Nifedipine Systematic (IUPAC) name 3,5-dimethyl 2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate Clinical data Trade names Procardia AHFS/Drugs.com MedlinePlus Pregnancy cat. C: (USA) Legal status ? Routes Oral Pharmacokinetic data Bioavailability 45-56% Protein binding 92-98% Metabolism Gastrointestinal, Hepatic Half-life 2 hours Excretion Renal: >50%, Biliary: 5-15% Identifiers CAS number ATC code C08 PubChem DrugBank ChemSpider UNII KEGG ChEBI ChEMBL Chemical data Formula C17H18N2O6 Mol. mass 346.335 g/mol SMILES & Physical data Melt. point 173 °C (343 °F) (what is this?)
Nifedipine (brand names Adalat, Nifediac, Cordipin, Nifedical, and Procardia) is a dihydropyridine calcium channel blocker. Its main uses are as an antianginal (especially in Prinzmetal's angina) and antihypertensive, although a large number of other indications have recently been found for this agent, such as Raynaud's phenomenon, premature labor, and painful spasms of the esophagus in cancer and tetanus patients. It is also commonly used for the small subset of pulmonary hypertension patients whose symptoms respond to calcium channel blockers.
The recommended starting dose for immediate-release nifedipine capsules is 10 mg, taken 3 times daily. With the extended-release version, the recommended starting nifedipine dosage is 30 to 60 mg, taken once daily. Nifedipine rapidly lowers blood pressure, and patients are commonly warned they may feel dizzy or faint after taking the first few doses. Tachycardia (fast heart rate) may occur as a reaction. These problems are much less frequent in the sustained-release preparations of nifedipine (such as Adalat OROS). A more novel release system is GITS (Gastro-Intestinal Therapeutic System), which - according to Bayer - provides 24-hour continuous release through an osmotic push system. Recent trials with GITS include INSIGHT (for blood pressure) and ACTION (for angina).
Extended release formulations of nifedipine should be taken on an empty stomach, and patients are warned not to consume anything containing grapefruit or grapefruit juice, as they raise blood nifedipine levels. There are several possible mechanisms, including the lowering of CYP3A4 activity.
The approved uses for nifedipine are the long-term treatment of hypertension (high blood pressure) and angina pectoris. In hypertension, recent clinical guidelines generally favour diuretics and ACE inhibitors, although calcium channel antagonists, along with thiazide diuretics, are still favoured as primary treatment for over 55's and black patients.
Sublingual nifedipine has previously been used in hypertensive emergencies. This was found to be dangerous, and has been abandoned. Sublingual nifedipine causes blood-pressure lowering through peripheral vasodilation. It can cause an uncontrollable decrease in blood pressure, reflex tachycardia, and a steal phenomenon in certain vascular beds. There have been multiple reports in the medical literature of serious adverse effects with sublingual nifedipine, including cerebral ischemia/infarction, myocardial infarction, complete heart block, and death. As a result of this, the FDA reviewed all data regarding the safety and efficacy of sublingual nifedipine for hypertensive emergencies in 1995, and concluded that the practice should be abandoned because it was neither safe nor efficacious.  An exception to the avoidance of this practice is in the use of nifedipine in the treatment of hypertension associated with autonomic dysreflexia in spinal cord injury.
Nifedipine has been used frequently as a tocolytic (agent that delays premature labor). A Cochrane review has concluded that it is comparable with magnesium sulfate and beta-agonists (such as ritodrine) with fewer side-effects. Its role vis à vis atosiban is not established.
Raynaud's phenomenon is often treated with nifedipine. A 2005 meta-analysis showed modest benefits (33% decrease in attack severity, 2.8-5 reduction in absolute number of attacks per week); it does conclude that most included studies used low doses of nifedipine.
Oral nifedipine has also been found to cause iron loss in the urine of small animals. A NIH NIDDK study is currently seeing if the drug can increase the removal of iron into the urine in humans as well, thus becoming a possible treatment for iron overload.
A number of persons have developed toxicity due to acute overdosage with nifedipine, either accidentally or intentionally, and via either oral or parenteral administration. The adverse effects include lethargy, bradycardia, marked hypotension and loss of consciousness. The drug may be quantitated in blood or plasma to confirm a diagnosis of poisoning in hospitalized patients or to assist in a medicolegal death investigation. Analytical methods usually involve gas or liquid chromatography and specimen concentrations are usually in the 100-1000 μg/L range.
