Preexposure prophylaxis comprehension and the certainty of willingness to use preexposure prophylaxis among men who have sex with men in China.

Preexposure prophylaxis (PrEP) is not available in China and the willingness to use PrEP among Chinese men who have sex with men (MSM) is not clear. The aim of this study was to better understand the association between PrEP comprehension and the willingness to use PrEP under varying conditions among MSM. An online survey investigating personal characteristics, PrEP comprehension, and PrEP willingness among MSM was conducted. A third of respondents (36.2%, 196 out of 541) reported that they would like to use PrEP. Compared with MSM with a basic level of PrEP comprehension, MSM with a high level were more likely to report clear choices: a willingness or unwillingness to use PrEP (82.4% versus 65.7%, p <0.01). Among 350 MSM willing to use PrEP or uncertain about uptake, those with a high level of PrEP comprehension were more likely to use PrEP daily (adjusted odds ratio [AOR] = 1.71, 95% confidence interval 1.04-2.80), and to use PrEP with mild or other side effects (AOR = 2.72 or 2.77). A high level of PrEP comprehension is a key factor in urging MSM to use PrEP under varying conditions. Our findings call attention to the need for health education to improve PrEP comprehension.