A nurse is reinforcing teaching with a client who has schizophrenia and a new prescription for haloperidol. The nurse should instruct the client to avoid taking which of the following medications?

A. Atropine. Atropine is an anticholinergic medication used to treat bradycardia and reduce secretions before surgery. It has no effect on reversing anticoagulation caused by heparin and would not be an appropriate treatment for heparin overdose.

B. Vitamin K. Vitamin K is used as an antidote for warfarin toxicity, as it helps produce clotting factors that warfarin inhibits. However, it does not reverse the effects of heparin, which works by enhancing the activity of antithrombin to prevent clot formation.

C. Vitamin B12. Vitamin B12 is essential for red blood cell production and neurological function, primarily used to treat conditions like pernicious anemia. It does not have any role in reversing the anticoagulant effects of heparin and would not be beneficial in this situation.

D. Protamine. Protamine sulfate is the specific antidote for heparin overdose. It binds to heparin, neutralizing its anticoagulant effects and preventing excessive bleeding. Protamine is administered intravenously in cases of heparin toxicity or when urgent reversal is needed, such as before surgery or in cases of uncontrolled bleeding.

A. Insert the needle at a 45° or 90° angle. Enoxaparin is administered subcutaneously, and subcutaneous injections should be given at either a 45° or 90° angle, depending on the client’s body size and the amount of subcutaneous tissue available. A 90° angle is typically used for clients with more subcutaneous tissue, while a 45° angle is appropriate for those with less.

B. Hold the skin taut during administration. When giving subcutaneous injections, the skin should be gently pinched rather than held taut. Pinching helps ensure the medication is delivered into the fatty tissue rather than the muscle, reducing the risk of intramuscular injection, which can increase bleeding risk with anticoagulants like enoxaparin.

C. Massage the injection site after administering the enoxaparin. Massaging the injection site is contraindicated because it can cause tissue irritation, bruising, and increased risk of bleeding. Instead, gentle pressure may be applied with a gauze pad if necessary to minimize bleeding.

D. Use a 4 cm (1.6 in) needle. A needle length of 4 cm (1.6 inches) is too long for a subcutaneous injection and increases the risk of intramuscular administration, which could lead to increased bleeding and bruising. The recommended needle length for subcutaneous injections is typically ½ inch (1.25 cm) to ⅝ inch (1.6 cm) to ensure proper medication delivery.