Study to Evaluate ATP-induced Pain and ATP-induced Dermal Vasodilation by Iontophoresis (0000-118)(COMPLETED)

Inclusion Criteria: * Subject is in generally good health * Subject is willing to abstain from smoking within 24 hours of each iontophoresis treatment and limit smoking to 5 or less cigarettes per week during the study Exclusion Criteria: * Subject has a history of dermatitis, psoriasis, or eczema * Subject has active asthma and/or hay fever at the time of the screening visit * Subject is unable to refrain from use of analgesics within 3 days prior to each treatment period