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Metronidazole Gel Prescribing Information

Package insert / product label
Dosage form: topical gel
Drug classes: Topical anti-rosacea agents, Vaginal anti-infectives

Medically reviewed by Drugs.com. Last updated on Jan 3, 2024.

Highlights of Prescribing Information

These highlights do not include all the information needed to use METRONIDAZOLE GEL safely and effectively. See full prescribing information for METRONIDAZOLE GEL.

METRONIDAZOLE gel, for topical use.
Initial U.S. Approval: 1963

Indications and Usage for Metronidazole Gel

Metronidazole gel, 1% is a nitroimidazole indicated for the topical treatment of inflammatory lesions of rosacea (1)

Metronidazole Gel Dosage and Administration

  • Not for oral, ophthalmic or intravaginal use. (2)
  • Cleanse treated areas before the application of metronidazole gel. (2)
  • Apply and rub in a thin film of metronidazole gel once daily to affected area(s). (2)
  • Cosmetics may be applied after the application of metronidazole gel. (2)

Dosage Forms and Strengths

Gel, 1%. (3)

Contraindications

Metronidazole gel is contraindicated in those patients with a history of hypersensitivity to metronidazole or to any other ingredient in this formulation. (4)

Warnings and Precautions

  • Neurologic Disease: Peripheral neuropathy, characterized by numbness or paresthesia of an extremity has been reported in patients treated with systemic metronidazole. Peripheral neuropathy has been reported with the post approval use of topical metronidazole. The appearance of abnormal neurologic signs should prompt immediate reevaluation of metronidazole gel therapy. (5.1)
  • Blood Dyscrasias: Metronidazole is a nitroimidazole and should be used with care in patients with evidence of, or history of, blood dyscrasia. (5.2)
  • Contact Dermatitis: If dermatitis occurs, patients may need to discontinue use. (5.3)
  • Eye Irritation: Topical metronidazole has been reported to cause tearing of the eyes. Therefore, avoid contact with the eyes. (5.4)

Adverse Reactions/Side Effects

Most common adverse reactions (incidence > 2%) are nasopharyngitis, upper respiratory tract infection, and headache. (6)

To report SUSPECTED ADVERSE REACTIONS, contact Alembic Pharmaceuticals, Inc. at 1-866-210-9797 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.

Drug Interactions

Oral metronidazole has been reported to potentiate the anticoagulant effect of coumarin and warfarin, resulting in a prolongation of prothrombin time. Use caution when administering metronidazole gel concomitantly to patients who are receiving anticoagulant treatment. (7)

Use In Specific Populations

  • Lactation: Breastfeeding not recommended. (8.2)

See 17 for PATIENT COUNSELING INFORMATION.

Revised: 12/2023

Full Prescribing Information

1. Indications and Usage for Metronidazole Gel

Metronidazole gel, 1% is indicated for the topical treatment of inflammatory lesions of rosacea.

2. Metronidazole Gel Dosage and Administration

For topical use only, not for oral, ophthalmic, or intravaginal use.

Cleanse treated areas before the application of metronidazole gel.

Apply and rub in a thin film of metronidazole gel once daily to affected area(s).

Cosmetics may be applied after the application of metronidazole gel.

3. Dosage Forms and Strengths

Gel, 1%. Metronidazole gel USP is a clear, colorless to pale yellow gel. Each gram of metronidazole gel USP contains 10 mg (1%) of metronidazole USP.

4. Contraindications

Metronidazole gel is contraindicated in patients with a history of hypersensitivity to metronidazole or to any other ingredient in the formulation.

5. Warnings and Precautions

5.1 Neurologic Disease

Peripheral neuropathy, characterized by numbness or paresthesia of an extremity, has been reported in patients treated with systemic metronidazole. peripheral neuropathy has been reported with the post approval use of topical metronidazole. The appearance of abnormal neurologic signs should prompt immediate reevaluation of metronidazole gel therapy. Metronidazole should be administered with caution to patients with central nervous system diseases.

5.2 Blood Dyscrasias

Metronidazole is a nitroimidazole; use with care in patients with evidence of, or history of, blood dyscrasia.

5.3 Contact Dermatitis

Irritant and allergic contact dermatitis have been reported with metronidazole gel. If dermatitis occurs, patients may need to discontinue use.

5.4 Eye Irritation

Topical metronidazole has been reported to cause tearing of the eyes. Avoid contact with the eyes.

6. Adverse Reactions/Side Effects

6.1 Clinical Trials Experience

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.

