Many medicines change the balance of bacteria that normally live in the vagina, which can cause vaginal symptoms. This is very common in women of childbearing age but can occur at any age. Vaginal symptoms caused by a medicine rarely lead to serious health problems, although the symptoms can be uncomfortable.

Medicines that may cause vaginal symptoms include:

• Antibiotics, such as penicillin and amoxicillin.
• Birth control pills.
• Hormone replacement therapy.
• Medicines used to treat cancer (chemotherapy).
• Vaginal sprays, douches, and spermicides.

Vaginal symptoms may clear up on their own once you stop taking a medicine. A yeast infection can be treated with a vaginal cream, tablet, or suppository.

If you think your vaginal symptoms may be caused by a medicine:

• Call the doctor who prescribed the medicine to determine whether you should stop taking it or take a different one. An appointment may not be necessary.
• If you are taking a nonprescription medicine, stop taking it. Call your doctor if you feel you need to continue taking the medicine.