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With generic drugs now making up nearly 70 percent of all medications prescribed in the US it is no surprise that the issues of bioequivalency and interchangeability of branded drugs and generics remained front and center this morning at the second day of the AAPS meeting.
 
The FDA has come in for a fair amount of criticism from companies and consumers alike. We wrote yesterday about the concerns about bupropion/Wellbutrin and Ambien but these are only two of the cases in which it has been questioned whether drugs certified by the FDA as bioequivalent are indeed therapeutically equivalent.
 
For a fairly comprehensive treatment of the alleged problems of non-bioequivalent generics , check out Glenn Lammi’s legal brief.
 
This morning, we had a chance to hear from the FDA and an explanation of when the agency believes there may be grounds to modify the current procedure for approving generics as bioequivalent.
 
Dr. Robert Temple, Director of the Office of Medical Policy at the FDA’s Center for Drug Evaluation and Research and Acting Director of the Office of Drug Evaluation I, argued that for the large majority of drugs bioequivalency is relatively straight forward but also walked through where differences between two drugs might or might not be indications of the potential for therapeutic efficacy differences.
 
 He opined that for two drugs that meet FDA bioequivalency standards, interchangeability depends on two factors: the sensitivity of the drug effects to differences in concentration and where one is on the dose response curve.
 
On the first point, it matters a lot whether a drug takes effect slowly or quickly, both in terms of the intended effect and the potential for side effects. When the drug is specially created to take effect quickly or to have high concentrations at certain times, testing the concentration at more time points is an important part of demonstrating that the two drugs really can be substituted for one another without big changes in the effects. Ambien is an example. Another is ADHD drugs which are designed to have high concentrations at some times and lower concentrations at others.
 
But Dr. Temple indicated that in the case of drugs that may take hours, days, or weeks to work completely, for instance antidepressants, beta-blockers, and coumadin, he felt it is highly unlikely that small deviations in concentration and release would have much of an impact on therapeutic effect. The shape of the curve, arguably, is not as critical.
 
That speaks against the complaints about Wellbutrin (bupropion) that we heard about, and wrote about, yesterday since the drug’s effects develop over weeks. Indeed, Dr. Temple attributed the complaints about the generic bupropion at least partially to patients blaming reoccurrence of symptoms to the drug change even though they would have returned whichever drug the patient was on. He made a similar argument about patients on anti-seizure medications who say that their seizures came back after they moved to a generic.
 
On the second consideration in determining whether existing bioequivalence standards are adequate, placement on the curve, Dr. Temple identified cases where the closeness of the pharmacokinetic profiles are important, generally where one is on the steep part of the curve. However, few drugs fall in this area, usually oncology drugs. He suggested that when one is on the plateau, differences in release rate are not very important, offering the example of drugs such as fluoxetine where the drug is equally effective at 20, 40, and 80mg doses and can be taken once a week with little difference in effect from taking it once a day.
                       
Dr. Temple challenged companies to undertake a trial using patients who say that they stopped getting symptom relief after they were moved to a generic version of their drug in order to determine whether there are actual differences in the concentrations of the drugs over time in a subgroup of patients. Yet, he said no one has shown interest in running such a study.
When patients are faced with the choice between a branded drug and a generic one – or find themselves put on a generic because their insurer is trying to save money – they are often reassured that the two medications are the same.
 
But the remarks this afternoon at the AAPS conference in Baltimore of Gerard Sanderink, Director of Metabolism and Pharmacokinetics at Sanofi-Aventis, brought into relief the question of exactly how different drugs can be and still pass the FDA’s current standards for bioequivalence.
 
And it’s a troubling picture.
 
Dr. Sanderink described how when Sanofi-Aventis decided to create an extended release version of Ambien that would work for an additional 3 to 5 hours in order to help patients remain asleep, the company tested 8 bi-layer formulations, comprising different proportions of the two included medications and different total doses.
 
Critical to Sanofi-Aventis was that the new pill would have three essential properties. It would offer patients the same quick absorption to help them get to sleep, it would offer medication to keep them asleep, and it would not leave any residual impairment in the morning.
 
One of the eight formulas “won” the aptly named Scheherzade trial and became what we now know as Ambien CR but what is interesting is what the other seven variations can tell us about the inadequacy of the FDA’s present procedure for approving generics as bioequivalent.
 
