To address the lack of data on male genital tract penetration of CAB-LA PrEP, seminal plasma was collected at days 3, 7, 28, 84, and 140 and analyzed by LC-MS/MS. CAB was detectable in 71% of samples at day 3, 73% at day 7, and 92% at day 28, with all samples quantifiable at days 84 and 140. Seminal-to-blood plasma ratios remained low but proportional to systemic exposure, indicating sustained seminal CAB exposure.
Seminal plasma concentrations of long-acting cabotegravir in men receiving HIV pre-exposure prophylaxis
D'Avolio, Antonio;
2026-01-01
Abstract
To address the lack of data on male genital tract penetration of CAB-LA PrEP, seminal plasma was collected at days 3, 7, 28, 84, and 140 and analyzed by LC-MS/MS. CAB was detectable in 71% of samples at day 3, 73% at day 7, and 92% at day 28, with all samples quantifiable at days 84 and 140. Seminal-to-blood plasma ratios remained low but proportional to systemic exposure, indicating sustained seminal CAB exposure.
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