A nurse is obtaining a medical history from a client who is to start warfarin therapy and currently uses herbal supplements at home. The nurse should inform the client that which of the following herbal supplements can interact adversely with warfarin?

Choice A reason: Injecting the medication into the abdomen above the level of the iliac crest is the correct action. This is the preferred site for heparin administration, as it has fewer blood vessels and nerves, and allows for better absorption of the medication. The nurse should avoid the area around the umbilicus, as it may have increased bleeding and bruising.

Choice B reason: Massaging the injection site after administration of the medication is not the correct action. This may cause hematoma formation, tissue irritation, and reduced effectiveness of the medication. The nurse should apply gentle pressure to the injection site for 1 to 2 minutes after administration.

Choice C reason: Using a 1-inch needle to inject the medication is not the correct action. This may cause pain, tissue damage, and bleeding. The nurse should use a 25- to 28-gauge needle that is 3/8 to 5/8 inch long to inject the medication.

Choice D reason: Using a 22-gauge needle to inject the medication is not the correct action. This may cause pain, tissue damage, and bleeding. The nurse should use a 25- to 28-gauge needle that is 3/8 to 5/8 inch long to inject the medication.

Choice A reason: Using an electric razor while on warfarin is the correct instruction. Warfarin is an anticoagulant that inhibits the formation of blood clots and prolongs the bleeding time. Using an electric razor can reduce the risk of cuts and bleeding while shaving. The client should avoid using sharp objects or instruments that can cause injury or trauma.

Choice B reason: Doubling the dose of warfarin if a dose is missed is not the correct instruction. This is a dangerous and potentially fatal advice, as it can cause overdose and severe bleeding. The client should take the missed dose as soon as possible, unless it is close to the next scheduled dose, in which case the client should skip the missed dose and resume the regular dosing schedule. The client should never take extra doses or change the dose without consulting the provider.

Choice C reason: Mild nosebleeds being common during initial treatment is not the correct instruction. This is a false and misleading statement, as nosebleeds are not a normal or expected side effect of warfarin therapy. Nosebleeds can indicate bleeding problems or complications, such as thrombocytopenia, which is a low platelet count. The client should report any nosebleeds or other signs of bleeding, such as bruising, petechiae, hematuria, or melena, to the provider immediately.

Choice D reason: Increasing fiber intake to reduce the adverse effect of constipation is not the correct instruction. This is an irrelevant and unnecessary recommendation, as constipation is not a common or serious adverse effect of warfarin therapy. Constipation can be caused by many factors, such as diet, hydration, activity, or medication. The client should maintain a balanced and consistent diet, drink plenty of fluids, and exercise regularly to prevent constipation. The client should also avoid foods that are high in vitamin K, such as green leafy vegetables, as they can interfere with the effect of warfarin.