Compare the Properties and Characteristics of an Investigational Formulation of Lamotrigine With Placebo

A subject will be eligible for inclusion in this study only if all of the following criteria apply:

• Healthy as judged by the responsible physician or designee. No clinically significant abnormality identified on the medical or laboratory evaluation. A subject with a clinical abnormality or laboratory parameters outside the reference range for this age group may be included only if the Investigator and the Medical Monitor considers that the finding will not introduce additional risk factors and will not interfere with the study procedures.
• Volunteer must have a normal sense of taste and smell
• Non-smokers or ex-smokers who have given up smoking for at least 3 months. Subjects currently using oral nicotine replacement therapy will not be recruited for this study.

Exclusion Criteria:

A subject will not be eligible for inclusion in this study if any of the following criteria apply:

• Currently being treated for epilepsy or bipolar disorder
• History of allergic, anaphylactic, hypersensitivity or idiosyncratic reaction(s) to lamotrigine or drugs of a similar type.
• History of sensitivity to any of the following excipients- Mannitol, Crospovidone, Sucralose, Magnesium Stearate, artificial Cherry flavour, Ethylcellulose.
• History of clinically relevant skin rashes.
• History or presence of any medical disorder which in the view of the investigator and GSK Medical Monitor makes the subject unsuitable for the study.
• History of multiple allergies to drugs, chemicals or foods, or a history of a clinically important allergy (e.g. anaphylaxis) to any one substance.
• Currently suffering from perennial rhinitis or seasonal rhinitis, a cold, influenza or any other respiratory illness.
• Has received prescribed or non prescribed medication (including vitamins and herbal remedies) within 7 days prior to the test day which in the opinion of the investigator in consultation if necessary with the GSK Medical Monitor may interfere with the study procedure or compromise safety.
• Currently or recently prescribed any medication which may be affected by lamotrigine including antiepileptics.
• Participation in another sensory analysis study within 30 days preceding the test day.
• Treatment with an investigational drug within 30 days preceding the test day.
• Females with a positive hCG pregnancy test on the test day.
• Abuse of alcohol defined as an average weekly intake of greater than 21 units or an average daily intake of greater than 3 units for men and a weekly intake of greater than14 units or an average daily intake of greater than 2 units for women. [NOTE: 1 unit is equivalent to a half-pint (220mL) of beer or 1 (25mL) measure of spirits or 1 glass (125mL) of wine]. Subjects must be willing to abstain from alcohol for 24 hours before each visit to the unit for the duration of the study.
• Where participation in the study would result in donation of blood or blood products in excess of 500 mL within a 56 day period.
• The subject has a positive drug/alcohol screen on the test day. A minimum list of drugs that will be screened for include amphetamines, barbiturates, cocaine, opiates, cannabinoids and benzodiazepines.