Microbicides are compounds that can be applied inside the vagina or rectum to
protect against sexually transmitted infections, including HIV.
They can be formulated as gels, creams, films, or suppositories. Microbicides
may or may not have spermicidal activity (contraceptive effect)
At present, an [entirely] effective microbicide is not available.
To read about this term in context:
GreenFacts Summary on AIDS status & challenges of the epidemic: