Which precaution is most important for the nurse to teach a patient who is prescribed isoniazid (INH, Nydrazid)?

Question

a. "Use another form of birth control in addition to oral contraceptives to prevent an unplanned pregnancy."
b. "Do not drive or operate dangerous equipment until you know how this drug af-fects you."
c. "Wear glasses rather than contact lenses throughout this drug therapy."
d. "Avoid coffee and any foods or beverages that contain caffeine."

Answer 1

D
Isoniazid raises blood pressure. When this drug is taken in combination with other drugs or agents that also raise blood pressure, the patient can develop dangerous hypertension. Caffeine is a common food ingredient that greatly increases the risk for hypertension when taken in combi-nation with isoniazid.