Use of herbal medicinal products among patients in primary health care in a Brazilian southeastern city: evidence from the Prover project.

Objective: To determine the prevalence and factors associated with herbal medicinal product use among primary healthcare patients in southeastern Brazil.

Methods: A cross-sectional study combined with documentary research was conducted between August and November 2017, involving interviews with 1,221 adults following dispensing from primary healthcare units. The characterization of herbal medicinal product usage included assessing the prevalence, redundancy, and interaction indicators, as well as identifying sources of recommendation and acquisition.