In a controlled clinical trial, 557 subjects used metronidazole gel, 1% and 189 subjects used the gel vehicle once daily for up to 10 weeks. The following table summarizes selected adverse reactions that occurred at a rate of ≥1%:

Table 1: Adverse Reactions That Occurred at a Rate of ≥1%
System Organ Class/Preferred Term
Metronidazole Gel, 1%
Vehicle

N= 557
N= 189
Patients with at least one AE
Number (%) of Patients
186 (33.4)
51 (27.0)
Infections and infestations
76 (13.6)
28 (14.8)
Bronchitis
6 (1.1)
3 (1.6)
Influenza
8 (1.4)
1 (0.5)
Nasopharyngitis
17 (3.1)
8 (4.2)
Sinusitis
8 (1.4)
3 (1.6)
Upper respiratory tract infection
14 (2.5)
4 (2.1)
Urinary tract infection
6 (1.1)
1 (0.5)
Vaginal mycosis
1 (0.2)
2 (1.1)
Musculoskeletal and connective tissue disorders
19 (3.4)
5 (2.6)
Back pain
3 (0.5)
2 (1.1)
Neoplasms
4 (0.7)
2 (1.1)
Basal cell carcinoma
1 (0.2)
2 (1.1)
Nervous system disorders
18 (3.2)
3 (1.6)
Headache
12 (2.2)
1 (0.5)
Respiratory, thoracic and mediastinal disorders
22 (3.9)
5 (2.6)
Nasal congestion
6 (1.1)
3 (1.6)
Skin and subcutaneous tissue disorders
36 (6.5)
12 (6.3)
Contact dermatitis
7 (1.3)
1 (0.5)
Dry skin
6 (1.1)
3 (1.6)
Vascular disorders
8 (1.4)
1 (0.5)
Hypertension
6 (1.1)
1 (0.5)
Table 2: Local Cutaneous Signs and Symptoms of Irritation That Were Worse Than Baseline
Metronidazole Gel, 1%
Vehicle
Sign/Symptom
N= 544
N= 184
Dryness
138 (25.4)
63 (34.2)
Mild
93 (17.1)
41 (22.3)
Moderate
42 (7.7)
20 (10.9)
Severe
3 (0.6)
2 (1.1)
Scaling
134 (24.6)
60 (32.6)
Mild
88 (16.2)
32 (17.4)
Moderate
43 (7.9)
27 (14.7)
Severe
3 (0.6)
1 (0.5)
Pruritus
86 (15.8)
35 (19.0)
Mild
53 (9.7)
21 (11.4)
Moderate
27 (5.0)
13 (7.1)
Severe
6 (1.1)
1 (0.5)
Stinging/burning
56 (10.3)
28 (15.2)
Mild
39 (7.2)
18 (9.8)
Moderate
7 (1.3)
9 (4.9)
Severe
10 (1.8)
1 (0.5)

The following additional adverse experiences have been reported with the topical use of metronidazole: transient redness, metallic taste, tingling or numbness of extremities, and nausea.

6.2 Post marketing Experience

The following adverse reaction has been identified during post-approval use of topical metronidazole. Because this reaction is reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate the frequency or establish a causal relationship to drug exposure.

Nervous System Disorders: Peripheral neuropathy [see Warnings and Precautions (5.1)]

7. Drug Interactions

Oral metronidazole has been reported to potentiate the anticoagulant effect of coumarin and warfarin, resulting in a prolongation of prothrombin time. Drug interactions should be kept in mind when metronidazole gel is prescribed for patients who are receiving anticoagulant treatment, although they are less likely to occur with topical metronidazole administration because of low absorption.

8. Use In Specific Populations

8.1 Pregnancy

Risk Summary

Available data have not established an association with metronidazole use during pregnancy and major birth defects, miscarriage or other adverse maternal or fetal outcomes. No fetotoxicity was observed after oral administration of metronidazole in pregnant rats or mice. The available data do not allow the calculation of relevant comparisons between the systemic exposures of metronidazole observed in animal studies to the systemic exposures that would be expected in humans after topical use of metronidazole gel.

The background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2 to 4% and 15 to 20%, respectively.

8.2 Lactation

Risk Summary

It is not known whether metronidazole is present in human milk after topical administration. Published literature reports the presence of metronidazole in human milk after oral administration. There are reports of diarrhea and candida infection in breastfed infants of mothers receiving oral treatment with metronidazole. There are no data on the effects of metronidazole on milk production. Because of the potential for serious adverse reactions, advise patients that breastfeeding is not recommended during treatment with metronidazole gel.