The winning formula took the crown in part because it left no lingering effects in the morning when compared to placebo. This was not true of some of the other formulas, which in some cases continued to have a residual impact long after the subject had woken up. As Dr. Sanderink’s presentation today showed, the pharmacodynamic profiles of the eight versions differed quite widely.
 
Yet, under the current FDA rules, all of the alternative Ambien formulations would pass a bioequivalence test against the chosen version. Right now, the agency only tests drug concentrations at 1.5 hours and then 1.5 hours to infinity.
 
That means that drugs that leave a lot more impairment in the morning can be sold as if they are identical to the original. And so can drugs that lack the properties of sleep initiation and sleep maintenance that make physicians and patients alike turn to Ambien CR.
 
Instead, Sanofi-Aventis wants the FDA to look at 0-3 hours, 3-6 hours, and 6 hours plus, covering the three important phases of the drug’s operation, initiation, maintenance, and wake-up.
 
I must agree with Dr. Sanderink: Classical bioequivalence criteria are insufficient, at least for this type of drugs, and the FDA should move to a more nuanced and tailored approach to evaluating whether generic drugs are sufficiently similar to the originals. To do otherwise is to do harm to patients, the companies that made the innovator drugs, and the agency’s own reputation.

It seems pretty clear that when patients who take Ambien CR to both fall and stay asleep are told their new generic will do the same thing, they won’t be satisfied with a pill that fulfills only half of that promise.
 
But that’s just what they may get with generic zolpidem. Ambien CR is specially formulated so that the medication it contains is dispensed so that patients both drop off and remain asleep so any variation in these concentrations can mean patients may wake up long before they want to.
 
Yet, the FDA only tests the concentration of generic zolpidem at 1.5 hours and then 1.5 hours to when the drugs stops being measurable in the system, which does very little to ensure that the drug concentrations match those of the branded drug over course of the 7 or 8 hours that it is patients’ systems. Especially since 90 percent of the drug enters the body after 1.5 hours.
 
Who thinks this is acceptable?
 
Similar concentrations at one single point is hardly strong evidence that the two drugs are actually bioequivalent.
 
What’s more, generics that dispense their contents in a different way can actually be dangerous since the drug may linger in patients’ systems longer than it should. That can mean day time sleepiness and reduced coordination.
 
Sanofi-aventis, which makes Ambien CR, has a simple solution and a reasonable request: test generics for the concentration during 0-3 hours, 3-6 hours, and more than 6 hours. As Gerard Sanderink of sanofi-aventis explained this afternoon, this would assure that the generic was bioequivalent on all of the main dimensions of Ambien CR, sleep initiation, sleep maintenance, and residual effects.
 
It’s a proposal that’s good for patients – and innovator companies. Why is the FDA dragging its feet?
 

The first sessions this afternoon at the AAPS Meeting focus on bupropion, otherwise known, in its branded form, as Wellbutrin. With the introduction three years ago of a generic for the antidepressant, patient switched to generic bupropion began to complain that the new drug was not working as well as the branded version had. They reported reduced control of their depression or even suicidal symptoms.
 
Theoretically at least, the two drugs were the same for all intents and purposes. The FDA had evaluated the data on the generic before approving it and certified that the branded and generic drugs were bioequivalent.
 
Yet, patients were reporting in increasing numbers, particularly online via patient advocacy sites, that this was not so. Now drugwonks and the Center for Medicine in the Public Interest are both on the record discussing why the internet is not a reliable source of data on medical information, and calculating prevalence of side effects is no exception to this.
 
However, the internet was not the only place that complaints were accumulating about generic bupropion. And an in vitro study done by one of the sites receiving these complaints revealed that 34 percent of the contents of the generic was being released in the initial two hours. That percentage was only 8 percent for the branded drug. Despite concerns about the bioequivalence of the two versions, the FDA reiterated that the two were the same.
 
Since then, this line has been maintained. One of this afternoon’s speakers, Dr. Paul Fackler, Vice President of Biopharmaceutics in Global Generic R&D at Teva Pharmaceutical, one of the companies making the drug and the first to produce a generic of bupropion, argued that the data does show that the release pattern of the drugs is indeed very similar.
 
