You may consider taking a probiotic. Here's some information from Mayo Clinic
"There is good evidence supporting the use of L. acidophilus [a probiotic] or yogurt enriched with L. acidophilus for the treatment of vaginal infections. More evidence is needed to support the use of L. acidophilus in treating vaginal yeast infections such as candidiasis, as well as restoring microorganisms in the vagina after treatment for infections. Several studies have used L. acidophilus in combination with other probiotics or supplements, such as vitamin B."

For further reading:
http://www.mayoclinic.org/es-es/what-are-probiotics/art-20232589?pg=1
http://www.mayoclinic.org/drugs-supplements/acidophilus/evidence/hrb-20058615