# A client newly prescribed modafinil for narcolepsy asks the nurse what additional precaution is important if she also takes a combined oral contraceptive. Which is the nurse's best response?

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=391766&lang=en  
> language: en  
> subject: Medical Emergencies  
> category: PA

## Question

A client newly prescribed modafinil for narcolepsy asks the nurse what additional precaution is important if she also takes a combined oral contraceptive. Which is the nurse's best response?

## Option

1. To maintain contraceptive protection, you should take an additional hormonal pill daily while on modafinil and continue for one month after stopping.
2. Modafinil induces CYP3A4 and reduces contraceptive effectiveness; an additional or alternative non-hormonal method is recommended during and 1 month after therapy **✔ Correct answer**
3. There is no clinically significant interaction between modafinil and oral contraceptives, so you may continue your current regimen without any changes.
4. Taking the oral contraceptive and modafinil at separate times of the day, with at least four hours between them, will prevent the interaction.

**Correct answer: 2**

## Explanation

Correct (2): Modafinil induces CYP3A4 and reduces blood levels of estrogen-containing contraceptives; pregnancy can result. An additional or alternative non-hormonal method is recommended during and for 1 month after stopping. (1) Wrong. (3) Modafinil has no contraceptive effect. (4) Timing does not solve the metabolism issue.

## In-depth explanation

Memory Tip CYP3A4 inducers that reduce hormonal contraception: rifampin, modafinil, carbamazepine, phenytoin, topiramate >200 mg, St. John's wort. CPG Counsel about backup or non-hormonal methods at initiation.

## Clinical scenario

Scenario 28-year-old female with narcolepsy starting modafinil 200 mg PO every morning. Currently on combined oral contraceptive. Asks about interactions.

## Key concepts

- **CYP3A4 induction** — Increased enzyme activity accelerating metabolism of co-administered drugs; affects hormonal contraceptives.
- **Contraceptive failure risk** — Reduced effectiveness when enzyme inducers shorten estrogen half-life.
- **Modafinil** — Wakefulness-promoting agent for narcolepsy, shift-work disorder, OSA-related sleepiness.

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