8.4 Pediatric Use

Safety and effectiveness in pediatric patients have not been established.

8.5 Geriatric Use

Sixty-six subjects aged 65 years and older were treated with metronidazole gel, 1% in the clinical study. No overall differences in safety or effectiveness were observed between these subjects and younger subjects, and other reported clinical experience has not identified differences in responses between the elderly and younger patients, but greater sensitivity of some older individuals cannot be ruled out.

11. Metronidazole Gel Description

Metronidazole gel USP, 1% contains metronidazole, USP. It is intended for topical use. Chemically, metronidazole is 2-methyl-5-nitro-1 H-imidazole-1-ethanol. The molecular formula for metronidazole is C6H9N3O3. It has the following structural formula:

Image

Metronidazole has a molecular weight of 171.16. It is a white to pale yellow crystalline powder. It is slightly soluble in alcohol and has solubility in water of 10 mg/mL at 20˚C. Metronidazole belongs to the nitroimidazole class of compounds.

Metronidazole gel USP, 1% is a clear, colorless to pale yellow, aqueous gel; each gram contains 10 mg of metronidazole in a base of betadex, edetate disodium, hydroxyethyl cellulose, methylparaben, niacinamide, phenoxyethanol, propylene glycol, propylparaben and purified water.

12. Metronidazole Gel - Clinical Pharmacology

12.1 Mechanism of Action

The mechanism of action of metronidazole in the treatment of rosacea is unknown.

12.2 Pharmacodynamics

The pharmacodynamics of metronidazole in association with the treatment of rosacea are unknown.

Cardiac Electrophysiology: The effect of metronidazole gel on the QTc interval has not been adequately characterized.

12.3 Pharmacokinetics

Topical administration of a one-gram dose of metronidazole gel to the face of 13 subjects with moderate to severe rosacea once daily for 7 days resulted in a mean ± SD Cmax of metronidazole of 32 ± 9 ng/mL. The mean ± SD AUC(0 to 24) was 595 ± 154 ng*hr/mL. The mean Cmax and AUC(0 to 24) are less than 1% of the value reported for a single 250 mg oral dose of metronidazole. The time to maximum plasma concentration (Tmax) was 6 to 10 hours after topical application.

13. Nonclinical Toxicology

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility

Metronidazole has shown evidence of carcinogenic activity in studies involving chronic oral administration in mice and rats, but not in studies involving hamsters.

In several long-term studies in mice, oral doses of approximately 225 mg/m2/day or greater were associated with an increase in pulmonary tumors and lymphomas. Several long-term oral studies in the rat have shown statistically significant increases in mammary and hepatic tumors at doses >885 mg/m2/day.

Metronidazole has shown evidence of mutagenic activity in several in vitro bacterial assay systems. In addition, a dose-related increase in the frequency of micronuclei was observed in mice after intraperitoneal injections. An increase in chromosomal aberrations in peripheral blood lymphocytes was reported in patients with Crohn's disease who were treated with 200 to 1200 mg/day of metronidazole for 1 to 24 months. However, in another study, no increase in chromosomal aberrations in circulating lymphocytes was observed in patients with Crohn's disease treated with the drug for 8 months.

14. Clinical Studies

In a randomized, vehicle-controlled trial, 746 subjects with rosacea were treated with metronidazole gel,1% or vehicle once daily for 10 weeks. Most subjects had a disease severity score of 3 ("moderate") on the 5-point Investigator Global Assessment (IGA) scale, with 8 to 50 inflammatory lesions and no more than two nodules at baseline. The co-primary efficacy endpoints were the percent reduction in inflammatory lesion counts and percentage of subjects with success on IGA, defined as an IGA score of 0 ("clear") or 1 ("almost clear") at Week 10.

The efficacy results are shown in the following table:

Table 3: Inflammatory Lesion Counts and Global Scores in a Clinical Trial of Rosacea
Metronidazole Gel, 1%
Vehicle
N
Results N (%)
N
Results N (%)
Inflammatory lesions
557
189
Baseline, mean count
18.3
18.4
Week-10, mean count
8.9
12.8
Reduction
9.4 (50.7)
5.6 (32.6)
Investigator Global Assessment
557
189
Subject clear or almost clear
214 (38.42)
52 (27.51)
Subject with no change
159 (28.5)
77 (40.7)

Subjects treated with metronidazole gel, 1% experienced a mean reduction of 9.4 inflammatory lesions in the Week-10 LOCF group, compared to a reduction of 5.6 for those treated with vehicle, or a difference in means of 3.8 lesions.

