warfarin vs. Coumadin, 2nd verse (long)

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catwoman

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After the discussion elsewhere last week about generic vs. trademarked warfarin, I asked a friend this weekend which form he takes. He had MVR in July 2004.
He said generic.
My friend kind of has a medical background. He formerly owned a business in the medical profession, sold it and retired a number of years ago at an early age.
He went on generic warfarin after his MVR (July 2004) and told me it took 5-6 months for his INR to stabilize. It's been stable since, and he takes about 2.5mg.

So today I did some investigation online about warfarin, Coumadin. Quite, quite interesting.

I found:

1. the question I asked here in 2003 when I wanted to switch to generic from Coumadin, which my PCP's office was insisting I take.
2. references to the multi-million-dollar suit (I think about $44+ million) that DuPont lost over the marketing strategy it used against the generic.
3. history of the generic drug industry n the U.S.
4. a study that found that switching from name-brand to generic does not alter a patient's INR. (quite interestingly, two people from Bristol Myers Squibb -- mfr of Coumadin -- were the investigators.)
and more.

Most people who say their INRs are unstable while on warfarin are most likely just a few weeks/months post-op (I bounced around even on Coumadin!); are probably given dosage changes that are too high/too low/tested too frequently; yaddayaddayadda.

For your bedtime reading, here are some results of my research:

http://www.valvereplacement.com/forums/showthread.php?t=587&highlight=warfarin+coumadin


My question on comparing warfarin & Coumadin, from 10/22/2003:

http://www.valvereplacement.com/forums/showthread.php?t=5042&highlight=warfarin+coumadin

Marty?s thread from 4/2/2004 on results of switching from Coumadin to generic:

http://www.valvereplacement.com/forums/showthread.php?t=6929&highlight=warfarin+coumadin


2/8/2005 from Al Lodwick:

In the last 10 years the company that makes Coumadin has changed 3 times. Only the name has remained the same. I wonder how many times the name Coumadin ahs been sold since the 1950s and how different the equipment that makes is now from what it was then. I don't that the doctors said Coumadin was better. It is just that the doctors have believed the advertising and not the studies in journals. These are the same doctors who are training new doctors to go with what the studies in journals show and forget about advertising. I'll agree that prior to 1990 it made sense to say that Coumadin was better. I said it back then. However, the technology is so different now that all manufacturers make excellent products. In fact one study showed that Barr exceeded Coumadin in uniformity of tablets.
__________________
Al Lodwick, R.Ph.
Certified Anticoagulation Care Provider
Go to my website for warfarin information


Anticoagulation

Generic Warfarin Sodium Has Same Effects as Coumadin


May 4th, 2000

Switching patients from Coumadin (Dupont Pharma) to a generic warfarin sodium product does not alter patients' International Normalized Ratio (INR).

C.N. Swenson and G. Fundak of Bristol Myers Squibb Co. investigated whether patients could be safely and effectively switched from Coumadin to a generic warfarin sodium produced by Barr Laboratories ("Observational cohort study of switching warfarin sodium products in a managed care organization," American Journal of Health - System Pharmacy, 2000;57(5):452-455).

The subjects for the study were managed care organization patients who regularly visited two anticoagulation clinics. ...

Source: Blood Weekly (2000-05-04)

Abstract on above:

http://pt.wkhealth.com/pt/re/ajhp/a...306p9QL1c5hLnpg2t!928310026!181195629!8091!-1

On Barr Pharmaceuticals (interesting read about warfarin):

Key Dates:
1970: Barr is founded in New York.
1972: The company introduces its first generic drug.
1994: Bruce Downey is named CEO of Barr and heads up the company during the ensuing period of litigation with the FDA.
2003: Barr Labs is reincorporated, becoming a subsidiary of the Pharmaceuticals holding company.


