Can amoxicillin be used to treat malaria?

Treatment of Malaria

Malaria, especially Falciparum malaria, is a medical emergency that requires a hospital stay. Chloroquine is often used as an anti-malarial medication. However, chloroquine-resistant infections are common in some parts of the world.

Possible treatments for chloroquine-resistant infections include:

The combination of quinidine or quinine plus doxycycline, tetracycline, or clindamycin
Atovaquone plus proguanil (Malarone)
Mefloquine or artesunate
The combination of pyrimethamine and sulfadoxine (Fansidar)
The choice of medication depends in part on where you were when you were infected.

Medical care, including fluids through a vein (IV) and other medications and breathing (respiratory) support may be needed.

https://www.drugs.com/health-guide/malaria.html
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List of medications:

https://www.drugs.com/condition/malaria.html

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Amoxicillin is used in the treatment of urinary tract infection; bacterial infection; bladder infection; bronchitis; upper respiratory tract infection , and belongs to the drug class aminopenicillins.

Amoxicillin is associated with the treatment of:
Actinomycosis
Anthrax Prophylaxis
Bacterial Endocarditis Prevention
Bronchiectasis
Chlamydia Infection
Cutaneous Bacillus anthracis
Dental Abscess
Helicobacter Pylori Infection
Lyme Disease, Arthritis
Lyme Disease, Carditis
Lyme Disease, Erythema Chronicum Migrans
Lyme Disease, Neurologic
Otitis Media
Pneumonia
Sinusitis
Skin Infection
Tonsillitis/Pharyngitis

Take care,

Malaria is not caused by a bacteria, but a parasite. As such, an anti biotic, which kills bacteria, would be of little use. He either does not have malaria, or the attack subsided spontaneously. He most definately is not cured if he only took amoxicillin. Malaria waxes and wanes, its not a once and its done type disease.