Diltiazem is used to treat irregular heartbeats and high blood pressure.

You need to add a PET to your profile before...
Add One Now

You need to add a VET to your profile before...
Add One Now


Diltiazem Basics

Diltiazem is an extra-label calcium channel blocker given to dogs and cats suffering from various heart conditions, including hypertrophic cardiomyopathy (thickened heart walls), high blood pressure, and irregular heartbeats. Calcium enters the heart through calcium channels and causes the heart muscle and blood vessels to contract, making it harder to pump blood through the body. Diltiazem blocks these calcium channels, reducing the contraction of the heart muscle and dilating the arteries. This slows the heart beat and lowers blood pressure, allowing the heart to pump blood more efficiently.

Diltiazem requires a prescription from your veterinarian. It is available in 30 mg tablets, 180 mg extended release capsule, and 240 mg extended release capsules. Extended Release (ER) capsules come in two different capsule types. Ask your veterinarian which type of extended release capsule will work best for you and your pet. Dilacor XR Capsules can be opened and contain a tablet, which may make giving diltiazem to your pet easier, especially if your pet has trouble taking pills. Cardizem CD Capsules should not be opened, but can work well for pets who take pills easily.

Diltiazem Directions

Give as directed by your veterinarian and follow all instructions printed on the prescription label. Complete the entire prescription unless instructed otherwise by your veterinarian. Dosage and duration of treatment depend on the condition being treated and response to the medication. Give this medication with or without food. In the case of a missed dose of diltiazem, give it as soon as you remember or wait until it is time to give the next dose. Do NOT give a double dose of Diltiazem.

Store at room temperature, protected from light and moisture.

Diltiazem Warnings

Keep out of the reach of children and pets. Do not use in humans. Do not use in pets with a known hypersensitivity to diltiazem. Some animals may become weak due to lower blood pressure while taking diltiazem. Notify your veterinarian if your animal is taking any other medications, especially digoxin, propanolol, cimetidine, and cyclosporine. Use caution when giving diltiazem to animals suffering from heart failure or low blood pressure. If you notice any behavioral or physiological side effects when administering this medication, contact your veterinarian immediately.

Allergic Reactions and Serious Side Effects

Adverse reactions and serious side effects are rare, however, they can occur. In the case of an adverse reaction or serious side effect, seek immediate veterinary attention. Some common signs of allergic reactions and serious side effects are breathing difficulties, facial swelling, hives, scratching, pale gums, shock, or seizures. Furthermore, the following symptoms could be signs of an overdose: low heart rate, pale gums, rapid breathing, loss of appetite, or weakness.

If you have any additional questions regarding this product, please contact us at (877)220-6337. A member of our pharmacy staff will be happy to assist you!

Additional information


Capsule, Tablet

Prescription Strength

30mg, 180mg ER (Cardizem CD Generic), 180mg ER (DILACOR XR Generic), 240mg ER (Cardizem CD Generic), 240mg ER (DILACOR XR Generic)