A client comes to the family planning clinic for follow-up and is currently taking an oral contraceptive. During the interview assessment, the client states she has been using some "natural medicines."
Which herbal preparation should alert the nurse to a possible interaction with oral contraceptives?
1. Valerian
2. Echinacea
3. Garlic
4. Milk thistle
Correct Answer: 4
Rationale 1: Valerian may increase the sedative effects of antianxiety medication.
Rationale 2: Echinacea may reduce the effectiveness of immunosuppressants.
Rationale 3: Garlic may cause a need for an increased dose of antihypertensives.
Rationale 4: Milk thistle reduces the effectiveness of oral contraceptives.
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