Is metronidazole available as a vaginal suppository?

Metronidazole Vaginal Formulations

Yes, metronidazole is available as a vaginal gel formulation, not as a traditional suppository, though the term "suppository" has been used in research contexts to describe high-dose vaginal formulations.

Available Formulations

The FDA-approved intravaginal formulation of metronidazole is metronidazole vaginal gel 0.75%, delivered via applicator 1. This is the standard intravaginal preparation recommended in clinical guidelines for bacterial vaginosis treatment 2, 3, 2.

Standard Vaginal Gel

• Metronidazole gel 0.75%: One full applicator (5 g containing 37.5 mg metronidazole) intravaginally 1
• Recommended dosing: Once daily for 5 days or twice daily for 5 days 2, 3, 2
• This is an FDA-approved formulation specifically indicated for bacterial vaginosis 1

Research Formulations

While not standard FDA-approved products, research studies have investigated:

• High-dose metronidazole suppositories (750 mg) for recurrent bacterial vaginosis 4
• Metronidazole/miconazole combination suppositories (750 mg metronidazole/200 mg miconazole) for trichomoniasis 5
• Metronidazole pessaries (200 mg) used in some international settings 6

Clinical Context

The vaginal gel is the clinically recommended intravaginal formulation for bacterial vaginosis treatment in CDC guidelines 2, 3. The guidelines consistently list three recommended regimens:

1. Oral metronidazole 500 mg twice daily for 7 days
2. Metronidazole gel 0.75% intravaginally once daily for 5 days
3. Clindamycin cream 2% intravaginally at bedtime for 7 days

Important Caveats

• Metronidazole gel is NOT effective for trichomoniasis 2. Topical preparations are "considerably less efficacious" than oral metronidazole because they cannot achieve therapeutic levels in the urethra or perivaginal glands 2
• The gel achieves minimal systemic absorption (mean peak serum levels <2% of standard oral doses) 2, 1
• Avoid in pregnancy: Existing data do not support topical metronidazole use during pregnancy; oral therapy is preferred 3

Terminology Clarification

While research literature occasionally uses "suppository" or "pessary" to describe solid vaginal formulations of metronidazole 4, 7, 8, 6, the standard FDA-approved product in the United States is a gel formulation delivered via applicator, not a traditional suppository 1.