<qa>  What is the final visit to the study office?The final visit to the study office will occur either 6 weeks after the subjects last treatment visit OR when the subjects current cluster cycle ends, whichever comes first. At this visit, the study staff will collect and review the subjects diary as well as any unused study medication. The subject will be asked about any changes in medications and or medical conditions since their last contact with the site. The subject will also be asked about any unusual symptoms, or out of the ordinary experiences since their last contact with the site. The subject will be asked to report how they felt they responded to the study medication. The subjects vital signs will be measured and a blood sample 2 teaspoons will be obtained from a vein in their arm. 