Participant will take the study drug/placebo every day for 4 weeks starting the morning after participant has enrolled in this study. Participant will take the study drug/placebo in the morning with a full glass (8 ounces) of water. Participant may take the study drug/placebo with or without food. If the dose causes an upset stomach, participant should take it with food. If participant has trouble swallowing the dose of study drug/placebo, the study staff will tell participant of different ways of taking it. Participant will be given a pamphlet with more information about how to take the study drug/placebo.