Eligibility Criteria:
Inclusion Criteria:
Subject
* Is male or female, in otherwise good health, 18 to 65 years of age.
* Has history of chronic migraine (with or without aura) according to the criteria proposed by the Headache Classification Committee of the International Headache Society for at least 3 months prior to enrollment.
* Has onset of migraine before age 50.
* Is able to differentiate migraine from any other headache they may experience (e.g., tension-type headache).
* Has stable history of headache for at least 3 months prior to screening.
* Is not currently taking a migraine preventive or has been taking preventive for at least 30 days prior to screening and agrees to not start, stop, or change medication and/or dosage during the study period.
* If female of childbearing potential, has a negative urine pregnancy test at Visit 1 and uses, or agrees to use, for the duration of the study, a medically acceptable form of contraception as determined by the investigator.
* Complete abstinence from intercourse from 2 weeks prior to administration of study drug throughout the study, and for a time interval after completion or premature discontinuation from the study to account for elimination of the study drug (a minimum of 7 days); or,
* Surgically sterile (hysterectomy or tubal ligation or otherwise incapable of pregnancy); or,
* Sterilization of male partner; or,
* Intrauterine device with published data showing lowest expected failure rate is less than 1% per year; or,
* Double barrier method (i.e., 2 physical barriers OR 1 physical barrier plus spermicide) for a least 1 month prior to Visit 1 and throughout study; or,
* Hormonal contraceptives for at least 3 months prior to Visit 1 and throughout study.
Exclusion Criteria:
Subject
* Is unable to understand the study requirements, the informed consent, or complete headache records as required per protocol.
* Is pregnant, actively trying to become pregnant, or breast-feeding.
* Has experienced the following migraine variants: basilar migraine, aura without headache, familial hemiplegic migraine, complicated migraine, ophthalmoplegic migraine and retinal migraine.
* Has a history of Medication Overuse Headache in the 3 months prior to study enrollment or during the Baseline Period.
* Has abused, in the opinion of the Investigator, any of the following drugs, currently or within the past 1 year: opioids, alcohol, barbiturates, benzodiazepine, cocaine
* Has an unstable neurological condition or a significantly abnormal neurological examination with focal signs or signs of increased intracranial pressure.
* Suffers from cardiovascular disease (ischemic heart disease, including angina pectoris, myocardial infarction, documented silent ischemia, or with Prinzmetal's angina); has symptoms of ischemic heart disease; have uncontrolled hypertension; has electrocardiogram (ECG) results outside normal limits for clinically stable patients as judged by the investigator.
* Has a history of asthma, allergy, or nasal polyps developing for the first time over the age of 40.
* Has a history of peptic ulcer disease requiring therapeutic intervention in the year prior to study enrollment.
* Has a history of bleeding peptic ulcer disease or perforation of the stomach or intestine.
* Has a history of bleeding disorder.
* Has history of Non-steroidal anti-inflammatory drug (NSAID) induced gastritis, esophagitis, or duodenitis.
* Suffers from a serious illness, or an unstable medical condition that could require hospitalization, or could increase the risk of adverse events.
* Has significant (as determined by the investigator) cardiovascular risk factors that may include uncontrolled high blood pressure, post-menopausal women, males over 40 years old, hypercholesterolemia, obesity, diabetes mellitus, smoking, or a family history of cardiovascular disease in a 1st degree relative.
* Has a psychiatric condition, in the opinion of the investigator that may affect the interpretation of efficacy and safety data or contraindicates the subject's participation in the study.
* Has hypersensitivity, intolerance, or contraindication to the use of sumatriptan, any of its components, or any other 5-hydroxytryptamine1 (5-HT1) agonist.
* Has a hypersensitivity, intolerance, or contraindication to the use of naproxen, any of its components, or any other non-steroidal anti-inflammatory drug including aspirin and cyclooxygenase-2 (COX-2) inhibiting agents.
* Is currently taking a migraine prophylactic medication containing an ergotamine or ergot derivative such as dihydroergotamine (DHE) or methysergide.
* Has taken, or plans to take, a monoamine oxidase inhibitor (MAOI) including herbal preparations containing St. John's wort (Hypericum perforatum), anytime within the 2 weeks prior to screening through 2 weeks post final study treatment.
* Has received any investigational agents within 30 days prior to Visit 1.
* Plans to participate in another clinical study at any time during this study.