Question

a nurse is caring for a client who is taking acetaminophen and codeine for pain relief. these analgesic medications interact with one another to cause an additive effect. the nurse should identify that which of the following are characteristics of additive medication interactions? (select all that apply.)

□ clients can achieve desired effects with the use of lower dosages.

□ taking the two medications together can reduce the effects of one or both medications.

□ taking the two medications together can potentiate the effects of one or both medications.

□ the two medications can produce an action neither would have produced alone.

□ both medications have similar actions.

Explanation:

1. For "Clients can achieve desired effects with the use of lower dosages": In additive interactions, combining medications with similar actions (like both being analgesics here) can allow lower doses to achieve the effect as their effects add up. So this is correct.
2. For "Taking the two medications together can reduce the effects of one or both medications": Additive interactions are about adding effects, not reducing. So this is incorrect (this would be a different type of interaction like antagonistic).
3. For "Taking the two medications together can potentiate the effects of one or both medications": Additive is a type of potentiation where the combined effect is the sum of individual effects, so this is correct.
4. For "The two medications can produce an action neither would have produced alone": This describes a synergistic or complementary interaction (like a new action), not additive. Additive is sum of existing actions. So incorrect.
5. For "Both medications have similar actions": Additive interactions occur when medications have similar actions (e.g., both analgesics), so their effects add. So this is correct.

Answer:

• Clients can achieve desired effects with the use of lower dosages.
• Taking the two medications together can potentiate the effects of one or both medications.
• Both medications have similar actions.