What is the term used for a well understood drug model with which other drugs in its representative class are compared?

Choice A reason: The initial phase of drug distribution is not the correct definition of the term 'first pass effect'. Drug distribution is the process by which a drug moves from the bloodstream to the tissues and organs of the body. The initial phase of drug distribution is influenced by factors such as blood flow, tissue permeability, plasma protein binding, and tissue binding. The first pass effect is not related to drug distribution, but to drug metabolism, which is the chemical transformation of a drug in the body.

Choice B reason: The rapid absorption of a drug in the intestine is not the correct definition of the term 'first pass effect'. Drug absorption is the process by which a drug enters the bloodstream from the site of administration. The rapid absorption of a drug in the intestine depends on factors such as the drug formulation, the pH of the gastrointestinal tract, the presence of food or other drugs, and the surface area and motility of the intestine. The first pass effect is not related to drug absorption, but to drug metabolism, which is the chemical transformation of a drug in the body.

Choice C reason: The initial rapid excretion of a drug through the urinary system is not the correct definition of the term 'first pass effect'. Drug excretion is the process by which a drug or its metabolites are eliminated from the body. The initial rapid excretion of a drug through the urinary system is influenced by factors such as the renal blood flow, the glomerular filtration rate, the tubular secretion and reabsorption, and the urine pH. The first pass effect is not related to drug excretion, but to drug metabolism, which is the chemical transformation of a drug in the body.

Choice D reason: The metabolism of a drug before it reaches the systemic circulation is the correct definition of the term 'first pass effect'. Drug metabolism is the process by which a drug is chemically transformed in the body, usually by enzymes in the liver or other tissues. The first pass effect is a phenomenon of drug metabolism that occurs when a drug is administered orally and passes through the gastrointestinal tract and the liver before reaching the systemic circulation. The first pass effect can reduce the bioavailability and the effectiveness of the drug, as some or most of the drug may be metabolized and inactivated before reaching the site of action.

Choice A reason: Monitor the patient for addiction is not a necessary measure for the nurse to take when administering codeine cough syrup, which is a medication that suppresses the cough reflex by acting on the brain¹. Codeine is a Schedule V medication, which means that it has a low potential for abuse and dependence compared to other opioids. The nurse should follow the prescriber's order and the label instructions and use the lowest effective dose for the shortest duration. The nurse should also assess the patient's pain level, respiratory status, and cough frequency and severity.

Choice B reason: Advise the patient that the medication helps to thin out their secretions is an incorrect statement for the nurse to make when administering codeine cough syrup, which is a medication that suppresses the cough reflex by acting on the brain¹. Codeine does not affect the viscosity or production of the mucus in the airways, but rather reduces the urge to cough. The nurse should advise the patient to drink plenty of fluids, use a humidifier, or use saline nasal spray to help loosen and clear the secretions.

Choice C reason: Advise the patient to minimize intake of beets is not a relevant measure for the nurse to take when administering codeine cough syrup, which is a medication that suppresses the cough reflex by acting on the brain¹. Beets are a vegetable that are rich in antioxidants, fiber, and nitrates, which can lower blood pressure and improve blood flow. Beets do not interact with codeine or affect its metabolism or clearance. The nurse should encourage the patient to eat a balanced and nutritious diet, unless they have any dietary restrictions or allergies.

Choice D reason: Advise the patient that constipation is an adverse effect of the medication is the correct and appropriate measure for the nurse to take when administering codeine cough syrup, which is a medication that suppresses the cough reflex by acting on the brain¹. Codeine can also act on the opioid receptors in the gastrointestinal tract, which can reduce the peristalsis and cause constipation. The nurse should advise the patient to prevent or treat constipation by increasing their fluid and fiber intake, exercising regularly, and using laxatives or stool softeners as needed.