Natrum Sulph

If it assumes the form of a severe bilious remittent fever, and there is excess of bile. Vomit greenish, yellow-brown or black.

Ferrum Phos

For the fever in alternation with the preceding. At the beginning of the attack.

Kali Phos

For collapse and depressed vital forces. Also for deep green, bluish or black vomit and hemorrhages.