Company History:
A fast-growing generic drug company, Barr Pharmaceuticals, Inc., develops, manufactures, and markets generic and proprietary pharmaceuticals. The heart of the company and its original focus was on the generic side, a fast-growing segment of the general pharmaceutical industry in which Barr was one of the early pioneers. The company earned notoriety during the late 1980s, when its founder testified before a congressional committee about bribes between generic drug producers and U.S. Food & Drug Administration officials. Barr began to realize phenomenal financial growth during the 1990s, when the U.S. generic pharmaceutical industry grew from a $4-billion-a-year business to an $11-billion-a-year business. By targeting drugs it considered to be covered by weak patents, Barr scored major successes, such as the right to distribute the cancer drug tamoxifen citrate, which accounted for roughly 75 percent of the company's sales during most of the 1990s. During the late 1990s the company's product line was focused on several therapeutic categories, including anti-infectives, cardiovascular agents, hormonal agents, analgesics, oncology, and psychotherapeutic products. At manufacturing facilities in New York, New Jersey, and Virginia, Barr produced more than 60 drug products, including proprietary pharmaceuticals, which the company began manufacturing in 1998.
Industry and Company Origins
Barr was founded in 1970 as a generic pharmaceutical concern based in New York. At the time of the company's formation, the generic drug industry was in its infancy, having first gained legitimacy as a business during the mid-1960s. The catalyst for the industry's emergence was the Drug Efficacy Study Implementation (DESI) program conducted by the National Research Council of the National Academy of Sciences in 1962, which evaluated all drugs that had been approved for use prior to 1962. The DESI evaluation reviewed more than 3,000 products, determining which products were effective and which were ineffective. Those products that gained the DESI stamp of approval paved the way for a new breed of drug makers: generic manufacturers. With a list of products deemed effective by the National Research Council, generic drug companies could manufacture a product according to the prescribed chemical formula and mark the product without additional study, eliminating the need for the costly and time-consuming biostudies conducted by proprietary drug makers. Barr, founded by Edwin A. Cohen and a partner, became one of the early contenders in the generic drug industry when it introduced its first product in 1972.
Initially, Barr concentrated on making antibiotic products, manufacturing generic drugs primarily for other pharmaceutical companies, such as Lederle Standard Products. For more than a decade Barr remained a small enterprise without the ability to realize much financial growth. The restraints on the company's growth stemmed from the immaturity of its industry, which had sprung to life in the wake of the DESI program but retained its fledgling characteristics until the mid-1980s. The turning point in the generic drug industry's evolution occurred when the Drug Price Competition and Patent Restoration Act was promulgated in 1984. Also referred to as the Waxman-Hatch Act, the legislation allowed the production of generic versions of all pharmaceutical products approved after 1962, provided the generic manufacturer could prove the generic version was equivalent to the branded version. The ruling ignited the generic drug industry's growth, ushering in a new era of frenetic expansion and signaling what observers regarded as the beginning of the modern generic pharmaceutical industry. In the first year following the approval of the Waxman-Hatch Act, more than 1,000 applications for new generic drugs were received by the U.S. Food & Drug Administration (FDA), as scores of new generic producers scurried to secure the decisive rights to be the first to market generic equivalents of branded pharmaceuticals. For an industry long held in check, however, the forces that unleashed its potential nearly caused its ruin. Scandal, bribery, and a litany of criminal accusations followed the passage of the Waxman-Hatch Act, staining the image of generic drug producers and the FDA. At the center of the maelstrom of controversy were Barr and its founder, Edwin Cohen.
Crime and Punishment in the Late 1980s
Much of a generic drug producer's success depended on being "first to market," a race that began with the submission of detailed information to the FDA concerning the bioequivalence of a generic alternative, that is, providing proof that the generic drug had the same therapeutic effects as the branded version. Once FDA approval was obtained, a generic producer could introduce its generic alternative into the market, but in the wake of the Waxman-Hatch Act many began to question the FDA approval process, particularly Cohen. Cohen approached the FDA in 1987 and 1988, accusing the agency of favoring his competitors, complaining that other generic producers were securing approval while his applications languished on the desks of FDA officials. Part of Cohen's frustration stemmed from Barr's attempts to market its generic version of erythromycin estolate, an antibiotic. Barr submitted an application for the antibiotic in January 1987 and a short time later the FDA agreed that the company's drug was bioequivalent, but numerous delays followed. By the end of 1987 Cohen still had not received approval for the antibiotic, so he complained to the FDA. By the end of 1988 approval still had not arrived, prompting Cohen to voice his complaints again. The FDA never responded to Cohen's accusations, but in mid-1989 Cohen found someone who would listen. In May 1989 the House Subcommittee on Oversight asked Cohen to testify against the FDA during its investigation of the generic drug industry.
