Final answer:
Epinephrine, also known as adrenaline, is the drug used to counteract the effects of anaphylactic shock. The maximum recommended dose for a healthy patient is typically 0.3 mg.
Step-by-step explanation:
The drug used to counteract the effects of anaphylactic shock is epinephrine, also known as adrenaline. It is administered through an injection, typically into the thigh muscle. It works by constricting blood vessels, relaxing smooth muscles in the airways, and reducing the release of chemicals that cause allergic reactions.
The maximum dose of epinephrine for a healthy patient may vary depending on the situation and the individual, but commonly accepted guidelines suggest a maximum dose of 0.3 mg. Higher doses may be required in certain circumstances, such as severe anaphylaxis or when administered by healthcare professionals.