PRECAUTIONS: Before taking verapamil, tell your doctor or pharmacist if you are allergic to or to other calcium channel blockers. The outer shell of Covera-HS does not do not worry if you see it in your stool. How to thank TFD for its existence? Tell friend about us, add link to this page, add the site to iGoogle, or visit webmaster page for free fun content. In these same studies, after repetitive dosing, the half-life increased to range from. Verapamil may reduce total body clearance and extrarenal clearance of digitoxin by 27 and 29 respectively. If you are sensitive to or have ever had an allergic de unde pot cumpara isoptin nu prescriptie reaction to Calan or any other brands of verapamil, or other calcium channel blockers, do not take Isoptin.