There is one obvious source of doubt of this, despite Dr. Fackler’s lovely graphs, is that they are simulations, not creations of actual data. The argument for this is that only so much blood can be drawn from volunteer subjects so producing a full graph over the drug’s 20 hour half life is unfeasible. Yet, the simple fact that they are simulations leaves the numbers very open to questions.
 
The second issue, and one that has existed since the beginning of the controversy over the bioequivalence of branded and generic bupropion, is that the FDA tested only the 150mg dose, not the 300mg dose. As Dr. Fackler explained this afternoon, an in vivo waiver was granted on 300mg. With the larger dose being the target of many of the reports of therapeutic inequivalence, it seems short sighted of the FDA not have asked for data on 300mg after complaints began to stream in, if not during approval. 
 
Whether Wellbutrin and its generic actually are bioequivalent or not is not something that I can adjudicate this afternoon. But the AAP S meeting presentations have certainly highlighted that it is a controversy that remains undecided. And perhaps most worryingly, it is but one case that highlights the FDA’s unwillingness to engage with indications of lack of bioequivalence.
Well, the actual title of the conference is "Challenges and Opportunities in Establishing Scientific and Regulatory Standards for Assuring Therapeutic Equivalence of Modified Release Products".   But the core issue of the conference is whether the generic version of  extended release drugs -- used widely to treat pain, mental illness, Parkinson's, and bacterial infections -- deliver the medicine to the right place at the right time in the right amount.  Too much can be painful, even deadly.  Too little can cause setbacks.  The drug might be cheaper but the outcome is costly. 

To date no one has kept track of the total impact on patients. In part that's because until 2007 generic companies were not require by the FDA to monitor the effect of their products in the marketplace and only then it was limited to opioid based painkillers.  The increased use of generic lamotrigine is strongly associated with increased physician visits and hospitalizations. The same goes for switching patients to a generic version of other anti-convulsants, anti-depressants, etc.  

The key question of the conference is what can companies do to assure that all medicines affect us in more or less the same way.  As I have written before, one step in the right direction is to hold drugs that are supposed to have the same benefit and same risks to the same standards of post market evaluation.  Another approach, to be discussed by Gerard Sanderink of Sanofi will be how to use biomarkers to more precisely predict dose response and absorption of products in the earliest stages of development and periodically in the post market.  

The conference may seem mundane.  However the fact that Bob Temple is showing up indicates just how serious the FDA is about this issue.  And more generally, it underscores the fact that the public at large is unaware of the importance of how a drug is delivered.   Discovering a medicine is half the battle.  Making sure it is delivered safely and effectively is as important. 

Accordingly,  CMPI will be covering the AAPS conference "live" with bloggers and a video crew in a effort to "deliver" the modified release message in a way that it interesting and timely. 


The long-awaited and much anticipated draft guidance on REMS can be found here.

Also now available (and worth a careful read or two) is the FDA's strategic plan for risk communications.  Here's the press release, along with a link to the complete document.

FDA NEWS RELEASE

For Immediate Release: Sept.30, 2009

Media Inquiries: Christopher Kelly, 301-796-4676, christopher.kelly@fda.hhs.gov
Consumer Inquiries: 888-INFO-FDA

FDA Issues Strategic Plan for Risk Communication
Establishes framework for communicating with public about FDA-regulated products

The U.S. Food and Drug Administration today issued its Strategic Plan for Risk Communication, which outlines the agency’s efforts to disseminate more meaningful public health information.  The plan also lays out a framework for the FDA to provide information about FDA-regulated products to health care professionals, patients and consumers in the form they need it and when they need it, and for how the agency oversees industry communications.

“We are committed to improving communications the public receives about the products we regulate,” said Commissioner of Food and Drugs Margaret A. Hamburg, M.D. “The FDA must communicate frequently and clearly about risks and benefits and inform patients and consumers about ways to minimize risk as they become increasingly involved in managing their health and well-being.”

