Efficacy of Pregabalin on Chronic Cough

Inclusion Criteria: * Diagnosis of non-asthmatic chronic cough defined as a cough experienced for a period of at least 8 weeks * Negative methacholine challenge (within past year) * Chest x-ray with absence of gross abnormality that could justify the cough or be a cause for the cough (within past 6 months) * Male or female 18 years or older * Willing and able to limit to 1 or less alcohol beverage per day (example: 360 ml of beer or 330 ml of cooler or 120 ml of wine) Exclusion Criteria: * Concurrent use of Gabapentin or Pregabalin for other indications (seizure disorder, chronic pain) * History of allergy / intolerance or adverse effect with Gabapentin or Pregabalin. * Concurrent use of central nervous system depressants (i.e. opioids or benzodiazepines) * Not able to limit daily alcohol intake as recommended in the inclusion criteria * Creatinine clearance \< 60ml/min within past three months * Current Smoker or has been quit less than 8 weeks * Symptoms of post nasal drip * History of gastroesophageal reflux. Only participants with untreated Gastroesophageal Reflux Disease (GERD) or less than 8 weeks of therapy will be excluded. * Symptoms of upper airway cough syndrome * ACE inhibitor use * Allergy to citric acid * Pregnant or nursing women * History of angioedema or congestive heart failure