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 PRILOSEC OTC 42 TABLETS NEW IN BOX EXP 5-14 FREE SHIPPING US $15.51 
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 PRILOSEC OTC 84 TABLETS 6 BOXES OF 14 TABLETS EACH US $31.95
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 PRILOSEC OTC 42 TABLETS NEW IN BOX EXP 08-14 US $11.50
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 PRILOSEC OTC (LOT OF 5 BOXES) 42 TABS IN EACH BOX US $61.02
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 4boxes of 28 prilosec otc total of 112 tablets new in the box US $15.51
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 PRILOSEC OTC (3) Sealed Boxes of 14 Tablets (42 tabs) EXP: 5/2013 OMEPRAZOLE US $18.75
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 NIB Prilosec OTC Acid Reducer 168 Tablets Exp. 06/2014 or after 6 Boxes of 28ct US $69.95
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 Total 42 Tablets PRILOSEC OTC 3 Boxes 20 mg FREE SHIPPING US $17.99
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 PRILOSEC OTC 20.6MG TABLETS (2 BOXES OF 42 TABS ea) US $54.10
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 PRILOSEC OTC 42ct x 6 Boxes=252 tablets EXP 05/2014 US $143.99
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 prilosec OTC ( 8 boxes ) excellent dates US $10.50
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 Prilosec OTC 266 Tablets (11 Boxes) Exp. 10/2013 Brand New & Unopened US $51.00
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 Prilosec OTC - 42 Tablet Box NEW/SEALED ( EXP 08/2012 ) US $14.95
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 126 Prilosec OTC New Unopened Uncut 3 Boxes of 42ct US $.99
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 Prilosec OTC 42 count box US $15.00
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 168 Prilosec OTC New Unopened Uncut 6 Boxes of 28ct US $5.50
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 PRILOSEC OTC 20.6mg ACID REDUCER 3 BOXES 42 TOTAL TABLETS "FREE SHIPPING" US $24.99
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 NEW Prilosec OTC 42 Tablet Box - SEALED US $18.99
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 OTC OMEPRAZOLE 20mg. OLZEP 300 PILLS 3 BOXES PRILOSEC FORMULA OCID ACID REDUCER US $29.99
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 PRILOSEC OTC ( 700 TABLETS )...50 BOXES..14/per BOX for HEARTBURN 2014 DATES US $299.95
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 PRILOSEC OTC TABLETS. 8-14 TABLET BOXES. 112 TOTAL PILLS. ALL GOOD DATES US $19.95
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 OTC OLZEP 600 PILLS 6 BOXES OCID ACID REDUCER OMEPRAZOLE 20mg PRILOSEC FORMULA US $59.99
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 3 PACK PRILOSEC OTC 14 TABLETS EACH BOX HEARTBURN US $23.82
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 5 PACK PRILOSEC OTC 14 TABLETS EACH BOX HEARTBURN US $35.02
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 28 Ct PRILOSEC OTC Acid reducer 20 mg treats Frequent heartburn 2 Sealed boxes US $14.99
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 PRILOSEC OTC 42ct x4 Boxes=168 tablets EXP 10/2013 US $84.99
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 PRILOSEC OTC TABLETS 2 BOXES OF 14 NIB EXP. 2/2014 US $21.00
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 PRILOSEC OTC treats frequent heartburn 42 tablets new in box US $15.99
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 OTC OMEPRAZOLE 20mg OLZEP 1000 PILLS 10 BOXES OCID ACID REDUCER PRILOSEC FORMULA US $89.99
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 PRILOSEC OTC - 2 BOX LOT - EACH 42 TABLETS - TOTAL 84 TABLETS - EXP:8/12 US $33.99
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 Lot of 2 boxes Prilosec OTC 28 tablets total new in box US $14.99
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 Prilosec OTC qty 42 - 3 packs of 14 For Frequent Heartburn New Sealed Boxes US $34.95
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 Prilosec OTC acid reflux / heartburn medication 28 count box NEW SEALED !!! US $17.73
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 Prilosec OTC 42 Tablets New In Box Exp. 12/2013 US $19.30
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 New Sealed Prilosec OTC Mixed 42 28 14ct Boxes Acid Reducer 756 tablets 04/2014 US $324.00
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 Prilosec OTC 14 Tablets New In Box Exp. 3-2014 or Better US $7.59
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 Prilosec OTC 28 Tablets New In Box Exp. 2014 US $13.89
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Boxes Prilosec
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Plavix is an oral
plavix is an oral, thienopyridine class antiplatelet agent used to inhibit blood clots in coronary artery disease, peripheral vascular disease, and cerebrovascular disease. It is marketed by Bristol-Myers Squibb and Sanofi-Aventis. The drug works by irreversibly inhibiting a receptor called P2Y12, an adenosine diphosphate ADP chemoreceptor. Adverse effects include hemorrhage, severe neutropenia, and Thrombotic thrombocytopenic purpura (TTP).
