Normal plasma levels vary between 1 and 2% over any given time.

Peak plasma levels occur at just over one hour after administration.

Peak plasma levels are achieved within 1 - 6 hours.

A positive test occurs if there is no decrease in plasma levels.

Peak plasma levels are achieved 30 minutes to 2 hours after oral administration.

A stable plasma level is only reached after three days of continuous application.

Peak plasma levels occur 0.3 to 2 hours after oral administration.

Plasma levels peak at 16 hours and the half-life of the drug is about 4 days.

Plasma levels are lower than I'd like, but they're holding steady.

Peak plasma levels are attained two hours after an oral dose.