1. Clinical Overview
Artemether-Lumefantrine is a fixed-dose combination antimalarial medication, classified as an Artemisinin-based Combination Therapy (ACT). It is the first-line treatment for uncomplicated Plasmodium falciparum malaria in India and globally, as per WHO and National Center for Vector Borne Diseases Control (NCVBDC) guidelines. Artemether provides rapid parasiticidal action, while lumefantrine eliminates residual parasites and prevents recrudescence.
| Onset | Duration | Bioavailability |
|---|---|---|
| Artemether: 2-4 hours for fever reduction; Lumefantrine: Slower, contributes to sustained effect. | Approximately 7 days, covering the parasite's life cycle. | Artemether: Variable, enhanced with fatty meals (up to 2-3 fold). Lumefantrine: Highly variable (4-11% fasting), significantly increased (up to 16-fold) with a high-fat meal. |
2. Mechanism of Action
The combination exerts a synergistic, multi-stage schizonticidal action. Artemether acts rapidly on the early blood stages (trophozoites) of the malaria parasite, causing a significant reduction in parasite biomass ('parasite clearance'). Lumefantrine acts more slowly on the later blood stages, eliminating residual parasites and preventing the development of resistance.
3. Indications & Uses
- Treatment of uncomplicated Plasmodium falciparum malaria
- First-line therapy for malaria in India as per NCVBDC guidelines
4. Dosage & Administration
Adult Dosage: Standard 6-dose regimen over 3 days for patients ≥35 kg: 4 tablets as a single initial dose, followed by 4 tablets again after 8 hours, then 4 tablets twice daily (morning and evening) on the second and third days. Total course: 24 tablets.
Administration: MUST be taken with food, preferably a fatty meal (e.g., milk, curd, full-fat dairy) to ensure adequate absorption of lumefantrine. If vomiting occurs within 1 hour of dosing, a repeat dose should be taken. Tablets can be crushed for children. Maintain adequate hydration.
5. Side Effects
Common side effects may include:
- Headache
- Dizziness
- Anorexia
- Nausea
- Abdominal pain
- Cough
- Palpitations
- Prolonged QT interval on ECG
- Arthralgia
- Myalgia
6. Drug Interactions
| Drug | Effect | Severity |
|---|---|---|
| Ketoconazole, Itraconazole, Voriconazole | Increased plasma concentrations of lumefantrine (CYP3A4 inhibition), increasing risk of QT prolongation. | Major |
| Rifampicin, Carbamazepine, Phenytoin, St. John's Wort | Markedly decreased plasma concentrations of both artemether and lumefantrine (CYP3A4 induction), leading to treatment failure. | Major |
| Antiretroviral Protease Inhibitors (e.g., Lopinavir/ritonavir) | Complex interaction; may increase lumefantrine levels. Monitor ECG. | Moderate |
| Macrolide antibiotics (e.g., Erythromycin, Clarithromycin) | Increased risk of QT prolongation. | Major |
| Quinine, Quinidine, Chloroquine | Additive risk of QT prolongation. Avoid concomitant use. | Major |
| Mefloquine | Increased risk of convulsions; administer sequentially (artemether-lumefantrine first, mefloquine after). | Moderate |
| Hormonal Contraceptives | Potential reduced efficacy of contraceptives; advise alternative non-hormonal methods during and for 1 month after treatment. | Moderate |
7. Patient Counselling
- DO take the medicine with food or milk. This is very important.
- DO complete the full 3-day course even if you feel better.
- DO inform your doctor about all other medicines you are taking.
- DO maintain good hydration.
- DONT take with grapefruit juice.
- DONT miss any doses. If you vomit within 1 hour, take the dose again.
- DONT take this medicine for prevention of malaria (prophylaxis).
8. Toxicology & Storage
Overdose: Nausea, vomiting, dizziness, syncope, QT interval prolongation leading to ventricular arrhythmias (torsades de pointes), headache, ataxia, convulsions.
Storage: Store below 30°C. Protect from light and moisture. Keep in the original blister pack until use. Keep out of reach of children.