According to CURB-65 score

Low severity CAP- oral amoxicillin 5 days

If penicillin allergic- macrolide/tetracycline

Moderate severity CAP- amoxicillin + macrolide 7-10 days

High severity CAP- IV co-amoxiclav/ceftriaxone/piperacillin + tazobactam

CAP-

Atypical- clarithromycin (avoid in long QT syndrome, use erythromycin in pregnant women)

Typical- amoxicillin/co-amoxiclav

Severe- piperacillin-tazobactam

Levofloxacin if cannot tolerate ^

HAP-

<5 days- co-amoxiclav (can cause cholestasis- high BR & ALP)

5 days- tazocin

Pneumocystic jiroveci- co-trimoxazole

Aspiration pneumonia- amoxicillin + metronidazole

MRSA- vancomycin

Legionella pneumonia- oral clarithromycin