The use of nifedipine and related calcium channel antagonists was much reduced in response to 1995 trials that mortality was increased in patients with coronary artery disease who took nifedipine. This study was a meta-analysis, and demonstrated harm mainly in short-acting forms of nifedipine (that could cause large fluctations in blood pressure) and at high doses of 80 mg a day and more.
- ^ Brown MJ, Palmer CR, Castaigne A, et al. (2000). "Morbidity and mortality in patients randomised to double-blind treatment with a long-acting calcium-channel blocker or diuretic in the International Nifedipine GITS study: Intervention as a Goal in Hypertension Treatment (INSIGHT)". Lancet 356 (9227): 366–72. doi:10.1016/S0140-6736(00)02527-7. PMID 10972368.
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- ^ Hypertension: management of hypertension in adults in primary care. Clinical guideline CG34. National Institute for Health and Clinical Excellence (NICE), June 2006. Fulltext index. ISBN 1-86016-285-1.
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- ^ Campagnolo, DI. "Autonomic Dysreflexia in Spinal Cord Injury". eMedicine. http://emedicine.medscape.com/article/322809-medication. Retrieved 7/14/11.
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- ^ http://clinicaltrials.gov/ct2/show/NCT00712738?term=iron+overload&rank=1
- ^ Nifediac package insert, TEVA Pharmaceuticals, Sellersville, Pennsylvania, August, 2009.
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Tocolytics/labor repressants (G02CA) β2-agonists Oxytocin antagonist NSAID Calcium channel blockerNifedipine Myosin inhibitor
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Nifedipine — Nifédipine Nifédipine structure chimique de la nifédipine Général Nom IUPAC diméthyl ester de l acide 1,4 dihydro 2,6 diméthyl 4 (2 nitrophényl) 3,5 pyridinedicarboxylique … Wikipédia en Français
Nifédipine — structure chimique de la nifédipine Général Nom IUPAC diméthyl ester de l acide 1,4 dihydro 2,6 diméthyl 4 (2 nitrophényl) 3,5 pyridinedicarboxylique … Wikipédia en Français
nifedipine — [ni fed′ə pēn΄] n. a yellow, crystalline powder, C17H18N2O6, that dilates blood vessels, used to treat angina pectoris, hypertension, etc. * * * … Universalium
nifedipine — [ni fed′ə pēn΄] n. a yellow, crystalline powder, C17H18N2O6, that dilates blood vessels, used to treat angina pectoris, hypertension, etc … English World dictionary
nifedipine — noun Etymology: probably nitr + fe (from phenyl) + dipine (by alteration & shortening from pyridine) Date: 1974 a calcium channel blocker C17H18N2O6 that is a coronary vasodilator used especially in the treatment of angina pectoris … New Collegiate Dictionary
Nifedipine — НИФЕДИПИН ( Nifedipinе )*. 2,6 Диметил 4 (2 нитрофенил) 1,4 дигидропиридин З,5 дикарбоновой кислоты диметиловый эфир. Синонимы: Адалат, Кордафен, Кордипин, Коринфар, Нифангин, Нифекард, Аdаlat, Аdarat, Саlcigard, Соrdafen, Соrdipin, Соrinfar,… … Словарь медицинских препаратов
nifedipine — (= BAYa1041; Nifedin; Procardia) A calcium channel blocker (346 D) used experimentally and as a coronary vasodilator … Dictionary of molecular biology
nifedipine — noun A dihydropyridine calcium channel blocker, used mainly as an antianginal and antihypertensive … Wiktionary
nifedipine — A calcium channel blocking agent of the dihydropyridine type; coronary vasodilator. * * * ni·fed·i·pine nī fed ə .pēn n a calcium channel blocker C17H18N2O6 that is a coronary vasodilator used esp. in the treatment of angina pectoris see ADALAT … Medical dictionary
Nifedipine — n. (in Medicine) substance that blocks the benefits of calcium and is used as a drug to widen blood vessels (when treating heart disease or a lack of blood supply to the heart) … English contemporary dictionary