S.H.
Let the Doctor know.
Sometimes, they have to adjust the antibiotic... or prescribe another family of antibiotics. Some pneumonia strains don't respond to certain antibiotics.
But it has been only 2 days. Give it as directed... according to instructions. Very important. Also don't just stop giving it to him either.
Call the Doctor. Tell him/her what is happening... and see what he/she advises. That is what I would do. And plus because he has asthma.
I have asthma... and when/if I get Bronchitis or Pneumonia.. it can really affect the situation. Monitor him closely.
Does he have an inhaler? He should be on that too.
Give him lots of fluids... to keep the mucous thin.
But call the Doctor... and follow up.
take care,
Susan