Multiple drug administration increase chances of drug interaction, altering the responses of drugs. Generally multiple drug administration should be avoided for safe and cost-effective patient care. However in major parts of the world there is augmented load of cardiovascular disease, epilepsy and chronic non-communicable disorders such as diabetes mellitus. Hence it is essential to recognize the probable toxicities that might take place as a result of the drug-drug interaction upon simultaneous use of anti-hypertensive, anti-arrhythmic, anti-epileptic, and anti-diabetic drugs. This monograph...