What happens if I miss a dose?
Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
Overdose symptoms may include severe dizziness, pounding heartbeats, nausea, vomiting, and feeling like you might pass out.
What should I avoid while taking nifedipine?
Grapefruit and grapefruit juice may interact with nifedipine and lead to potentially dangerous effects. Discuss the use of grapefruit products with your doctor. Do not increase or decrease the amount of grapefruit products in your diet without first talking to your doctor.
Avoid getting up too fast from a sitting or lying position, or you may feel dizzy. Get up slowly and steady yourself to prevent a fall.
Drinking alcohol can lower your blood pressure further and may increase certain side effects of nifedipine.
What other drugs will affect nifedipine?
Tell your doctor about all other medicines you use, especially:
- acarbose (Precose);
- cimetidine (Tagamet);
- fentanyl (Actiq, Duragesic, Fentora) or other narcotic pain medications;
- digoxin (Lanoxin);
- St. John's wort;
- rifabutin (Mycobutin), rifampin (Rifadin, Rifater, Rifamate) or rifapentine (Priftin);
- a blood thinner such as warfarin (Coumadin);
- an antibiotic such as clarithromycin (Biaxin), dalfopristin/quinupristin (Synercid), or erythromycin (E.E.S., EryPed, Ery-Tab, Erythrocin);
- antifungal medication such as fluconazole (Diflucan), itraconazole (Sporanox), or ketoconazole (Nizoral);
- a beta-blocker such as atenolol (Tenormin, Tenoretic), carvedilol (Coreg), labetalol (Normodyne, Trandate), metoprolol (Lopressor, Toprol), nadolol (Corgard), propranolol (Inderal, InnoPran), sotalol (Betapace), timolol (Blocadren), and others;
- a heart rhythm medication such as quinidine (Quin-G) or flecaininde (Tambocor);
- HIV/AIDS medicine such as atazanavir (Reyataz), delavirdine (Rescriptor), fosamprenavir (Lexiva), indinavir (Crixivan), nelfinavir (Viracept), ritonavir (Norvir, Kaletra, or saquinavir (Invirase);
- medicines used to prevent organ transplant rejection, such as sirolimus (Rapamune) or tacrolimus (Prograf);
- other heart or blood pressure medications such as benazepril (Lotensin), diltiazem (Cartia, Cardizem), doxazosin (Cardura), or verapamil (Calan, Covera, Isoptin, Verelan); or
- seizure medication such as carbamazepine (Carbatrol, Tegretol), phenobarbital (Solfoton), or phenytoin (Dilantin).
This list is not complete and other drugs may interact with nifedipine. Tell your doctor about all medications you use. This includes prescription, over-the-counter, vitamin, and herbal products. Do not start a new medication without telling your doctor.
Where can I get more information?
Your pharmacist can provide more information about nifedipine.
Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.
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