What action should be taken for prevention of bee stings?

Many people with severe Allergies, especially bee stings, carry a device called an Epi-Pen. An Epi-Pen is a dosage of a powerful drug, epinephrine, which counteracts an anaphylactic reaction. To use it, remove the safety cap and simply press the needle end firmly against the victim's thigh, about midway between the knee and hip. The spring-loaded needle will automatically extend, delivering the epinephrine into the muscle where it will be rapidly transferred into the bloodstream.

I looked up this question here for a boy scouts requirement.