The plan defines three key areas–FDA’s science base, its operational capacity and its policy and processes – in which strategic actions can help improve the FDA’s communication about the risks and benefits of regulated products. The plan also identifies over 70 specific actions for the FDA to take over the next five years, including 14 that the agency commits to accomplishing over the next year. They include:

  • Designing a series of surveys to assess the public’s understanding of, and satisfaction with, FDA communications about medical products
  • Producing a research agenda for public dissemination
  • Creating and maintaining a useful, easily accessible internal database of FDA and other relevant risk communication research
  • Developing an expert model to characterize tobacco-use related consumer decision-making and better understand the likely impact of FDA oversight of tobacco products
  • Developing a “library” of multi-media communications on safe food practices for general education purposes and for use with crisis communications concerning food contamination episodes
  • Posting pictures of FDA- regulated products affected by Class I or high-priority Class II recalls as part of recall notices/information
  • Developing detailed action plans at the agency and center levels for implementing and achieving the proposed action steps, including timelines, responsibilities and resource needs

The plan reflects the FDA’s belief that risk communications must be adapted to the needs of different audiences and should be evaluated to ensure effectiveness. The plan also focuses on improving two-way communication through enhanced partnerships with government and non-government organizations, and focuses on policies that affect areas of high public health impact.

For more information:
FDA’s Strategic Plan for Risk Communication

Speaking of taxing “Cadillac” health plans, today’s New York Times reports that:

“The leading proposal in the Finance Committee would apply to family insurance plans that cost roughly $21,000 and up starting in 2013. For the sake of fairness, the threshold would vary based on geography and the average age of a company’s work force. In all, something like 10 percent of plans would be subject to the tax in 2013, according to the Center on Budget and Policy Priorities, a research group."

(The complete New York Times story can be found
here.)

60% of the American public gets their health benefits through their jobs -- and they’re not “free.” According to the Kaiser Family Foundation, the average American worker with “employer-provided” healthcare pays about 41% of the cost.

So – will benefits be taxed before or after the 41%? Clearly the answer is – before.

And as everyone’s favorite economist, Robert Reich, opines, "According to the Congressional Budget Office, taxing all employee health benefits would yield a whopping $246 billion every year. Even limiting the tax to higher-income employees would go a long way to funding universal health care. Employer-provided health insurance is the biggest tax break in the whole federal income tax system.”

The AFL-CIO’s Gerald Shea, the union’s top healthcare lobbyist, sees the definition of “Cadillac” shifting with time, “People are going to see this as a huge middle-class tax hit.”

The New York Times agrees:

“ … the number of affected plans would grow over time. The Senate has been talking about having the threshold rise each year by the inflation rate plus one percentage point. Since medical spending has been rising much faster than inflation, more and more plans would probably cross the threshold in the years after 2013. Over the next decade, the Congressional Budget Office has estimated that the tax would pay as much as 25 percent of the cost of extending coverage to the uninsured.”

And so does Robert Reich. “So a sensible and politically feasible alternative is to limit tax-free employer-provided health benefits to workers whose incomes are under, say, $100,000 a year, and subject those with higher incomes to progressively higher taxes on them."

Can you say, “mission creep?”

Reading Natasha Singer's article about the "safety" of Yaz and Yasmin -- two popular oral contraceptives I felt, as Yogi Berra would say, like it was deja vu all over again.   Where or where did Ms. Singer find her muse about the risks of birth control, I wondered? 

"...recently, the Yaz line’s image has been clouded by concerns from some researchers, health advocates and plaintiffs’ lawyers. They say that the drugs put women at higher risk for blood clots, strokes and other health problems than some other birth control pills do. Those critics, though, are up against a large European health study, sponsored by Bayer, the German pharmaceutical giant, that reported the opposite conclusion. The Bayer-financed study said that cardiovascular risks in women taking Bayer products were comparable to those taking an older formula of birth control pills."

www.nytimes.com/2009/09/26/health/26contracept.html

Hmm...

Here's a blog from a law firm leading the litigation against Bayer, the company that makes Yaz:

"The risks associated with this popular birth control pill are severe; many women who took Yaz or Yasmin have died or been seriously injured because of the serious health risks associated with the drug.  In fact, the FDA received over fifty reports of Yaz and Yasmin-related deaths between 2004 and 2008, most involving increased levels of potassium and occurring in women as young as 17 years old.  Imagine how many went unreported!  A growing number of lawsuits have been filed by or on behalf of these women, charging the drug manufacturer with inadequately warning them of the increased risks Yaz and Yasmin pose to those women who use the oral contraceptive.