The contribution to efficacy of individual components of the vehicle has not been established.

16. How is Metronidazole Gel supplied

16.1 How supplied

Metronidazole gel USP, 1% is a clear, colorless to pale yellow in color, and supplied as follows:

45 gram tube- NDC 62332-630-45

60 gram tube- NDC 62332-630-60

55 gram pump- NDC 62332-630-55

16.2 Storage and handling

Storage Conditions: Store at 20˚ to 25˚C (68˚ to 77˚F); excursions permitted between 15˚ to 30˚C (59˚ to 86˚F) [see USP controlled room temperature].

17. Patient Counseling Information

Advise the Patient to read the FDA-approved patient labeling (Patient Information).

Administration Instructions

Use as directed. Avoid contact with the eyes.

Cleanse treated areas before the application of metronidazole gel.

Advise patients to report any adverse reaction to their healthcare providers.

Lactation

Advise women not to breastfeed during treatment with metronidazole gel [see Use in Specific Populations (8.2)].

Rx Only

Manufactured for:

Alembic Pharmaceuticals, Inc.

Bedminster, NJ 07921, USA

Manufactured by:

Alembic Pharmaceuticals Limited

(Derma Division),

Karakhadi, Vadodara 391450, India.

Mfg. License No.: G/25/2216

PATIENT INFORMATION

PATIENT INFORMATION
Metronidazole (MET-roe-NYE-da-zole) Gel, USP 1%
Important: Metronidazole gel is for use on the skin only (topical use). Do not use metronidazole gel in your mouth, eyes, or vagina.
What is Metronidazole gel ?
Metronidazole gel is a prescription medicine used on the skin (topical) to treat pimples and bumps (inflammatory lesions) caused by a condition called rosacea.
It is not known if metronidazole gel is safe and effective in children.
Do not use Metronidazole gel if you are allergic to metronidazole or any of the ingredients in metronidazole gel. See the end of this leaflet for a complete list of ingredients in metronidazole gel.
Before using Metronidazole gel , tell your healthcare provider about all your medical conditions, including if you:
  • have tingling or numbness in your hands or feet
  • have or have had a blood disorder or disease
  • are pregnant or plan to become pregnant. It is not known if metronidazole gel will harm your unborn baby.
  • are breastfeeding or plan to breastfeed. It is not known if metronidazole gel passes into your breast milk. Do not breastfeed during treatment with metronidazole gel. Talk to your healthcare provider about the best way to feed your baby during treatment with metronidazole gel.
Tell your healthcare provider about all of the medicines you take , including prescription and over-the-counter medicines, vitamins, and herbal supplements.
Know the medicines you take. Keep a list of them to show your healthcare provider and pharmacist when you get a new medicine.
How should I use Metronidazole gel ?
  • Use metronidazole gel exactly as your healthcare provider tells you to.
  • Cleanse the treated area before applying metronidazole gel.
  • Apply and rub in a thin film of metronidazole gel 1 time a day to the affected area(s).
  • You can apply cosmetics after applying metronidazole gel.
  • Avoid contact of metronidazole gel with your eyes.
What are the possible side effects of Metronidazole gel ?
Metronidazole gel may cause serious side effects, including:
  • Peripheral neuropathy. Tingling, burning, pain or numbness in the hands or feet (peripheral neuropathy) have happened in people treated with metronidazole used on the skin. Tell your healthcare provider if you experience tingling, burning, pain or numbness in your hands or feet during treatment with metronidazole gel.
  • Skin reactions, including allergic reactions. Tell your healthcare provider if you develop any skin reactions, including rash, itching, redness, swelling, or blisters during treatment with metronidazole gel.
  • Eye irritation. Tearing from eye irritation has happened in people treated with metronidazole used on the skin. Tell your healthcare provider if you experience tearing, redness or discomfort of the eyes during treatment with metronidazole gel.
The most common side effects of Metronidazole gel include:
  • sore throat and nasal congestion
  • upper respiratory tract infections
  • headache
Tell your healthcare provider if you get any side effects during treatment with metronidazole gel.
These are not all of the possible side effects of metronidazole gel.
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
You may also report side effects to Alembic Pharmaceuticals, Inc. at 1-866-210-9797.
How should I store Metronidazole gel ?
• Store metronidazole gel at room temperature between 68°F to 77°F (20°C to 25°C).
Keep Metronidazole gel and all medicines out of the reach of children.
General information about the safe and effective use of Metronidazole gel .
Medicines are sometimes prescribed for purposes other than those listed in a Patient Information leaflet. Do not use metronidazole gel for a condition for which it was not prescribed. Do not give metronidazole gel to other people, even if they have the same symptoms that you have. It may harm them. You can ask your pharmacist or healthcare provider for information about metronidazole gel that is written for health professionals.
What are the ingredients in Metronidazole gel ?
Active ingredient: metronidazole
Inactive ingredients: betadex, edetate disodium, hydroxyethyl cellulose, methylparaben, niacinamide, phenoxyethanol, propylene glycol, propylparaben and purified water
Manufactured for:
Alembic Pharmaceuticals, Inc.
Bedminster, NJ 07921, USA
Manufactured by:
Alembic Pharmaceuticals Limited
(Derma Division),
Karakhadi, Vadodara 391450, India.
Mfg. License No.: G/25/2216
For more information, call Alembic Pharmaceuticals, Inc. at 1-866-210-9797.

