Cardiotonic refers to the properties or drugs that increase the strength of heart muscle contractions and improves heart function. Synonyms for cardiotonic include cardiac stimulant, inotropic agent, positive inotrope, and heart tonic. These terms are used to describe substances that stimulate the cardiac muscle to contract more forcefully, leading to an increase in cardiac output and better circulation. Some commonly used cardiotonic medications include digoxin, milrinone, and dobutamine. These medications are used to treat heart failure, irregular heartbeats, and other cardiac conditions. Overall, cardiotonic medications help to improve heart function and can have life-saving effects for those with cardiac issues.