Overview
11 DESCRIPTION Tinidazole USP is a synthetic antiprotozoal and antibacterial agent. It is 1-[2-(ethylsulfonyl)ethyl]-2-methyl-5-nitroimidazole, a second-generation 2-methyl-5-nitroimidazole, which has a molecular weight of 247.27 and the following chemical structure: Tinidazole pink oral tablets contain 250 mg or 500 mg of tinidazole USP.
Mechanism of Action
12 CLINICAL PHARMACOLOGY 12.1 Mechanism of Action Tinidazole is an antiprotozoal, antibacterial agent. [See Clinical Pharmacology (12.4) ]. 12.2 Pharmacodynamics Tinidazole exposure-response relationships and the time course of pharmacodynamics response are unknown. 12.3 Pharmacokinetics Absorption After oral administration, tinidazole is rapidly and completely absorbed. A bioavailability study of Tinidazole tablets was conducted in adult healthy volunteers. All subjects received a single oral dose of 2 g (four 500 mg tablets) of Tinidazole following an overnight fast. Oral administration of four 500 mg tablets of Tinidazole under fasted conditions produced a mean peak plasma concentration (C max ) of 47.7 (±7.5) µg/mL with a mean time to peak concentration (T max ) of 1.6 (±0.
Indications
- 1 INDICATIONS AND USAGE Tinidazole Tablet is a nitroimidazole antimicrobial indicated for: Trichomoniasis ( 1.1 ) Giardiasis: in patients age 3 and older ( 1.2 ) Amebiasis: in patients age 3 and older ( 1.3 ) Bacterial Vaginosis: in adult women ( 1.4, 8.1 ) To reduce the development of drug-resistant bacteria and maintain the effectiveness of Tinidazole Tablets and other antibacterial drugs, Tinidazole Tablets should be used only to treat or prevent infections that are proven or strongly suspected to be caused by bacteria (1.5) . 1.
Common Doses
- 2 g
- 50 mg
- 1 g
- 500 mg
Dosage
2 DOSAGE AND ADMINISTRATION Trichomoniasis: a single 2 g oral dose taken with food. Treat sexual partners with the same dose and at the same time ( 2.3 ) Giardiasis: Adults: a single 2 g dose taken with food. Pediatric patients older than three years of age: a single dose of 50 mg/kg (up to 2 g) with food ( 2.4 ) Amebiasis, Intestinal: Adults: 2 g per day for 3 days with food. Pediatric patients older than three years of age: 50 mg/kg/day (up to 2 g per day) for 3 days with food ( 2.5 ). Amebic liver abscess: Adults: 2 g per day for 3-5 days with food.
Black Box Warning
WARNING: POTENTIAL RISK FOR CARCINOGENICITY Carcinogenicity has been seen in mice and rats treated chronically with metronidazole, another nitroimidazole agent [see Nonclinical Toxicology ( 13.1 )]. Although such data have not been reported for tinidazole, the two drugs are structurally related and have similar biologic effects. Limit use of Tinidazole Tablets to approved indications only [see Indications and Usage ( 1.1 , 1.2 , 1.3 )]. Avoid chronic use [see Warnings and Precautions ( 5.1 )].
Contraindications
- 4 CONTRAINDICATIONS The use of tinidazole is contraindicated: In patients with a previous history of hypersensitivity to tinidazole or other nitroimidazole derivatives. Reported reactions have ranged in severity from urticaria to Stevens-Johnson syndrome [see Adverse Reactions ( 6.1 , 6.2 )]. In patients with Cockayne syndrome. Severe irreversible hepatotoxicity/acute liver failure with fatal outcomes have been reported after intiation of metronidazole, another nitroimidazole drug, structurally related to tinidazole, in patients with Cockayne syndrome [see Adverse Reactions ( 6.
Side Effects
- 6 ADVERSE REACTIONS Most common adverse reactions for a single 2 g dose of tinidazole (incidence >1%) are metallic/bitter taste, nausea, weakness/fatigue/malaise, dyspepsia/cramps/epigastric discomfort, vomiting, anorexia, headache, dizziness and constipation ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Rising Pharma Holdings, Inc. at 1-844-874-7464 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch 6.1 Clinical Studies Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly...
Interactions
- 7 DRUG INTERACTIONS Although not specifically identified in studies with tinidazole, the following drug interactions were reported for metronidazole, a chemically-related nitroimidazole. Therefore, these drug interactions may occur with tinidazole. The following drug interactions were reported for metronidazole, a chemically-related nitroimidazole and may therefore occur with tinidazole: Warfarin and other oral coumarin anticoagulants: Anticoagulant dosage may need adjustment during and up to 8 days after tinidazole therapy ( 7.