 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  Enter your medication into the WebMD interaction checker Check InteractionThe overdose of Diltiazem Oral: If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center.  Notes Do not share this medication with others. Talk with your doctor about making changes to your lifestyle that may help this medication work better (such as stress reduction programs, exercise, and dietary changes). Lab and/or medical tests (such as kidney/liver function, pulse, blood pressure, EKG) may be done while you are taking this medication. Keep all medical and lab appointments. Consult your doctor for more details. There are different brands and types of this medication available. Many do not have the same effects. Do not change brands or types without consulting your doctor or pharmacist. Have your blood pressure and pulse checked regularly while taking this medication. Learn how to check your own blood pressure and pulse at home, and share the results with your doctor.  Missed Dose If you miss a dose, take it as soon as you remember. </s>