Cohen testified before the congressional committee that FDA officials were accepting bribes from generic drug producers to quicken the approval process. Because of the committee's nearly three-year investigation, more than 40 FDA employees and company executives pleaded guilty to or were convicted of fraud or corruption charges. Of the 52 generic drug producers examined during the investigation, only five, including Barr, were not implicated in the scandal. Although Cohen had helped expose rampant corruption, his triumph did not benefit Barr--if anything, it exacerbated relations with the FDA. By early 1990 Barr still had not received approval for its generic version of erythromycin estolate. Cohen believed the delays were retribution for his testimony in front of the congressional subcommittee and his complaints against the FDA, so he filed a lawsuit against the agency. The antibiotic at last was granted approval in October 1990, nearly four years after the application was submitted, but the end of the long wait did not mark the end of Barr's problems with the FDA. After failing to force Barr to suspend manufacturing and distribution pending the resolution of certain regulatory disputes, the FDA put Barr on its "alert list" of pharmaceutical manufacturers who did not conform to FDA standards. Barr filed another lawsuit in April 1992, contending that its inclusion on the alert list was preventing the company from winning approval on roughly 90 new drugs. Two months later the FDA dropped Barr from its alert list.
There was ample cause for Cohen and other Barr officials to eliminate any impediments to new product introduction as the 1990s began. At stake were billions of dollars of business, business to be won by those generic producers who could identify prime pharmaceutical drugs to produce and then move expeditiously through the FDA approval process. Between 1991 and 1996, patents were to expire on a host of prescription drugs whose aggregate value was estimated at $10 billion in sales. At the time this potentially lucrative five-year period was set to begin, the U.S. generic drug industry was a $4-billion-a-year business and Barr was a $70-million-in-sales company; both were poised for prolific growth. Barr's first major victory during this period was its challenge on the patent for tamoxifen citrate, a breast cancer treatment that became the financial foundation upon which the company rested. Tamoxifen, which Barr distributed but did not produce, accounted for three-quarters of the company's sales during the 1990s and represented an early sign of the company's willingness to dispute the patents of large drug companies. As Barr moved forward during the generic drug industry's decade of opportunity, it focused on drugs that were hard to copy in order to reduce competition and, more notoriously, it earned a reputation for challenging what it considered weak patents. Aggressive and persistent, Barr displayed no reluctance to avoid fiercely contested legal disputes, even on the heels of its fractious battle with the FDA.
Energetic Growth During the 1990s
Beginning in 1993 Barr recorded a five-year period during which annual sales increased an average of 35 percent per year. Much of this growth rested on the shoulders of tamoxifen, which contributed roughly 75 percent of the company's total sales during the period, but the financial success also was attributable to Barr's progress with other drugs, progress achieved after butting heads with some of the country's biggest drug makers. To lead the company forward during this volatile period was Bruce L. Downey, who became Barr's president, chief operating officer, and a member of the company's board of directors in January 1993. Cohen relinquished his title of chief executive officer in early 1994 and was replaced by Downey in February 1994. In Downey, Barr gained a leader well equipped to handle the litigious future it faced. A former partner in the law firm of Winston & Strawn, Downey had served as the lead attorney during Barr's legal battle with the FDA, which would serve him well as Barr pursued its strategy of challenging the patents of larger drug companies.
After smoothing over relations with the FDA in 1995, Barr earned FDA approval to sell a generic version of the AIDS drug AZT. Before the company could market its product, however, it had to win court approval to overturn existing patents, held by Glaxo Wellcome. The legal battle over Barr's generic AZT was just one of several ongoing patent challenges that Downey directed during the middle and late 1990s, including the company's 1996 challenge of the patent held by Eli Lilly for Prozac, which collected $6 million in sales daily. Meanwhile, as Barr contested various patents in the courtroom, its success outside the courtroom was solid. Financially, the company had suffered during its long dispute with the FDA, entering the 1990s with $70 million in annual sales and watching that total drop to $58 million by 1993. From 1993 forward, however, sales climbed robustly, swelling to $109 million in 1994, $199 million in 1995, and $232 million by 1996. With managed care organizations growing in number and prominence amid escalating health care costs, generic drugs were becoming more sought after than ever before. Evidence of this rise in demand was illustrated at Barr in 1996 when the company purchased a 65,000-square-foot manufacturing facility in Forest, Virginia, to complement its existing facilities in Pomona, New York, and Northvale, New Jersey.
Downey led the company's charge against DuPont Merck Pharmaceutical Company, which petitioned the FDA in September 1996 for a stay of action against Barr's warfarin sodium, an anti-coagulation agent that was the generic equivalent of DuPont Merck's Coumadin. DuPont Merck fought a state-by-state battle to prohibit the distribution of Barr's generic version of Coumadin, trying to keep the $500 million in sales it collected from Coumadin to itself. Barr received FDA approval in March 1997 and began shipping its warfarin sodium tablets in July 1997, accumulating $15 million in sales during the first month, as DuPont Merck's attempts to stop distribution continued into 1998.