Contents
1 Pharmacology
2 Clinical use
3 Indications
4 Dosage forms
5 Pharmacokinetics and metabolism
6 Pharmacogenetics
7 Adverse effects
8 Interactions
9 Marketing and litigation
10 References
11 External links
Pharmacology
Clopidogrel is a pro-drug whose action may be related to an adenosine diphosphate (ADP) receptor on platelet cell membranes. The drug specifically and irreversibly inhibits the P2Y12 subtype of ADP receptor, which is important in aggregation of platelets and cross-linking by the protein fibrin. The blockade of this receptor inhibits platelet aggregation by blocking activation of the glycoprotein IIb/IIIa pathway. The IIb/IIIa complex functions as a receptor mainly for fibrinogen and vitronectin but also for fibronectin and von Willebrand factor. Activation of this receptor complex is the "final common pathway" for platelet aggregation, and is important in the cross-linking of platelets by fibrin.
Platelet inhibition can be demonstrated two hours after a single dose of oral clopidogrel, but the onset of action is slow, so that a loading-dose of 300–600mg is usually administered.
Clinical use
Indications
Clopidogrel is indicated for
Prevention of vascular ischaemic events in patients with symptomatic atherosclerosis
Acute coronary syndrome without ST-segment elevation (NSTEMI),
ST elevation MI (STEMI)
It is also used, along with aspirin, for the prevention of thrombosis after placement of intracoronary stent or as an alternative antiplatelet drug for patients who are intolerant to aspirin.
International guidelines granted the highest grade of recommendation for NSTE-ACS, PCI and stent,for clopidogrel in addition to aspirin. Consensus-based therapeutic guidelines recommend also the use of clopidogrel, instead of aspirin, in patients requiring antiplatelet therapy but with a history of gastric ulceration, as inhibition of the synthesis of prostaglandins by aspirin (acetylsalicylic acid) can exacerbate this condition. A study has shown that in patients with healed aspirin-induced ulcers, however, patients receiving aspirin plus the proton pump inhibitor esomeprazole had a lower incidence of recurrent ulcer bleeding than patients receiving clopidogrel.However, a more recent study suggested that prophylaxis with proton pump inhibitors along with clopidogrel following acute coronary syndrome may increase adverse cardiac outcomes, possibly due to inhibition of CYP2C19 which is required for the conversion of clopidogrel to its active form.
Dosage forms
Clopidogrel is marketed as clopidogrel bisulfate (clopidogrel hydrogen sulfate), most commonly under the trade names Plavix, as 75 mg oral tablets.
Pharmacokinetics and metabolism
The active metabolite of clopidogrel
After repeated 75-mg oral doses of clopidogrel (base), plasma concentrations of the parent compound, which has no platelet inhibiting effect, are very low and are generally below the quantification limit (0.000258 mg/L) beyond two hours after dosing.
Clopidogrel is a pro-drug activated in the liver by cytochrome P450 enzymes, including CYP2C19. The active metabolite has an elimination half-life of about eight hours and acts by forming a disulfide bridge with the platelet ADP receptor. Patients with a variant allele of CYP2C19 are 1.5 to 3.5 times more likely to die or have complications than patients with the high-functioning allele.
Following an oral dose of 14C-labeled clopidogrel in humans, approximately 50% was excreted in the urine and approximately 46% in the feces in the five days after dosing.
Effect of Food: Administration of clopidogrel bisulfate with meals did not significantly modify the bioavailability of clopidogrel as assessed by the pharmacokinetics of the main circulating metabolite.
