Tiazac (Diltiazem ER)

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Tiazac Brand
Dosage Quantity & Price
Diltiazem ER (Generic alternate to Tiazac) Generic
Dosage Quantity & Price
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Tiazac, also known as diltiazem ER, is a medication used to treat conditions such as high blood pressure (hypertension) and chronic stable angina. Diltiazem belongs to a class of drugs called calcium channel blockers.

Tiazac works by relaxing the muscles in the blood vessels, which allows for better blood flow and lowers blood pressure. It also helps to reduce the workload on the heart by slowing down the heart rate. Tiazac is available in extended-release capsules and is usually taken once per day. Tiazac must be consumed regularly to prevent angina. Do not use it to treat angina when it occurs.

Uses and Dosage

Tiazac is an Extended-Release Capsule that should be taken by mouth, with or without food, usually once daily or as per the directions given by your doctor. Swallow the capsules whole. Do not crush or chew them, as doing so can release all the drugs at once, which may increase your risk of side effects.

In case you have difficulty swallowing the capsule, you may open the capsule and carefully sprinkle its contents on a spoonful of soft, cool applesauce just before taking it. You should swallow all the drug/food mixture right away and not chew it. After taking the drug, rinse your mouth and swallow the rinse liquid to ensure that you have swallowed all the medicine. However, do not prepare a supply in advance.

The recommended dosages of Tiazac (Diltiazem ER) may vary depending on the patient's medical condition, response to treatment, and other medications they might be taking. Typically, the starting dose is 120 mg to 180 mg taken once daily, and the dosage may be gradually increased by their healthcare provider if needed. Individual patients may have different requirements, and the medication must be used regularly to obtain the most benefit from it.

Use the Tiazac capsule regularly to obtain the most benefit from it and to help you remember; use it at the same time each day. Even if you feel well, continue to take Tiazac. Most people with high blood pressure do not feel sick. For high blood pressure treatment, it may take 2 to 4 weeks before you get the full benefit of this drug.

Side Effects

Common Side Effects of Tiazac (Diltiazem ER):

  • Dizziness
  • Headache
  • Nausea
  • Rash
  • Swelling
  • Weakness

Serious Side Effects of Tiazac (Diltiazem ER):

  • Burning eyes
  • Chest pain,
  • Difficulty breathing
  • Fever
  • Fluttering in your chest
  • Hives
  • Lightheadedness
  • Pounding heartbeats
  • Rapid weight gain
  • Red or purple skin rash with blistering and peeling
  • Shortness of breath
  • Skin pain
  • Slow heartbeats
  • Sore throat
  • Stomach bloating
  • Swelling
  • Swelling of your face, lips, tongue, or throat

Form and Strength

Tiazac (Diltiazem ER) is available in the following forms and strengths:

Tiazac: Extended-Release Capsule

  • 120 mg
  • 180 mg
  • 240 mg
  • 300 mg
  • 360 mg

Diltiazem ER: Extended-Release Capsule

  • 120 mg
  • 180 mg
  • 240 mg
  • 300 mg
  • 360 mg


  • Inform your doctor if you have a history of heart failure or other heart conditions before taking Tiazac.
  • Tiazac should be used with caution in patients with liver and kidney disease.
  • Do not suddenly stop taking Diltiazem as it may cause heart-related problems.
  • Tiazac may interact with other medications, including blood thinners, heart medications, and certain antibiotics, so inform your doctor of all medications you are taking.
  • Diltiazem may cause dizziness, so avoid driving or operating heavy machinery until you know how it affects you.
  • Tiazac should be used with caution in pregnant and breastfeeding women.
  • Diltiazem can cause low blood pressure, so regular monitoring of blood pressure is necessary.
  • Tiazac can cause lightheadedness or fainting, especially when you stand up suddenly, so rise slowly to prevent falling.
  • Tiazac may cause an allergic reaction, including difficulty breathing, severe dizziness, rash, or itching. Seek medical attention right away if you experience any of these symptoms.
  • Diltiazem may interact with grapefruit and grapefruit juice, which can increase the amount of the medication in your bloodstream and increase your risk of side effects.
  • Tiazac may affect your liver function, so regular monitoring of liver enzymes may be necessary.
  • Diltiazem may cause constipation, which can be managed with dietary changes, fluid intake, and exercise.

Frequently Asked Questions (FAQ)

Can Tiazac be used during pregnancy or while breastfeeding?

Tiazac should only be used during pregnancy or while breastfeeding if the potential benefits to the mother outweigh the potential risks to the fetus or nursing infant. discuss this with your doctor before taking Tiazac.

What should I do if I miss a dose of Tiazac?

If you miss a dose of Tiazac, take it as soon as you remember. If it is almost time for your next dose, skip the missed dose and continue your regular dosing schedule.

Can Tiazac cause weight gain?

Weight gain is not a common side effect of Tiazac. However, some people may experience fluid retention which can cause weight gain. Contact your doctor if you notice any significant changes in weight.

How long does it take for Tiazac to start working?

Tiazac may take several weeks to start working fully. You may not notice any significant changes in blood pressure or symptoms right away. It is important to take Tiazac regularly and as prescribed by your doctor.


It's important to purchase Tiazac from verified Canadian pharmacy.

Additional information

Generic name:

Diltiazem ER, Diltiazem Er


24H ER Capsule


120mg, 180mg, 240mg, 300mg, 360mg

Quantities Available: