Antibiotics save lives, but they can have a double-edged effect on vaginal flora. This is because antibiotics are not selective; while they eliminate harmful bacteria, they also reduce beneficial bacteria.
After antibiotic use, the number of Lactobacillus bacteria in the vagina often decreases. As a result, vaginal pH levels rise, making the vaginal environment more vulnerable. This is one of the main reasons why yeast infections are commonly seen after antibiotic treatment.
If vaginal itching, abnormal discharge, or odor appears during or shortly after antibiotic use, this usually indicates a temporary disruption of the vaginal flora. In some women, this imbalance resolves quickly. In others, it may lead to recurrent infections.
The risk increases when the effects of antibiotics combine with hormonal changes. For example, using antibiotics during menstruation or throughout the perimenopausal transition can make it harder for the vaginal flora to recover.
For this reason, vaginal symptoms following antibiotic use should not be dismissed as “normal.” The signals your body gives during this period deserve attention and, when necessary, medical evaluation.