bisoprolol and hydrochlorothiazide, Ziac (cont.)

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Medical and Pharmacy Editor:

PRESCRIPTION: Yes

GENERIC AVAILABLE: Yes

PREPARATIONS: Tablets (bisoprolol/hydrochlorothiazide): 2.5/6.25 mg, 5/6.25 mg, and 10/6.25 mg.

STORAGE: Ziac should be stored at room temperature, 59- 86 F (15-30 C) in a tight container.

PRESCRIBED FOR: Ziac is used for treating patients with high blood pressure who have not adequately responded to either individual agent alone.

DOSING: The dose of Ziac is tailored to the patient's needs. The initial dose is 2.5/6.25 mg daily. The dose may be increased very two weeks and the maximum dose is 20/12.5 mg once daily.

DRUG INTERACTIONS: Rifampin may increase the metabolism (destruction) of bisoprolol, possibly making bisoprolol less effective. Certain calcium channel blockers (CCBs), especially verapamil (Calan, Isoptin) and diltiazem (Cardizem, Tiazac), may enhance the effect of bisoprolol on the heart. In some patients, this may cause excessive slowing of the heart rate or reduce the heart's ability to beat. The use of digoxin (Lanoxin) with bisoprolol also may cause an excessive reduction in heart rate.

Nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen (Motrin, Advil) and naproxen (Naprosyn, Anaprox, Aleve), can reduce the blood pressure lowering effects of beta blockers.

Hydrochlorothiazide reduces the elimination of lithium (Lithobid, Eskalith) by the kidneys and can lead to lithium toxicity. Nonsteroidal anti-inflammatory drugs, for example, ibuprofen, may reduce the blood pressure effects of hydrochlorothiazide.

Blood sugar levels can be elevated by HCTZ, necessitating adjustment in the doses of medications that are used for treating diabetes.

Combining HCTZ with corticosteroids may increase the risk for low levels of blood potassium and other electrolytes. Low blood potassium can increase the toxicity of digoxin (Lanoxin). Cholestyramine (Questran, Questran Light) and colestipol (Colestid) bind to hydrochlorothiazide and reduce its absorption from the gastrointestinal tract by 43%-85%.



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