 3
Confusion 5 3
Speech Disorder 4 2
Difficulty with Memory* 4 3
Paresthesia 4 2
Depression 3 1
Emotional Lability 3 2
Abnormal Gait 3 2
Hostility 2 1
Nystagmus 2 1
Language Problems* 2 0
Agitation 1 0
Respiratory System
Pharyngitis 7 4
Cough Increased 4 3
Skin and Appendages
Rash 5 4
Pruritus 2 0

  Patients in these add-on studies were receiving one to three concomitant enzyme-inducing antiepilepsy drugs in addition to GABITRIL or placebo. Patients may have reported multiple adverse experiences; thus, patients may be included in more than one category. 1

*COSTART term substituted with a more clinically descriptive term.

Other events reported by 1% or more of patients treated with GABITRIL but equally or more frequent in the placebo group were: accidental injury, chest pain, constipation, flu syndrome, rhinitis, anorexia, back pain, dry mouth, flatulence, ecchymosis, twitching, fever, amblyopia, conjunctivitis, urinary tract infection, urinary frequency, infection, dyspepsia, gastroenteritis, nausea and vomiting, myalgia, diplopia, headache, anxiety, acne, sinusitis, and incoordination.

Study 1 was a dose-response study including doses of 32 mg and 56 mg. Table 6 shows adverse events reported at a rate of ≥ 5% in at least one GABITRIL group and more frequent than in the placebo group. Among these events, depression, tremor, nervousness, difficulty with concentration/attention, and perhaps asthenia exhibited a positive relationship to dose.

Table 6: Treatment-Emergent Adverse Event Incidence in Study 1 (events in at least 5% of patients treated with GABITRIL 32 or 56 mg  and numerically more frequent than in the placebo group)

Body System/COSTART Term

GABITRIL

56 mg

(N=57)

%

GABITRIL

32 mg

(N=88)

%

Placebo

(N=91)

%

Body as a Whole
Accidental Injury 21 15 20
Infection 19 10 12
Flu Syndrome 9 6 3
Pain 7 2 3
Abdominal Pain 5 7 4
Digestive System
Diarrhea 2 10 6
Hemic and Lymphatic System
Ecchymosis 0 6 1
Musculoskeletal System
Myalgia 5 2 3
Nervous System
Dizziness 28 31 12
Asthenia 23 18 15
Tremor 21 14 1
Somnolence 19 21 17
Nervousness 14 11 6
Concentration/Attention*

Difficulty with

14 7 3
Ataxia 9 6 6
Depression 7 1 0
Insomnia 5 6 3
Abnormal Gait 5 5 3
Hostility 5 5 2
Respiratory System
Pharyngitis 7 8 6
Special Senses
Amblyopia 4 9 8
Urogenital System
Urinary Tract Infection 5 0 2

Patients in this study were receiving one to three concomitant enzyme-inducing antiepilepsy drugs in addition to GABITRIL or placebo. Patients may have reported multiple adverse experiences; thus, patients may be included in more than one category.

* COSTART term substituted with a more clinically descriptive term.

The effects of GABITRIL in relation to those of placebo on the incidence of adverse events and the types of adverse events reported were independent of age, weight, and gender. Because only 10% of patients were non-Caucasian in parallel-group, placebo-controlled trials, there is insufficient data to support a statement regarding the distribution of adverse experience reports by race.

Other Adverse Events Observed During All Clinical Trials

GABITRIL has been administered to 2531 patients during all phase 2/3 clinical trials, only some of which were placebo-controlled. During these trials, all adverse events were recorded by the clinical investigators using terminology of their own choosing. To provide a meaningful estimate of the proportion of individuals having adverse events, similar types of events were grouped into a smaller number of standardized categories using modified COSTART dictionary terminology. These categories are used in the listing below. The frequencies presented represent the proportion of the 2531 patients exposed to GABITRIL who experienced events of the type cited on at least one occasion while receiving GABITRIL. All reported events are included except those already listed above, events seen only three times or fewer (unless potentially important), events very unlikely to be drug-related, and those too general to be informative. Events are included without regard to determination of a causal relationship to tiagabine.

Events are further classified within body system categories and enumerated in order of decreasing frequency using the following definitions: frequent adverse events are defined as those occurring in at least 1/100 patients; infrequent adverse events are those occurring in 1/100 to 1/1000 patients; rare events are those occurring in fewer than 1/1000 patients.