While the public-at-large and many physicians may not recognize an adverse reaction to drospirenone, the health risks have been known for longer than many realize.  In 2002, the British Medical Journal reported some practitioners’ concern about the drug as a result of 40 cases of venous thrombosis among women taking it.  Also, in 2003, the Journal published a paper that detailed reports of thromboembolism deaths and injuries thought to be caused by Yaz and Yasmin.

www.nolan-law.com/yasmin-yaz-ocella-birth-control-injuries/#side%20effects

The FDA has been reprimanding Yaz and Yasmin manufacturers for misleading and inadequate television advertising for the drug for quite some time."

Here's Singer again... stoking the fires, fanning the flames, leading the witness...

"The health questions and the lawsuits may rattle consumer confidence, but the warnings from federal health authorities about advertising and quality control raise larger questions about Bayer’s approach to complying with government rules, said Michael A. Santoro, an associate professor at the Rutgers Business School who has studied ethics in the pharmaceutical industry. "


False Claims Act anyone?  That's the fulcrum  which the trial lawyers use to leverage meager findings about safety into a conspiracy of silence and misrepresentation.  

I see another Avandia in the making.  


Via the Pink Sheet:

The potential for physicians to favor innovator biologics over follow-on biologics because of a reimbursement advantage would be eliminated under an amendment to health care reform legislation adopted by the Senate Finance Committee Sept. 23.

The amendment, offered by Sen. Charles Schumer, D-N.Y., says the goal is "to ensure that patients and the Medicare program utilize biosimilars appropriately" and "create parity between brand name biologics and biosimilars and save patients and Medicare money."

The basic problem the amendment is trying to solve is the fact that, under current law, each biological product must have a separate billing code for reimbursement by Medicare Part B. Since the reimbursement rate under Part B is the average sales price of the drug plus six percent, if a biosimilar were introduced at a lower price than the innovator, there would be no incentive for physicians to use the lower-priced drug, since the six percent administration payment would be higher for the innovator. As a result, there would be no downward pressure on prices.

To eliminate this disparity, the amendment would provide equal administration fees for both the innovator, or reference product, and the follow-on biologic. The description of the amendment says a biosimilar approved by FDA and assigned a separate billing code would be "reimbursed at the ASP of the biosimilar plus six percent of the ASP of the reference product."

Brand Pharma May Dodge A CBO Bullet

The committee adopted the amendment by unanimous voice vote, and brand pharma stalwarts Sens. Orrin Hatch, R-Utah, and Michael Enzi, R-Wyo., joined as co-sponsors.

Brands may be supportive of the idea of reimbursement parity for physicians because, if treated as the fix Medicare needs to accommodate FOBs, it would mean that brands avoided potentially much more consequential modifications to the program.

The Congressional Budget Office has previously suggested that there would be additional savings from follow-on biologics if they are put on equal footing with innovators in government health care programs, not just in terms of physician reimbursement, but product coding as well, which would mean that brands would be reimbursed at the FOB price.

In a December 2008 score of legislation options, CBO said that putting a biosimilar in the same reimbursement code as its brand-name counterpart would save the government $10.6 billion over 10 years, about 30 percent more than the $8.1 billion it would save if they were not in the same code.

Many observers believe that such a coding change would need to be made by statute, and that without it Medicare would never fully embrace FOBs. Indeed, while the Schumer amendment removes a disincentive to prescribing FOBs, it does not seem to create an incentive for their use either.

The Road Not Taken

  • 09.28.2009
Neurologist David Alway has written an excellent piece explaining the logical fallacy in having government be the arbiter of allocating resources in the practice of medicine.

Dr. Alway concludes by boiling the entire debate down to two choices before us:

“There is a choice to be made. One road leads to greater individual rights, freedom, productivity, good doctor-patient relations, further advances in health care, and better lives. The other leads to statism, government control of the individual, falling levels of productivity, a lack of innovation in medicine, drone-like doctors and nurses, and ultimately, more death.”

For the sake of future Americans, let us hope and pray that we take the first road.

CMPI

Center for Medicine in the Public Interest is a nonprofit, non-partisan organization promoting innovative solutions that advance medical progress, reduce health disparities, extend life and make health care more affordable, preventive and patient-centered. CMPI also provides the public, policymakers and the media a reliable source of independent scientific analysis on issues ranging from personalized medicine, food and drug safety, health care reform and comparative effectiveness.

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