There is this two year old boy who was diagnosed with malaria at a clinic. he was given drugs which did not work and so a bigger hospital gave him this latest malaria tablets. After 2 days he had to be admitted cause they also seemed not to work. he was injected high doses for 3days after which he was discharged yesterday. now the child is urinating very yellow urine(unusual) and it seems to burn him while urinating. What could be causing this despite lots of water drinking. no blood test could be done because he had already taken drugs. What could be the issue here?

The kidney is the main organ in the urinary system, which that said it is responsible for filtering and distributing all of the waste products and drug products to parts of the body. This could be why the drugs seemed not to work.

While this may explain half of the symptoms the pain felt during urination could be a result of a uninary tract infection.

I'm not sure if that helps you much but i would consider looking at how malaria impacts on the kidneys/urinary tract

It would help if you know the names of the medicines he was given.

And there is no reason why he cannot have a blood test to determine if he is hemolysing or is hyperbilirubinemic.

May just be clearing the medicine. You might want to go back to the doctor and see if the color is due to some hemoglobin breakdown product, liver damage, etc.