Thanks to its encouraging sales growth, Barr entered 1997 ranked as one of the top ten generic drug makers in the country. Its role as an industry whistle-blower had weakened its stock performance during the late 1980s and early 1990s, but by the late 1990s the company was drawing praise from Wall Street. One stock analyst noted: "Not every company can do well if the industry is doing well. Barr is a major turnaround company in the industry. They went through some tough times, but have since turned around ... Barr is getting a reputation of being aggressive in litigation and patent challenging. Barr is willing to take on Goliath."
Taking on larger pharmaceutical companies continued to be a major focus of the company's strategy as it competed in the late 1990s, but in 1997 it added another facet to its operations by launching a proprietary pharmaceutical development program. Research and development spending increased as a result, jumping 54 percent in 1997 to $10.4 million and another 40 percent in 1998 to $19 million. "R&D [research and development] spending is the future," Downey declared, "and the last thing we'd cut. It leads to the most earnings and in the fastest way." Less than 18 months after launching its proprietary development program, Barr introduced its first product, a contraceptive codeveloped with Gynetics, Inc. Approved by the FDA in September 1998, the product was the PREVEN Emergency Contraceptive Kit, which contained an information booklet, a pregnancy test, and four high-dosage birth control pills. According to the partnership agreement between the two companies, Barr manufactured the pills and Gynetics marketed the product, billing it as a postcoital "morning-after" product, the first FDA-approved product specifically designed for such use.
Aside from celebrating its first success in proprietary drug development, Barr officials could point to other favorable developments that suggested a bright future for the company. Financially, Barr was performing admirably, registering a 68 percent increase in net earnings in 1998 to $32.7 million and a 33 percent increase in revenues to $377.3 million, more than six times the total collected five years earlier. With a number of potentially lucrative generic products expected to be introduced once approval was granted, Barr's generic business was as strong as ever, while its new proprietary business, which had four proprietary products in various stages of development in late 1998, provided a promising avenue for future growth. Downey was overjoyed by Barr's success, declaring, "By all measures, 1998 represents the most successful year in our company's history."
The 2000s and Beyond
Barr set its sites on acquiring patents for Prozac in 1999, filing suit to gain the mechanism of action patent as well as the use patent, but were defeated in court. The Warfarin legal struggle, however, was settled in Barr's favor, and the company moved forward with its plan to carry the nine different varieties of Warfarin developed by Du Pont Pharmaceuticals. They also won the right to manufacture the drug Tamoxifen when its patent expired in 2002, with market exclusivity for a 180 day period. By year's end Barr had won approval from the FDA to market the generic version of Bristol-Myers Squibb Company's Duricef Capsules, and had received excellent news from the Florida State legislature, who had unanimously approved the use of generic drugs in place of brand-name products, so long as the generics had FDA approval.
Even better news came with January 2000. Drug maker DuPont and Barr announced a termination of their continuing feud over Warfarin and declared an alliance to create and market new drugs. DuPont planned to invest 45 million dollars into a trio of proprietary Barr drugs in exchange for royalties from the products and a share of Barr stock. Things did not remain as rosy in the stock market though. While Barr won the right to manufacture a generic form of Prozac and market it exclusively for 180 days, their stock plummeted some 16 percent in March 2001 when it was announced that a special extension awarded Eli Lilly would be permitted by the FDA to overlap Barr's 180 day exclusivity.
Better news came soon, though, with the release of the joint venture with DuPont to market Trexall, a drug designed to aid rheumatoid arthritis and other ailments. April brought news of the FDA's approval for Barr to market a generic form of the oral contraceptive Ortho Novum. By June 2001 Business Week could truthfully report that Barr remained a "hot company," citing its stock prices, which had risen 189 percent above its numbers in 1999. Certainly grown seemed in its future, for later in June Barr Laboratories announced that it would be acquiring rival drug firm Duramed Pharmaceuticals Inc. for a $571 million stock swap. This fell in line with CEO Bruce Downey's plans to aim Barr toward branded drugs rather than focusing solely upon generics, an often unpredictable industry. His strategy certainly seemed to pay off: by the third quarter of 2002 company earnings had risen 64 percent. Propelled by its generic version of Prozac, the company achieved its most successful financial investments yet by the fourth quarter of 2002.
In February 2003 Barr made plans to relocate its executive offices to another facility in Bergen County New Jersey. Moreover, the company was reorganized, making Barr Labs a wholly owned subsidiary of the new holding company Barr Pharmaceuticals. Throughout 2003 Barr steadily gained approval for and launched new generic versions of other drugs, among them Accutane, an drug for treating severe acne, Loestrin, an oral contraceptive, Niaspan 1,000 mg extended-release tablets, and the so-called "morning-after pill" Plan B. By December 2003, after another year with strong financial gains, Barr moved to acquire Endeavor Pharmaceuticals Inc. Endeavor was the developer of the synthetic estrogen product Enjuvia. Things were little different in 2004--Barr continued to seek approval for generic versions of drugs from the FDA. Often legal action was required to obtain a patent, and sometimes Barr was challenged but the company remained very competitive and financially sound.
Principal Subsidiaries: Barr Laboratories Inc.; Duramed Research Inc.
Principal Competitors: Watson Pharmaceuticals Inc.; Johnson & Johnson; Wyeth; Mylan Laboratories Inc.

