evidence: Period blood, for example, is slightly alkaline and can raise levels temporarily (they return to normal after menstruation ends).Taking antibiotics: These medications raise pH levels because they kill all bacteria in your body, including good bacteria.Using hygiene products: Certain products intended to clean the vagina or improve its smell can increase pH levels by altering the vagina's microbiome. An example is douching, which involves using a tool to insert a liquid into the vagina.Sexual activity: Bacteria can be introduced through sexual intercourse or other sexual activity, raising pH levels. Semen is alkaline, so semen in the vagina can temporarily increase the pH. Some lubricants also have a higher pH, which can increase vaginal pH levels. How to Balance Vaginal pH If you think you have an infection stemming from an unbalanced vaginal pH, over-the-counter creams or ointments may help. Your doctor may also prescribe medication that you can apply or take in pill form.