  Allergic reaction, chest pain, chills, cyst, neck pain, and malaise. Abscess, cellulitis, facial edema, halitosis, hernia, neck rigidity, neoplasm, pelvic pain, photosensitivity reaction, sepsis, sudden death, and suicide attempt. Body as a Whole: Frequent: Infrequent:

  Hypertension, palpitation, syncope, and tachycardia. Angina pectoris, cerebral ischemia, electrocardiogram abnormal, hemorrhage, hypotension, myocardial infarct, pallor, peripheral vascular disorder, phlebitis, postural hypotension, and thrombophlebitis. Cardiovascular System: Frequent: Infrequent:

  Gingivitis and stomatitis. Abnormal stools, cholecystitis, cholelithiasis, dysphagia, eructation, esophagitis, fecal incontinence, gastritis, gastrointestinal hemorrhage, glossitis, gum hyperplasia, hepatomegaly, increased salivation, liver function tests abnormal, melena, periodontal abscess, rectal hemorrhage, thirst, tooth caries, and ulcerative stomatitis. Digestive System: Frequent: Infrequent:

  Goiter and hypothyroidism. Endocrine System: Infrequent:

  Lymphadenopathy. Anemia, erythrocytes abnormal, leukopenia, petechia, and thrombocytopenia. Hemic and Lymphatic System: Frequent: Infrequent:

  Edema, peripheral edema, weight gain, and weight loss. Dehydration, hypercholesteremia, hyperglycemia, hyperlipemia, hypoglycemia, hypokalemia, and hyponatremia. Metabolic and Nutritional: Frequent: Infrequent:

  Arthralgia. Arthritis, arthrosis, bursitis, generalized spasm, and tendinous contracture. Musculoskeletal System: Frequent: Infrequent:

  Depersonalization, dysarthria, euphoria, hallucination, hyperkinesia, hypertonia, hypesthesia, hypokinesia, hypotonia, migraine, myoclonus, paranoid reaction, personality disorder, reflexes decreased, stupor, twitching, and vertigo. Abnormal dreams, apathy, choreoathetosis, circumoral paresthesia, CNS neoplasm, coma, delusions, dry mouth, dystonia, encephalopathy, hemiplegia, leg cramps, libido increased, libido decreased, movement disorder, neuritis, neurosis, paralysis, peripheral neuritis, psychosis, reflexes increased, and urinary retention. Nervous System: Frequent: Infrequent:

  Bronchitis, dyspnea, epistaxis, and pneumonia. Apnea, asthma, hemoptysis, hiccups, hyperventilation, laryngitis, respiratory disorder, and voice alteration. Respiratory System: Frequent: lnfrequent:

  Alopecia, dry skin, and sweating. Contact dermatitis, eczema, exfoliative dermatitis, furunculosis, herpes simplex, herpes zoster, hirsutism, maculopapular rash, psoriasis, skin benign neoplasm, skin carcinoma, skin discolorations, skin nodules, skin ulcer, subcutaneous nodule, urticaria, and vesiculobullous rash. Skin and Appendages: Frequent: Infrequent:

  Abnormal vision, ear pain, otitis media, and tinnitus. Blepharitis, blindness, deafness, eye pain, hyperacusis, keratoconjunctivitis, otitis externa, parosmia, photophobia, taste loss, taste perversion, and visual field defect. Special Senses: Frequent: Infrequent:

  Dysmenorrhea, dysuria, metrorrhagia, urinary incontinence, and vaginitis. Abortion, amenorrhea, breast enlargement, breast pain, cystitis, fibrocystic breast, hematuria, impotence, kidney failure, menorrhagia, nocturia, papanicolaou smear suspicious, polyuria, pyelonephritis, salpingitis, urethritis, urinary urgency, and vaginal hemorrhage. Urogenital System: Frequent: Infrequent:



REPORTS OF SUSPECTED GABITRIL SIDE EFFECTS / ADVERSE REACTIONS

Below is a sample of reports where side effects / adverse reactions may be related to Gabitril. The information is not vetted and should not be considered as verified clinical evidence.

Possible Gabitril side effects / adverse reactions in 27 year old male

Reported by a consumer/non-health professional from United States on 2011-11-15

Patient: 27 year old male weighing 64.0 kg (140.8 pounds)

Reactions: Psychomotor Hyperactivity, Head Injury, Increased Appetite, Pollakiuria, Logorrhoea, Loss of Consciousness

Adverse event resulted in: hospitalization

Suspect drug(s):
Abilify
    Dosage: continued in 2006; stopped and restarted on 07oct2011(10-15mg) also taken 30mg
    Administration route: Oral
    Indication: Major Depression

Abilify
    Dosage: continued in 2006; stopped and restarted on 07oct2011(10-15mg) also taken 30mg
    Administration route: Oral
    Indication: Depression

Gabitril
    Indication: Convulsion
    Start date: 2006-01-01

Gabitril
    Indication: Mood Swings
    Start date: 2006-01-01

Lexapro
    Dosage: duration:7years ago
    Indication: Depression

Lexapro
    Dosage: duration:7years ago
    Indication: Major Depression

Other drugs received by patient: Ibuprofen



Possible Gabitril side effects / adverse reactions in 50 year old male

Reported by a physician from United States on 2011-11-30

Patient: 50 year old male

Reactions: Myocardial Infarction

Suspect drug(s):
Gabitril

Other drugs received by patient: Tegretol



Possible Gabitril side effects / adverse reactions in 38 year old male

Reported by a physician from United States on 2011-12-02

Patient: 38 year old male

Reactions: Confusional State, Blood Creatine Phosphokinase Increased, Drug Ineffective, Dizziness, Convulsion

Suspect drug(s):
Gabitril

Other drugs received by patient: Neurontin; Tegretol



See index of all Gabitril side effect reports >>

Drug label data at the top of this Page last updated: 2012-06-04

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