Terconazole is a prescription antifungal medication used to treat vaginal yeast infections (vulvovaginal candidiasis). It belongs to the triazole class of antifungals and comes as a vaginal cream or suppository, applied once daily at bedtime for either three or seven days depending on the formulation. Unlike some over-the-counter yeast infection treatments, terconazole requires a prescription.
How Terconazole Works
Yeast cells, particularly Candida species, rely on a compound called ergosterol to keep their cell membranes intact. Terconazole blocks a specific step in the production of ergosterol, essentially punching holes in the yeast cell’s outer barrier. Without a functional membrane, the yeast can’t survive.
What makes terconazole useful is its selectivity. It targets the fungal version of the enzyme responsible for ergosterol production while having very little effect on similar enzymes in human cells. This means it kills yeast effectively without causing much disruption to your own tissue.
Available Forms and Treatment Length
Terconazole comes in three formulations, each with a different strength and treatment duration:
- 0.4% vaginal cream: One full applicator (5 grams, delivering 20 mg of terconazole) inserted at bedtime for seven consecutive nights.
- 0.8% vaginal cream: One full applicator (5 grams, delivering 40 mg of terconazole) inserted at bedtime for three consecutive nights.
- 80 mg vaginal suppository: One suppository inserted at bedtime for three consecutive nights.
The three-day options use a higher dose per application, while the seven-day option spreads a lower dose over a longer period. Your doctor will choose based on the severity of your infection and your preference. All three are applied once daily at bedtime so the medication stays in place overnight.
How Well It Works
In a clinical trial comparing terconazole suppositories to oral fluconazole (a commonly prescribed pill for yeast infections), terconazole performed comparably. At the one- to two-week follow-up, 81% of women using terconazole were clinically cured, compared to about 76% using fluconazole. The fungus itself was eliminated in roughly 79% of the terconazole group versus 71% in the fluconazole group. By the 30- to 35-day mark, cure rates in both groups settled to around 60%, which is typical since some women experience recurrence. The differences between the two treatments were not statistically significant, meaning terconazole works about as well as the oral alternative for severe infections.
Common Side Effects
The most frequently reported side effect is headache, which occurred in about 21% of women using the 0.8% cream in clinical trials. That number is higher than many people expect from a vaginal medication, but it’s well documented. Other side effects reported at lower rates include:
- Menstrual cramps: About 6% of users
- Genital burning and itching: About 5% of users
- Abdominal pain: About 3.4% of users
- Fever: Less than 2% of users
Some local irritation, like burning or itching at the application site, can be hard to distinguish from the yeast infection symptoms you’re already dealing with. These side effects typically resolve on their own as you continue or complete treatment.
Latex Condoms and Diaphragms
The base ingredients in terconazole suppositories can weaken rubber and latex products. If you use latex condoms or a diaphragm for birth control, do not use them during the course of treatment. The suppository formulation can damage these products, potentially causing them to fail. The prescribing information does not specify a waiting period after finishing treatment, so ask your doctor when it’s safe to resume using latex-based contraceptives. The cream formulation carries the same general caution.
What to Expect During Treatment
You’ll use terconazole at bedtime each night for the full course, whether that’s three nights or seven. It’s important to complete the entire treatment even if your symptoms improve after the first day or two. Stopping early increases the chance of the infection coming back.
You’ll likely notice symptom relief within the first couple of days, particularly less itching and discharge. The cream formulation is water-washable, so some leakage is normal. Many women find wearing a panty liner helpful during treatment. If your symptoms haven’t improved after completing the full course, or if they return within two months, you may need further evaluation to confirm the diagnosis or explore a different treatment approach.