A woman is traveling to a country where she will be at high risk for malarial infection. What will the nurse teach her regarding prophylactic therapy with hydroxychloroquine?

The drug is usually started 1 to 2 weeks before traveling to endemic areas and is continued for 4 weeks after leaving the area.

The drug is started 3 weeks before exposure but can be discontinued once she leaves the area.

Hydroxychloroquine is better absorbed and has fewer adverse effects if taken on an empty stomach.

The medication is taken only when she observes mosquito bites because it can have toxic effects if taken unnecessarily.