This Patient information has been approved by the U.S. Food and Drug Administration 12/2023

PACKAGE LABEL.PRINCIPAL DISPLAY PANEL

Metronidazole Gel USP, 1%

For Topical Use Only

NDC 62332-630-60

Rx Only

60 grams

For topical use only.

Not for oral, ophthalmic or intravaginal use.

Store at 20° to 25°C (68° to 77°F); excursions permitted between 15° to 30°C (59° to 86°F) [see USP Controlled Room Temperature]. Keep out of reach of children.

Usual dosage: Apply a thin film once a day to affected areas. See prescribing information for complete instructions.

Each gram contains: 10 mg (1%) metronidazole USP, as active ingredient in a gel base consisting of betadex, edetate disodium, hydroxyethyl cellulose, methylparaben, niacinamide, phenoxyethanol, propylene glycol, propylparaben, and purified water.

Manufactured for:

Alembic Pharmaceuticals, Inc.

Bedminster, NJ 07921, USA

Manufactured by:

Alembic Pharmaceuticals Limited

(Derma Division),

Karakhadi, Vadodara 391450, India.

Mfg. License No.: G/25/2216

label
carton label
METRONIDAZOLE
metronidazole gel
Product Information
Product TypeHUMAN PRESCRIPTION DRUGItem Code (Source)NDC:62332-630
Route of AdministrationTOPICAL
Active Ingredient/Active Moiety
Ingredient NameBasis of StrengthStrength
METRONIDAZOLE (UNII: 140QMO216E) (METRONIDAZOLE - UNII:140QMO216E) METRONIDAZOLE10 mg in 1 g
Inactive Ingredients
Ingredient NameStrength
BETADEX (UNII: JV039JZZ3A)
EDETATE DISODIUM (UNII: 7FLD91C86K)
METHYLPARABEN (UNII: A2I8C7HI9T)
NIACINAMIDE (UNII: 25X51I8RD4)
PHENOXYETHANOL (UNII: HIE492ZZ3T)
PROPYLENE GLYCOL (UNII: 6DC9Q167V3)
PROPYLPARABEN (UNII: Z8IX2SC1OH)
WATER (UNII: 059QF0KO0R)
HYDROXYETHYL CELLULOSE (4000 MPA.S AT 1%) (UNII: ZYD53NBL45)
Packaging
#Item CodePackage DescriptionMarketing Start DateMarketing End Date
1NDC:62332-630-451 in 1 CARTON09/06/2021
145 g in 1 TUBE; Type 0: Not a Combination Product
2NDC:62332-630-601 in 1 CARTON09/06/2021
260 g in 1 TUBE; Type 0: Not a Combination Product
3NDC:62332-630-551 in 1 CARTON09/06/2021
355 g in 1 BOTTLE, PUMP; Type 0: Not a Combination Product
Marketing Information
Marketing CategoryApplication Number or Monograph CitationMarketing Start DateMarketing End Date
ANDAANDA21264609/06/2021
Labeler - Alembic Pharmaceuticals Inc. (079288842)
Registrant - Alembic Pharmaceuticals Limited (650574663)
Establishment
NameAddressID/FEIBusiness Operations
Alembic Pharmaceuticals Limited871411532MANUFACTURE(62332-630) , ANALYSIS(62332-630)