Interesting lawsuit:

http://caselaw.lp.findlaw.com/data2/circs/2nd/029222p.pdf
 
Interesting reading.

I recently started switching to warfarin after VA stop supplying me Coumadin unless I allowed them to do the INR testing. I've never allowed VA to control INR or test me. Warfarin is $10 for 90 days. I've been paying VA $24 for 90 days for Coumadin.
 
Mark, it would be cheaper to take a 7.5 every day and a 1 every other day.

Marsha, for a year after surgery, I took Coumadin and like most people, bounced around for awhile before stabilizing. Then I switched to Warfarin and began bouncing again so my doctor insisted I return to Coumadin, and actually I did stabilize again. I stayed on brand name for several years with no issues. About 3 years ago I started taking Barr (at the advice of others on this site) and have been stable. I don't remember the type that I took in the beginning, but I know it was shaped like a dog bone (similar to Maxzide, which I took presurgery). I can't find anything online about a Warfarin pill shaped like this, so I assume they either aren't made anymore, or are oval like most of the other generics. Remember, generic had only been approved in the US in 1997, and this was 1999, so I'm thinking they weren't all equal at that time.
 
yata yata

1. no problem with indian generic meds, as long as you're getting them
through a reliable online/mail order pharmacy. you probably want to avoid
the ones that send out junk mail, or have websites such as
heydudesgetyourtwelveinchlongerlastingpenishereandmakehersqueal.com

if you were using chinese meds, then you might have a problem. meds here
are kinda iffy, the doctor advised me to use the stuff i brought back from
india before considering using chinese warfarin. when i finally did, i bought
from the hospital pharmacy. even then i found it to be inert. the next
several weeks my testing (hahaha, assuming the chinese tests are valid!)
showed me basically unanticoagulated. on aspirin now. yay.

2. the change in dose you made, and the change in results are insignificant.
that's what, a 5% increase, and only two days between tests? and then change
from 2.0-2.1? you've also got other factors, such as exercise, diet, stress that
would affect your test values more.

3. are you still testing with the machine you think might be more accurate,
or maybe just more reliable, than the other machine? have you gotten any
professional lab tests done?
 
Mark:
You had a ? before reliable. As I recall, from a statistics class taken eons ago, validity=it does what it is supposed to do and reliability=it does the same thing time after time. Hope this helps.

Also, I was wondering what manufacturer did you call? What did you have to do to get them to give you information on the ProTime? Do you know how they knew when the last test was done? When I had some problems with our ProTime, about three years ago, I called QAS and they helped me out.

Blanche
 
Mark:
You had a ? before reliable. As I recall, from a statistics class taken eons ago, validity=it does what it is supposed to do and reliability=it does the same thing time after time. Hope this helps.

Also, I was wondering what manufacturer did you call? What did you have to do to get them to give you information on the ProTime? Do you know how they knew when the last test was done? When I had some problems with our ProTime, about three years ago, I called QAS and they helped me out.

Blanche
At one time, I misplaced my manual for my ProTime 3 and QAS provided me a new one. What I was most concerned about was the list of all the error codes -- "just in case."
 
Finally - the warfarin I get is from a reliable (?) pharmacy - AllDayChemist.com.

i've ordered through them before. no problems whatsoever. all the meds
seemed to work properly. ace inhibitors inhibited my aces, beta blockers
blocked my betas, and the statins, um, stained, um, strained, uhhh, statinned
my statins. (and the viagra is good for 9x:eek:)
 
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