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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.
The data described below reflect exposure to VANDAZOLE compared to another formulation of vaginal metronidazole in 220 women in a single trial. The population was non-pregnant females (age range 18 to 72 years, the mean was 33 years +/- 11 years) with bacterial vaginosis. The racial demographic of those enrolled was 71 (32%) of White, 143 (65%) of Black, 3 (1%) of Hispanic, 2 (1%) of Asian, and 1 (0%) of other. Patients administered an applicator full of VANDAZOLE (metronidazole vaginal gel) intravaginally once daily at bedtime for 5 days.
There were no deaths or serious adverse reactions related to drug therapy in the clinical trial. VANDAZOLE (metronidazole vaginal gel) was discontinued in 5 patients (2.3%) due to adverse reactions.
The incidence of all adverse reactions in VANDAZOLE (metronidazole vaginal gel) -treated patients was 42% (92/220). Adverse reactions occurring in ≥ 1% of patients were: fungal infection* (12%), headache (7%), pruritus (6%), abdominal pain (5%), nausea (3%), dysmenorrhea (3%), pharyngitis (2%), rash (1%), infection (1%), diarrhea (1%), breast pain (1%), and metrorrhagia (1%).
* Known or previously unrecognized vaginal candidiasis may present more prominent symptoms during therapy with VANDAZOLE (metronidazole vaginal gel) . Approximately 10% of patients treated with VANDAZOLE (metronidazole vaginal gel) developed Candida vaginitis during or immediately after therapy.
Additional uncommon events, reported by < 1% of those women treated with VANDAZOLE (metronidazole vaginal gel) included:
General: allergic reaction, back pain, flu syndrome, mucous membrane disorder, pain
Gastrointestinal: anorexia, constipation, dyspepsia, flatulence, gingivitis, vomiting
Nervous System: depression, dizziness, insomnia
Respiratory System: asthma, rhinitis
Skin and Appendages: acne, sweating, urticaria
Urogenital System: breast enlargement, dysuria, female lactation, labial edema, leucorrhea, menorrhagia, pyleonephritis, salpingitis, urinary frequency, urinary tract infection, vaginitis, vulvovaginal disorder
Other Metronidazole Formulations
Other Vaginal Formulations
Other reactions that have been reported in association with the use of other formulations of metronidazole vaginal gel include: unusual taste and decreased appetite.
Topical (Dermal) Formulations
Other reactions that have been reported in association with the use of topical (dermal) formulations of metronidazole include skin irritation, transient skin erythema, and mild skin dryness and burning. None of these adverse reactions exceeded an incidence of 2% of patients.
Oral and Parenteral Formulations
The following adverse reactions and altered laboratory tests have been reported with the oral or parenteral use of metronidazole:
Cardiovascular: Flattening of the T-wave may be seen in electrocardiographic tracings.
Nervous System: The most serious adverse reactions reported in patients treated with metronidazole have been convulsive seizures, encephalopathy, aseptic meningitis, optic and peripheral neuropathy, the latter characterized mainly by numbness or paresthesia of an extremity. In addition, patients have reported syncope, vertigo, incoordination, ataxia, confusion, dysarthria, irritability, depression, weakness, and insomnia. [see WARNINGS AND PRECAUTIONS]
Gastrointestinal: Abdominal discomfort, nausea, vomiting, diarrhea, an unpleasant metallic taste, anorexia, epigastric distress, abdominal cramping, constipation, “furry” tongue, glossitis, stomatitis, pancreatitis, and modification of taste of alcoholic beverages.
Genitourinary: Overgrowth of Candida in the vagina, dyspareunia, decreased libido, proctitis.
Hematopoietic: Reversible neutropenia, reversible thrombocytopenia.
Hypersensitivity Reactions: Urticaria; erythematous rash; Stevens-Johnson Syndrome, toxic epidermal necrolysis, flushing; nasal congestion; dryness of the mouth, vagina, or vulva; fever; pruritus; fleeting joint pains [see CONTRAINDICATIONS].
Renal: Dysuria, cystitis, polyuria, incontinence, a sense of pelvic pressure, darkened urine.
Read the Vandazole (metronidazole vaginal gel) Side Effects Center for a complete guide to possible side effects
The intravaginal administration of a single 5 gram dose of VANDAZOLE results in relatively lower mean systemic exposure to metronidazole that is approximately 2% to 5% of that achieved following a 500 mg oral dose of metronidazole [see CLINICAL PHARMACOLOGY]. The following drug interactions were reported for oral metronidazole.
Use of oral metronidazole has been associated with psychotic reactions in alcoholic patients who are using disulfiram concurrently. VANDAZOLE (metronidazole vaginal gel) should not be used by patients who have taken disulfiram within the last two weeks [see CONTRAINDICATIONS].
Use of oral metronidazole has been associated with a disulfiram-like reaction (abdominal cramps, nausea, vomiting, headaches, and flushing) to alcohol. Alcoholic beverages and preparations containing ethanol or propylene glycol should not be consumed during and for at least three days after VANDAZOLE therapy [see CONTRAINDICATIONS].
Coumarin and Other Oral Anticoagulants
Use of oral metronidazole has been reported to potentiate the anticoagulant effect of warfarin and other coumarin anticoagulants, resulting in a prolongation of prothrombin time. This possible drug interaction should be considered when VANDAZOLE (metronidazole vaginal gel) is prescribed for patients on this type of anticoagulant therapy. In patients on oral anticoagulants, consider monitoring prothrombin time, international normalized ratio (INR), and other coagulation parameters while on VANDAZOLE.
Short-term use of oral metronidazole has been associated with elevation of serum lithium concentrations and, in a few cases signs of lithium toxicity, in patients stabilized on relatively high doses of lithium. Use VANDAZOLE (metronidazole vaginal gel) with caution in patients treated with lithium and consider monitoring lithium serum concentrations while on VANDAZOLE.
Use of oral metronidazole with cimetidine may prolong the half-life and decrease plasma clearance of metronidazole. No dose adjustment of VANDAZOLE (metronidazole vaginal gel) is necessary.
Last reviewed on RxList: 4/4/2011
This monograph has been modified to include the generic and brand name in many instances.
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