A Study To Evaluate The Safety And Tolerability Of Different Doses Of PF-03049423 In Healthy Adult Volunteers And Healthy Older Volunteers

PF-03049423 in oral solution, 2.5 mg, given once daily for 14 days; healthy young adult volunteers

PF-03049423 in oral solution, 7.5 mg, given once daily for 14 days; healthy young adult volunteers

PF-03049423 in oral solution, 6 mg, given once daily for 7 days, then 12 mg given once daily for 7 days; healthy young adult volunteers

PF-03049423 in oral solution, 3 mg, given once daily for 7 days, then 6 mg given once daily for 7 days; healthy elderly adult volunteers

PF-03049423 in oral solution, 5 mg, given once daily for 7 days, then 10 mg given once daily for 7 days; healthy elderly adult volunteers

Placebo in oral solution, given once daily for 14 days