Calan SR (Verapamil) is a prescribed medication of the class known as calcium channel blockers. It is used for control of high blood pressure. The usual starting dose in the sustained release (SR) formulation is 180mg once daily in the AM. The starting dose for the regular formulation is 80mg three times daily. Lower starting dosages are recommended in the elderly. It is not generally considered safe during pregnancy, although it is generally considered safe during nursing. It should not be used in the settings of severe left ventricular dysfunction or left ventricular dysfunction treated with beta blocker drugs, moderate to severe heart failure, hypotension, cardiogenic shock, sick sinus syndrome, 2d or 3d degree atrioventricular block (unless paced), or atrial flutter or fibrillation with an accessory bypass tract. It is potentiated by CYP3A4 inducers (certain, antifungals, antivirals, macrolides. Monitor liver function tests.
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