1. Clinical Overview
A fixed-dose combination (FDC) tablet containing a triazole antifungal, a macrolide antibiotic, and a nitroimidazole antimicrobial. It is designed for the broad-spectrum treatment of mixed infections, particularly in gynecological and gastrointestinal contexts, where concurrent fungal, bacterial, and protozoal/anaerobic infections are suspected. Its use is controversial and should be guided by definitive diagnosis due to antimicrobial stewardship concerns.
| Onset | Duration | Bioavailability |
|---|---|---|
| Azithromycin: 2-3 hours; Fluconazole: 24-48 hours for symptom relief; Secnidazole: 1-2 hours. | Azithromycin: Prolonged tissue half-life provides 5-7 days of antimicrobial activity post-single dose; Fluconazole: Up to 72 hours for a single 150mg dose; Secnidazole: Up to 48-72 hours. | Fluconazole: ~90%; Azithromycin: ~37% (food decreases); Secnidazole: ~90%. |
2. Mechanism of Action
This combination exerts a triple-action effect by inhibiting fungal ergosterol synthesis (Fluconazole), inhibiting bacterial protein synthesis (Azithromycin), and causing cytotoxic damage to anaerobic bacteria/protozoa DNA (Secnidazole).
3. Indications & Uses
- Empirical treatment of Vaginal Discharge Syndrome (VDS) where mixed infection (bacterial vaginosis, trichomoniasis, vulvovaginal candidiasis) is suspected.
- Treatment of Mixed Pelvic Inflammatory Disease (PID) involving atypical pathogens and anaerobes.
- Management of persistent or recurrent gastrointestinal infections with suspected mixed bacterial/parasitic etiology.
4. Dosage & Administration
Adult Dosage: ONE single-dose tablet (Fluconazole 150mg + Azithromycin 500mg + Secnidazole 1000mg) taken orally as a single administration. For PID, Azithromycin component may be repeated after 7 days as per some protocols, but the FDC is typically a single dose.
Administration: Take as a single dose. Can be taken with or without food, but taking with food may reduce Azithromycin-related GI upset. Swallow whole with a full glass of water. Do not crush or chew.
5. Side Effects
Common side effects may include:
- Nausea, vomiting, abdominal pain, diarrhea, dyspepsia.
- Headache, dizziness.
- Altered taste (dysgeusia).
- Vaginal burning/itching (may be due to underlying condition).
6. Drug Interactions
| Drug | Effect | Severity |
|---|---|---|
| Warfarin | Fluconazole inhibits metabolism, increasing INR and bleeding risk. | Major |
| Cyclosporine, Tacrolimus | Fluconazole increases levels, risk of nephrotoxicity and neurotoxicity. | Major |
| Statins (Simvastatin, Atorvastatin) | Fluconazole increases levels, risk of myopathy/rhabdomyolysis. | Major |
| Phenytoin | Fluconazole increases levels; Phenytoin may decrease Fluconazole levels. | Major |
| Sulfonylureas (Glibenclamide) | Fluconazole increases levels, risk of hypoglycemia. | Major |
| Drugs prolonging QT (e.g., Amiodarone, Sotalol, Fluoroquinolones) | Additive risk of QTc prolongation and arrhythmia with Azithromycin. | Major |
| Antacids (Aluminum/Magnesium) | Reduce Azithromycin absorption; administer at least 2 hours apart. | Moderate |
| Disulfiram | Concurrent use with Secnidazole can cause acute psychosis and confusional state (disulfiram-like reaction). | Major |
| Alcohol | Can cause disulfiram-like reaction (nausea, vomiting, flushing, tachycardia) with Secnidazole. | Major |
| Rifampicin | Reduces Fluconazole levels significantly. | Major |
7. Patient Counselling
- DO take it as a single dose as prescribed. Do not repeat without doctor's advice.
- DO inform your doctor about all other medicines you are taking, including vitamins and herbals.
- DO complete any other medications prescribed as part of your treatment course.
- DO NOT consume ANY alcohol during treatment and for at least 3 full days (72 hours) after taking this tablet. Avoid alcohol-containing syrups/tonics.
- DO NOT take antacids within 2 hours of this medicine.
8. Toxicology & Storage
Overdose: Nausea, vomiting, diarrhea, severe abdominal pain. Lethargy, confusion, seizures (with Secnidazole). Hearing loss, QTc prolongation leading to arrhythmias. In extreme cases, hepatorenal failure.
Storage: Store below 30°C, in a cool, dry place. Protect from light and moisture. Keep out of reach of children. Do not use after the expiry date printed on the pack.