A client is receiving opioid therapy for pain management. The nurse is educating the client about the effects of long-term opioid use. Which statement by the nurse best explains the concept of drug tolerance?

A. Monitoring the client's blood pressure regularly: Blood pressure monitoring is important because MAOIs can precipitate hypertensive crises. However, prevention is more critical than detection after the fact. Relying solely on monitoring does not eliminate the underlying trigger for severe hypertension associated with dietary interactions.

B. Educating the client on the importance of avoiding foods high in tyramine: MAOIs inhibit monoamine oxidase, the enzyme responsible for breaking down tyramine in the gastrointestinal tract. Accumulation of tyramine leads to excessive norepinephrine release, causing severe vasoconstriction and potentially life-threatening hypertensive crisis. Avoiding aged cheeses, cured meats, fermented products, and certain alcoholic beverages is essential for safety.

C. Administering the medication with a full glass of milk: There is no pharmacologic requirement to administer MAOIs with milk. Food does not significantly alter the drug’s mechanism of action related to monoamine oxidase inhibition.

D. Assessing the client's fasting blood sugar levels before administration: MAOIs are primarily used for treatment-resistant depression and certain anxiety disorders. They do not directly alter glucose metabolism in a predictable manner that would require routine fasting glucose assessment prior to administration.

A. "This medication blocks opioid receptors so opioids cannot produce a euphoric effect.": Naltrexone is a competitive opioid antagonist that binds to mu-opioid receptors without activating them. By occupying these receptors, it prevents exogenous opioids from producing euphoric or reinforcing effects, helping to reduce the risk of relapse in individuals with opioid use disorder.

B. "This medication increases serotonin levels to improve mood and decrease drug use.": Medications that increase serotonin, such as selective serotonin reuptake inhibitors (SSRIs), target depression and anxiety, not opioid receptor activity. Naltrexone’s mechanism does not involve modulation of serotonin or other monoamine neurotransmitters.

C. "This medication replaces opioids in my body to prevent cravings.": Medications like methadone or buprenorphine act as opioid agonists or partial agonists to prevent withdrawal and cravings. Naltrexone does not replace opioids or provide agonist activity; it strictly blocks receptor activation.

D. "This medication reduces withdrawal symptoms by partially activating opioid receptors.": Partial agonists such as buprenorphine can reduce withdrawal symptoms by providing low-level receptor stimulation. Naltrexone, however, is a pure antagonist and does not activate receptors, so it does not alleviate withdrawal symptoms and should only be started after detoxification.