Final answer:
The drug used for anaphylactic shock is epinephrine, with a usual adult dose of 0.3 to 0.5 mg intramuscularly. However, for patients with cardiovascular disease, the dose may need to be adjusted and given under medical supervision.
Step-by-step explanation:
The drug used to counteract the effects of anaphylactic shock is epinephrine. The maximum dose of epinephrine for a patient with cardiovascular disease is usually more conservative to avoid potential cardiac complications. While the standard epinephrine dose for an adult experiencing anaphylaxis is typically around 0.3 mg to 0.5 mg when administered intramuscularly, this dose may be adjusted based on the patient's specific health parameters and risk factors. Therefore, it's critical that the administration of epinephrine to such patients is done under the guidance of healthcare professionals who can assess the appropriate dose for individual circumstances.