The patient medication order reads “Cyanocobalamin 500 mcg IM now.” You find a vial of cyanocobalamin that is 1,000 mcg/mL and give the patient a 1 mL injection in the deltoid muscle of her left arm. When you get ready to chart the medication, you realize you should have given only 0.5 mL of the medication. What should you do now?

As you sit in the library with your friend studying for your weekly quiz on the integumentary system, you come upon an article about the hazards of prolonged exposure to the sun's rays. your curious nature leads you to research the subject further. you're fascinated to learn that minimal exposure to the sun allows you skin to manufacture vitamin d, which is important to maintain homeostasis. you also read that although sunscreen can protect you from the ultraviolet (uv) rays of the sun, some medications can actually increase a person's sensitivity to the sunlight.