Hi, thanks for using Healthcare Magic, I understand your concern, but unfortunately, you doesn t tell us about why are you taking this drugs, and how long have you took this drugs. Diltiazem is often used to help prevent attacks of angina, especially when used in combination with a drug to help prevent clots, like aspirin or clopidogrel. It is also commonly used to treat hypertension and help to lower the blood pressure in the body. On administration with oral Diltiazem is absorbed approximately 80-90% and binds to plasma proteins. The effect begins to appear less than 30 minutes after administration and plasma peak concentration is reached after 2 hours with a half-life of 4 hours. This compound is excreted in the form of metabolite through urine (35%) and feces (60%). It is meant to be taken in a long term, I just want to tell you that, if you stop taking it suddenly, the smooth muscle in your body will suddenly be able to contract again and may cause rebound hypertension. This condition can be worse than before you began treatment. So, you should gradually reduce the dose over time to allow your body time to readjust. Hope this helps. Take care.