Evaluation Of The Efficacy And Safety Of Single Doses Of PF-05089771 In Patients With Primary (Inherited) Erythromelalgia

Inclusion Criteria: * Male and or female subjects between the ages of 18-78 years * Subject has clinical signs of IEM * Minimum BMI 17.5kg/m2 and total body weight \>50kg Exclusion Criteria: * Other severe pain conditions, e.g. rheumatologic, that may impair subject's self-assessment of pain due to IEM. * Evidence of clinically significant hypertension, clinically significant hematological, dermatological, renal, endocrine (except diabetes mellitus), pulmonary, gastrointestinal, cardiovascular, hepatic, neurological (other than IEM), or allergic disease (including drug allergies but excluding untreated asymptomatic seasonal allergies). * Subjects with severe obesity.