This study was designed is to examine the idea that GW679769 has an effect on three of the pathophysiological disturbances reported in patients with Functional Dyspepsia (FD): impaired stomach accommodation to a meal, delayed stomach emptying, and visceral hypersensitivity to distension.

An exploratory study to investigate the effects of the NK1 antagonist GW679769, 120 mg once daily for 4 days, on gastric accommodation, gastric emptying and gastric distension-induced perception and discomfort in adult male and female patients with functional dyspepsia, in a single-centre, placebo-controlled, double-blind, randomised, two-period crossover study

Inclusion criteria:

• Functional dyspepsia as diagnosed according to the Rome II criteria
• Must had a one month trial (full dose) of proton pump inhibitor treatment within the last 6 months, during a symptomatic period, that produced no lasting response, although this may not be required for those patients who have no symptoms of heartburn and do not present pain-predominant dyspepsia symptoms. Such decision will be left to the Principal Investigator's discretion.
• Patients who are non-smokers or smokers who smoke up to 20 cigarettes per day

Exclusion criteria:

• Active or history of peptic ulcer disorder
• History of major abdominal surgery
• History of underlying psychiatric illness, or current active psychiatric morbidity
• Pregnant or nursing women