Tiazac (Diltiazem Hydrochloride)
Tiazac (diltiazem ER) Dosage and Side Effects
TIAZAC is used to treat high blood pressure and control chest pain (known as angina). It's also sometimes used to treat abnormal heart rhythms (arrhythmia).
Proper Use of this medication
The typical oral dose for adults with chest pain or high blood pressure ranges from 120 milligrams (mg) to 540 mg a day.
The immediate release tablets are typically given up to four times a day.
The extended-release formula is given once a day and should not be crushed or chewed.
If you suspect an overdose, contact a poison control center or emergency room immediately.
Missed Dose of TIAZAC
If you miss a dose of TIAZAC, take it as soon as you remember.
However, if it is almost time for your next dose, skip the missed dose and continue on your regular schedule.
Do not "double up" to make up for a missed one.
Common Side Effects
TIAZAC can cause side effects. You should tell your doctor if the following symptoms are severe or do not go away:
- Dizziness or lightheadedness
- Slow heartbeat
- Nasal congestion
Serious Side Effects
TIAZAC can cause serious side effects. You should call your doctor immediately if you experience:
- Swelling of the face, lips, tongue, eyes, hands, arms, feet, lower legs, or ankles
- Breathing or swallowing difficulties
- Yellowing of the skin or eyes (jaundice)
- Unusual bleeding or bruising
- Extreme fatigue
- Lack of energy
- Loss of appetite
- Pain in the upper right part of the stomach
- Increase in frequency or severity of chest pain
- Flu-like symptoms
Warnings and Precautions
TIAZAC may prevent chest pain if taken regularly, but it does not stop chest pain once it starts.
TIAZAC controls high blood pressure and chest pain, but it does not cure them.
It may take up to two weeks for you to experience the full benefit of this medicine.
Your doctor will likely start you on a low dose of TIAZAC and then gradually increase your dose.
Your blood pressure and pulse will be checked regularly while taking TIAZAC to determine your response to the drug.
Before taking TIAZAC, you should tell your doctor if you have ever had:
- A heart attack
- Any condition that causes food to move more slowly through your digestive system
- Low blood pressure
- Heart, liver, or kidney disease
You should also tell your doctor if you plan to have any type of surgery, including dental surgery.
Pregnancy and TIAZAC
There are not adequate studies to show that this drug is safe in pregnant women.
TIAZAC is excreted in breast milk, so women should not take it while breastfeeding.
Interactions with this medication
Many medications can interact with TIAZAC.
Tell your doctor about all prescription, non-prescription, illegal, recreational, herbal, nutritional, or dietary drugs you are taking, especially:
- Atazanavir (Reyataz)
- Beta blockers such as atenolol (Tenormin), labetalol (Trandate), metoprolol (Lopressor, Toprol XL), nadolol (Corgard), and propranolol (Inderal)
- Buspirone (BuSpar)
- Benzodiazepines such as midazolam (Versed) and triazolam (Halcion)
- Carbamazepine (Carbatrol, Epitol, Tegretol)
- Cimetidine (Tagamet)
- Digoxin (Lanoxin, Lanoxicaps)
- Cyclosporine (Gengraf, Neoral, Sandimmune)
- Rifampin (Rifadin, Rifamate, Rifater, Rimactane)
- Lovastatin (Altoprev, Mevacor, Advicor)
- Quinidine (Quinidex)
Other TIAZAC Interactions
Grapefruit and grapefruit juice may interact with TIAZAC. Your doctor may advise you to follow a low-sodium diet while taking TIAZAC.
This medication may impair your thinking and reaction time. Be especially careful when driving or performing any activity that may require you to be alert.
You should also try to avoid exposure to sunlight or tanning beds. TIAZAC can increase your skin's sensitivity to light and you may develop sunburns more easily.
Other related products
The above information is an educational aid only. It is not intended as medical advice for individual conditions or treatments. Talk to your doctor, nurse or pharmacist before following any medical regimen to see if it is safe and effective for you.