Spaghetti plot of vaginal clindamycin concentrations versus time (PK full set): a) linear scale, b) semilogarithmic scale. BLQ, below the LLOQ; ND, not detectable. Day 1 is the day of dosing. Day 2 is 24 h after dosing. Day 3 is 48 h after dosing. BLQ values prior to the first measurable concentration are set to zero (0). All other BLQ and ND values are set as missing. Red solid line represents the average profile (geometric mean).