Ar, a brand name for a formulation containing essential Artemether + Lumefantrine, is widely used for various health benefits. This guide provides comprehensive information on the uses, dosage, side effects, and mechanism of action of Ar, as well as insights into how long it takes to work. Understanding these aspects can help you make informed decisions about its use and effectiveness.

What is Ar?

Ar (also known as Coartem or artemether + lumefantrine combination) is a combination medication used to treat malaria. It is a fixed-dose combination of two drugs, artemether (an antimalarial drug) and lumefantrine (a lipophilic allylamine).

Uses For Ar

Ar is used to help treat infected individuals with malaria and to reduce the spread of malaria in areas with a high infection rate. It may also be used to help treat recurrent acute attacks of malaria and lessen the severity of symptoms.

Mechanism of Action

Ar works by interfering with the DNA of the Plasmodium parasite and blocking its growth. Artemether affects the building of the parasite's cell membrane and lumefantrine stops the spread of the parasites.

How Long Does it Take to Work?

Ar starts to take effect within 2 days. However, it may take up to 2 weeks to clear the infection and up to 4 weeks for full recovery.


Ar is rapidly and almost completely absorbed from the gastrointestinal tract.

Route of Elimination

Ar is primarily eliminated by the kidneys, although it may also be eliminated through bile or feces.


The recommended dose for Ar is 4 tablets twice daily, with food, for 3 days.


Ar should be taken with food for maximum effectiveness.

Side Effects

The most common side effects of Ar include nausea, abdominal pain, vomiting, and diarrhea. Other side effects may include anorexia, dizziness, headache, drowsiness, rash, pruritus, and insomnia.


The toxicity of Ar is low. There have been reports of adverse events related to taking the combination medication, such as nausea, vomiting, and abdominal discomfort.


Patients should inform their healthcare provider of any history of liver or kidney diseases, allergies, or other medical conditions before taking Ar.


Ar may interact with other medications, including antacids, barbiturates, anticoagulants, penicillins, and phenytoin.

Disease Interaction

Ar is not recommended for use in patients with severe renal impairment.

Drug Interaction

Ar may interact with certain drugs, including cimetidine, ranitidine, phenobarbital, and rifabutin.

Food Interactions

Food may decrease the absorption of Ar. It is best taken with food.

Pregnancy Use

Ar may be used during pregnancy.

Lactation Use

Ar is not recommended for use in breastfeeding women.

Acute Overdose

If an overdose occurs, it is important to seek medical attention immediately. Symptoms of an acute overdose may include nausea, vomiting, and abdominal pain.


Ar is contraindicated in patients with a known hypersensitivity to any components of the medication.

Use Direction

Ar should be taken as prescribed by a healthcare provider.

Storage Conditions

Ar should be stored at room temperature in a cool, dry place.

Volume of Distribution

The volume of distribution of Ar is estimated to be 0.91 L.


The estimated half-life of Ar is 11 - 14 hours.


The estimated clearance of Ar is 0.28 L/hr.

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