Final answer:
Epinephrine has been removed from the cardiac arrest algorithm due to updated guidelines in 2020.
Step-by-step explanation:
The drug that has been removed from the cardiac arrest algorithm is epinephrine. Epinephrine was previously recommended as a standard medication for cardiac arrest, but recent research has shown that it may not improve survival rates and can have adverse effects on patients.
As a result, the American Heart Association updated their guidelines in 2020 to remove the routine use of epinephrine in cardiac arrest treatment.