Absorption and Distribution: Clopidogrel is rapidly absorbed after oral administration of repeated doses of 75 mg clopidogrel (base), with peak plasma levels (appx. 3 mg/L) of the main circulating metabolite occurring approximately one hour after dosing. The pharmacokinetics of the main circulating metabolite are linear (plasma concentrations increased in proportion to dose) in the dose range of 50 to 150 mg of clopidogrel. Absorption is at least 50% based on urinary excretion of clopidogrel-related metabolites. Clopidogrel and the main circulating metabolite bind reversibly in vitro to human plasma proteins (98% and 94%, respectively). The binding is nonsaturable in vitro up to a concentration of 110 μg/mL.
Metabolism and Elimination: In vitro and in vivo, clopidogrel undergoes rapid hydrolysis into its carboxylic acid derivative. In plasma and urine, the glucuronide of the carboxylic acid derivative is also observed.
In March 2010, the U.S. Food and Drug Administration (FDA) added a boxed warning to Plavix alerting that the drug can be less effective in people who cannot metabolize the drug to convert it to its active form
Pharmacogenetics
CYP2C19 is an important drug-metabolizing enzyme that catalyzes the biotransformation of many clinically useful drugs including antidepressants, barbiturates, proton pump inhibitors, antimalarial and antitumor drugs. Clopidogrel is one of the drugs metabolized by this enzyme.
Several recent landmark studies have proven the importance of 2C19 genotyping in treatment using clopidogrel or Plavix. In March of 2010, the FDA put a black box warning on Plavix to make patients and healthcare providers aware that CYP2C19 poor metabolizers, representing up to 14% of patients, are at high risk of treatment failure and that testing is available.Researchers have found that patients with variants in cytochrome P-450 2C19 (CYP2C19) have lower levels of the active metabolite of clopidogrel, less inhibition of platelets, and a 3.58 times greater risk for major adverse cardiovascular events such as death, heart attack, and stroke; the risk was greatest in CYP2C19 poor metabolizers.
Adverse effects
.
Serious adverse drug reactions associated with clopidogrel therapy include:
Severe neutropenia (low white blood cells) (Incidence: 1/2,000)
Thrombotic thrombocytopenic purpura (TTP) (Incidence: 4/1,000,000 patients treated)
Hemorrhage - The annual incidence of hemorrhage may be increased by the co-administration of aspirin.
Gastrointestinal Hemorrhage (Incidence: 2.0% annually)
Cerebral Hemorrhage (Incidence: 0.1 to 0.4% annually)
Use of non-steroidal anti-inflammatory drugs is discouraged in those taking clopidogrel due to increased risk of digestive tract hemorrhage
Interactions
Clopidogrel interacts with the following drugs: proton pump inhibitors (except pantoprazole), phenytoin (Dilantin); tamoxifen (Nolvadex); tolbutamide (Orinase); torsemide (Demadex); fluvastatin (Lescol); a blood thinner such as warfarin (Coumadin), heparin, ardeparin (Normiflo), dalteparin (Fragmin), danaparoid (Orgaran), enoxaparin (Lovenox), or tinzaparin (Innohep); (Activase), anistreplase (Eminase), dipyridamole (Persantine), streptokinase (Kabikinase, Streptase), ticlopidine (Ticlid), and urokinase (Abbokinase). If you are using any of these drugs, you may not be able to take Plavix, or you may need dosage adjustments or special tests during treatment.
In November 2009, the FDA announced that clopidogrel should not be taken with PPIs such as Prilosec (omeprazole) and Nexium (esomeprazole).
Marketing and litigation
A box of Plavix
Plavix is marketed worldwide in nearly 110 countries, with sales of US$6.6 billion in 2009.It had been the 2nd top selling drug in the world for a few years as of 2007and was still growing by over 20% in 2007. U.S. sales were US$3.8 billion in 2008[
In 2006, generic clopidogrel was briefly marketed by Apotex, a Canadian generic pharmaceutical company before a court order halted further production until resolution of a patent infringement case brought by Bristol-Myers Squibb.The court ruled that Bristol-Myers Squibb's patent was valid and provided protection until November 2011.
Generic clopidogrel is also produced by several pharmaceutical companies in India. Clopidogrel is marketed by Sun Pharmaceuticals under the trade name Clopilet, by Ranbaxy Laboratories under the trade name Ceruvin, and under the name "Clavix" by Intas Pharmaceuticals and under the name "deplatt" by torrent pharmaceuticals. In India, it is sold as Clopigrel, Clopitab, Clopijoy, and Clasprin (mixed with aspirin).
Counterfeit Plavix is in circulation, as with many popular medicines.
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