The drug is prescribed to treat the following heart-related conditions:

  •       Angina (ischemic chest pain)
  •       Hypertension (high blood pressure)
  •       Arrhythmia (irregular heart rhythm)

IUPAC name: [(2S,3S)-5-[2-(dimethylamino)ethyl]-2-(4-methoxyphenyl)-4-oxo-2,3-dihydro-1,5-benzothiazepin-3-yl] acetate

Drug class: Calcium-channel blockers

Route of administration: Oral, intravenous

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Is it a drug that needs a prescription? YES

Is it an OTC drug? NO

Mechanism of action 

Diltiazem works by inhibiting the calcium channels in the heart muscles and blood vessels, which helps in the relaxation and dilation of the blood vessels and increases the amount of blood and oxygen that can reach the heart. It lowers blood pressure and lessens the possibility of angina.

Side effects

It could result in lightheadedness, nausea, weakness, flushing, constipation, headaches, dizziness, and fast heart rate.


Before using this medication, take the following precautions and notify your doctor:

If you are allergic to it or to other calcium channel blockers, or if you have other allergies,

If you are taking any other medication (prescribed, non-prescribed, or herbal products), especially beta-blockers (such as atenolol, propranolol, or metoprolol),

If you have or ever had cardiac disease (such as congestive heart failure, sick sinus syndrome, myocardial infarction), muscle disorders (such as myasthenia gravis, muscular dystrophy), kidney disease, hepatic issues, hypotension (low blood pressure),

If you have undergone any type of surgery,

While taking this medication, limit your alcohol usage since it increases your chances of developing blurred vision, dizziness, or drowsiness. It may also cause a loss of alertness.

The adverse effects of this medicine may affect older people more severely.

Consult your doctor if you are pregnant or breastfeeding.

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