The anti-HIV procedure, PrEP (pre-exposure prophylaxis), is showing promising results according to a British study.

Proud Clinics is conducting the trial in co-operation with England’s Public Health department. The trial consists of one Truvada pill daily. Results from this British study indicate PrEP is effective against the HIV virus.

Proud Clinics enrolled 545 participants in the study who were randomly assigned treatment programs, consisting of Truvada or another placebo. All participants were offered regular HIV testing as well as testing for other sexually transmitted diseases and information on safe-sex practices.

Proud Clinics hailed the results in an interim analysis, stating its PrEP findings are “highly protective against HIV for gay men and other men who have sex with men in the U.K.”

Results of the British study were announced Oct. 16, 2014.