Data demonstrates concentrated cabotegravir levels in seminal plasma during HIV pre-exposure prophylaxis, suggesting effective genital tract penetration.
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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Moschese et al. (2026) studied this question.
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