- Blood (about 2 teaspoons each time) will be collected for PK testing before you take the first daily dose of the study drug and then 1, 2, 4, 6, and 8 hours later. Additional blood (about 2 teaspoons each time) will also be collected for PK testing before you take the second daily dose of the study drug and then 1, 2, 4, and 12 hours later.