Eligibility Criteria:
Inclusion Criteria:
* Subjects in Group 1 must be diagnosed with migraine for at least 1 year prior to study start. Subjects must also have received any dose of flunarizine for the prophylaxis of migraine, for a minimum of 4 weeks prior to the run-in phase. Subjects in Group 2 must be healthy subjects
* Weight within 15% of the ideal body weight according to height and frame size
* Healthy based on a detailed medical history, physical examination, and clinical laboratory evaluations
* Normal ECG at the time of screening
* Women of non-child bearing potential or practicing acceptable birth control
* Negative pregnancy test within 4 days of run-in phase
* Signed informed consent
Exclusion Criteria:
* History of significant medical disease (e.g., ophthalmologic, cardiovascular, renal, hepatic, gastrointestinal, hematological, endocrine, metabolic, neurologic or psychiatric disease)
* Conditions known to be contraindications to the use of flunarizine including obesity, hypotension, a history of depressive illness or pre-existing symptoms of Parkinson's disease or other extrapyramidal disorders
* History of an acquired or hereditary neurologic disease, e.g., epilepsy or significant brain trauma
* Subjects who are schizophrenic, exhibit bipolar disorder, or have exhibited any psychotic symptoms or have a history of any serious psychiatric disorder, including suicide attempt
* Subjects demonstrating significant active physical disease, acute or chronic, within 7 days prior to the start of the study
* Active liver disease
* Clinically significant abnormal laboratory tests including, but not limited to, an out-of-range screening TSH level, LFT levels greater than or equal to 2 times above the upper limit of normal, a creatinine level above the upper limit of normal
* Personal or family history of nephrolithiasis
* Allergy to heparin
* History of drug allergy or hypersensitivity to sulfonamides (including RWJ-17021-000, topiramate)
* Malignancy or history of malignancy within the last 5 years with the exception of treated basal cell carcinoma
* Glaucoma
* Testing positive for hepatitis B surface antigen, hepatitis C antibody, HIV antibody, and drugs of abuse, including alcohol
* History of alcohol or drug abuse
* Subjects taking concomitant medications within 14 days prior to Day 1 including iodinated contrast materials that have not been preapproved by the Medical Monitor and Global Clinical Pharmacokinetics Leader
* Subjects who have taken medications that are known cytochrome P450 inducers or inhibitors (see Attachment 4) within the 28 days prior to Day 1
* Subjects who have taken prescription medications within 14 days prior to Day 1 (with the exception of chronic thyroid therapy and rescue/abortive medication for migraine headache) or
* Over-the-counter medications (including aspirin, vitamins) within 7 days prior to Day 1 or antacids within the 48 hours prior to Day 1
* Use tobacco products during the 3 months prior to screening
* Consumption of grapefruit and Seville orange containing products, or herbal medications within the 28 days prior to Day 1
* Drinking alcohol for at least 7 days prior to Day 1
* Subjects who have not limited the consumption of methylxanthine containing products to 2, 8 oz. drinks/day or less within the 24 hours prior to each confinement
* Female subjects who are pregnant and/or nursing
* Subjects who have received an experimental drug, donated blood, or used an experimental medical device within 30 days prior to screening (also subjects who have been recent participants in a topiramate study, within 2 weeks of screening