The Safety and Efficacy of Divalproex Sodium Extended-Release Tablets in Migraine Prophylaxis: A Study in Adolescents
The Safety and Efficacy of Divalproex Sodium Extended-Release Tablets in Migraine Prophylaxis: A Study in Adolescents
The purpose of this study is to determine whether Depakote ER is safe and effective in the
 reduction of occurrence of migraine headaches in adolescents.
Inclusion Criteria:

 -  Subject and subject's legal representative have voluntarily signed and dated an
 IRB-approved informed assent form and an IRB-approved informed consent form,
 respectively, before any study-specific procedures or tests are performed, including
 the discontinuation of any prohibited medications

 -  Subject is male or a non-pregnant, non-lactating female;

 -  Subject is between 12 and 17 years of age, inclusive, at randomization;

 -  Subject weighs between 77 lbs (i.e., 35 kg) and 220 lbs (i.e., 100 kg) inclusive;

 -  Subject currently has migraine headaches diagnosed according to the International
 Headache Society (IHS) diagnostic criteria occurring at an average frequency of at
 least 3, but no more than 12, migraine headaches per month during the 3 months prior
 to screening. Migraine headaches separated by a headache-free interval of < 48 hours
 will be considered one migraine headache in assessing this criterion;

 -  Subject's initial onset of migraine headache precedes the Screening Visit by at least
 12 months;

 -  Subject is judged to be in generally good health based on the results of a medical
 history, physical examination, 12-lead electrocardiogram (ECG), and laboratory
 profile. When the Screening and Baseline Visits are combined as described in Section
 5.1, continuing participation in the Baseline Phase will be contingent upon laboratory
 and ECG results. Any repeat laboratory testing must be completed in consultation with
 the Abbott Medical Monitor prior to randomization.

 Experimental Phase

 -  The following criteria define eligibility for subject enrollment in the

 Experimental Phase and subsequent randomization and study drug assignment:

 -  Subject experienced at least 3, but no more than 12, migraine headaches (separated by
 headache-free intervals of at least 48 hours), diagnosed according to the IHS
 diagnostic criteria,6 during the 4-week Baseline Phase of the study; and

 -  Subject is still eligible for the study based on Baseline Phase inclusion criteria.

 Exclusion Criteria Baseline Phase

 -  History of allergic reaction or significant sensitivity to valproate or similar drugs;

 -  History of noncompliance with medication or medical instructions;

 -  Previously randomized in this study;

 -  Recent (previous 6 months) history of drug and/or alcohol abuse or has a positive
 urine drug screen, at the Screening Visit, for drugs of abuse (e.g., amphetamines,
 barbiturates, benzodiazepines, cocaine, opiates, and phencyclidine [PCP]);

 -  Female, of childbearing potential, and not using an effective method of birth control
 (e.g., total sexual abstinence or contraceptives);

 -  History of cluster headaches (see Appendix G, Diagnostic Criteria for Headaches),
 seizure disorder, or suspected history of seizure disorder;

 -  History of headaches of any type occurring on 15 or more days per month, on average,
 or uses medications excessively for headaches (e.g., regularly taking medication on
 more than 10 days per month);

 -  Failed more than 2 adequate regimens of prophylactic antimigraine medications,
 including antiepilepsy drug(s) (e.g., gabapentin, topiramate) or 1 adequate regimen of
 valproate;

 -  Use of any prophylactic antimigraine medication within a period equivalent to < 5
 half-lives of that medication before entering the Baseline Phase;

 -  Daily use of any analgesic, ergotamine preparation, or nonsteroidal anti- inflammatory
 agent (see Appendix J, Examples of Prohibited Medications);

 -  Use of the following medication classes or any specific drug listed below:

 -  anticoagulants

 -  antidepressants

 -  antiepileptics

 -  antipsychotics

 -  benzodiazepines

 -  beta-adrenergic blocking agents

 -  calcium channel antagonists

 -  cimetidine

 -  corticosteroids

 -  cyproheptadine

 -  erythromycin

 -  ethosuximide

 -  lithium salts

 -  methysergide

 -  phenobarbital

 -  pemoline

 -  rifampin

 -  tolbutamide

 -  or zidovudine

 -  Use of valproate within 30 days prior to screening;

 -  Use of aspirin and/or any aspirin-containing product (e.g., Excedrin Migraine,
 Pepto-Bismol, Alka Seltzer) within 5 half-lives prior to randomization or at any time
 during the Experimental Phase of the study;

 -  Use of stimulants for Attention-Deficit Hyperactivity Disorder (ADHD) (with the
 exception of pemoline, Cylert) where a stable treatment regimen has not been
 established for a minimum of at least 2 months prior to screening or the treatment
 regimen that has been established is at risk of changing sometime during the trial;

 -  Any serious medical or psychiatric disorder(s) that may confound the interpretation of
 the results from this study;

 -  Central nervous system (CNS) neoplasm, CNS infection, demyelinating disease,
 degenerative neurological disease, or any progressive CNS disease;

 -  History of encephalopathy, hepatitis, pancreatitis, or urea-cycle disorder or any
 underlying condition/disease, which might interfere with study drug absorption or
 completion of study drug therapy evaluation throughout the duration of the trial;

 -  Screening laboratory results indicate the presence of Hepatitis B surface antigen
 (HBSAG), or Hepatitis C antibody or known history of any positive test result for HIV;

 -  Screening laboratory results indicate: Platelet count </= 100,000/uL ALT or AST >/= 2
 times Upper Limit of Normal (ULN);

 -  Receipt of an investigational drug within 30 days prior to study drug administration
 or scheduled to receive any other investigational drug anytime during the study; or

 -  For any reason, subject is considered by the investigator to be an unsuitable
 candidate to receive Depakote or to participate in this study. Experimental Phase

 -  Subjects exhibiting any of the following will be ineligible:

 -  A positive pregnancy test result on Study Day 1;

 -  Failure to properly maintain the Headache and Medication Diary, during the Baseline
 phase, to the extent that headache occurrences cannot be determined, due to
 noncompliance;

 -  Excessive use of symptomatic medication(s) during the Baseline Phase (e.g., regularly
 taking medication on more than 10 days per month); or

 -  Ineligibility for the study based on the Baseline Phase exclusion criteria.