Tildiem 60 mg Diltiazem is a calcium channel blocker medication that is used to treat: • high blood pressure, • angina, • and certain heart arrhythmias. It may also be used in hyperthyroidism if beta blockers cannot be used. It is to be taken orally and then washed down with water. Tildiem 60 mg Diltiazem works by relaxing the blood vessels so that the heart does not have to pump as hard. It also increases the supply of blood and oxygen to the heart. High blood pressure is a common condition, and when not treated it can cause damage to the brain, heart, blood vessels and the kidneys.