Vicodin Side Effects Information
Vicodin Liver Failure Injury
The primary topic area for discussion is how to address the public health problem of liver injury related to the use of acetaminophen in both over-the-counter (OTC) and prescription (RX) products such as Vicodin side effects lawsuit.
FDA recognizes that acetaminophen is an important drug used to treat pain and fever in both settings and is not seeking to remove it from the market. The risk of developing liver injury to the individual patient who uses the drug according to directions is very low. However, acetaminophen containing products such as Vicodin side effects lawsuit pills are used extensively making the absolute number of liver injury cases a public health concern.
Acetaminophen is one of the most commonly used drugs in Vicodin and the United States,1 yet it is also an important cause of serious liver injury. The Acetaminophen found in Vicodin and thus causing side effects such as liver failure is the generic name of a drug found in many common brand name over-the-counter (OTC) products, such as Tylenol, and Prescription (Rx) products, such as Vicodin and Vicodin. Acetaminophen is an important drug, and its effectiveness in relieving pain and fever is widely known. Unlike other commonly used drugs to reduce pain and fever (e.g., nonsteroidal antinflammatory drugs (NSAIDs), such as aspirin, ibuprofen, and naproxen), at recommended doses acetaminophen does not cause adverse effects, such as stomach discomfort and bleeding, and acetaminophen is considered safe when used according to the directions on its OTC or Rx labeling. However, taking more than the recommended amount can cause liver damage, ranging from abnormalities in liver function blood tests, to acute liver failure, and even death. Many cases of overdose are caused by patients inadvertently taking more than the recommended dose (i.e., 4 grams a day) of a particular product, or by taking more than one product containing acetaminophen (e.g., an OTC product and an Rx drug containing acetaminophen).
The mechanism of liver injury is not related to acetaminophen itself, but to the production of a toxic metabolite. The toxic metabolite binds with liver proteins, which cause cellular injury. The ability of the liver to remove this metabolite before it binds to liver protein influences the extent of liver injury. In a study that combined data from 22 specialty medical centers in the United States, acetaminophen-related liver injury was the leading cause of acute liver failure for the years 1998 through 2003.2 Patients in this study were found to have taken too much acetaminophen from OTC, Rx products, or both. Almost half of these cases involved overdose in which the patient had not intended to take too much acetaminophen (unintentional overdoses), although many cases of liver injury with acetaminophen result from self-harm, i.e., intentional self-poisoning. The high percentage of cases of liver failure related to unintentional acetaminophen overdose was also observed in a study published in 2007.3 The extent of liver failure cases reported in the medical literature provides an important signal of concern. However, the types of databases available to identify cases make it difficult to determine the full extent of the problem or whether interventions have been successful.
A. Why Vicodin Side Effects Acetaminophen Overdoses Occur
There are few data available describing consumer behavior with acetaminophen products or consumer understanding of acetaminophen toxicity. However, based on the prevalence of liver injury, it appears that there are distinct factors associated with acetaminophen and acetaminophen products such as Vicodin that contribute to this public health problem. These factors are listed below.
Taking just a small amount of acetaminophen over the recommended total daily dose (4 grams per day) may lead to liver injury.4 Currently recommended doses and tablet strengths of acetaminophen leave little room for error and the onset of liver injury can be hard to recognize. There is scientific agreement that taking a large amount of acetaminophen over a short period of time causes liver injury, but there is limited agreement as to the specific threshold dose for toxicity. In addition, the onset of symptoms associated with acetaminophen Vicodin Side Effects liver injury can take several days, even in severe cases. The symptoms of liver injury may not be readily identified by an individual because they may be non-specific and mimic flu symptoms. The antidote for acetaminophen poisoning, N-acetylcysteine, is less effective when liver injury has progressed too far.
Some individuals may be especially sensitive to liver injury from acetaminophen. The maximum safe dose may not be the same for all persons. Individuals with increased sensitivity may experience toxic effects at lower acetaminophen doses. Available information suggests that some individuals, such as those who use alcohol or have liver disease, may have a greater sensitivity to the effects of the toxic metabolite because they produce more or are unable to clear it from the body as easily. More research is needed to understand whether ethnicity, genetics, nutrition, or other factors might have a role in making some individuals more sensitive to Vicodin Side Effects.
There is a wide array of OTC and Rx acetaminophen products used in a range of doses for various indications. For some people, it may be difficult to identify the appropriate product to use. Acetaminophen is in many widely used OTC single ingredient products, such as those to treat headaches, and multiple ingredient (combination) products, such as those to treat symptoms of the common cold, like aches and fever. Acetaminophen is also a component of a number of Rx drug products in combination with narcotic pain medicines. So, consumers may reasonably attempt to treat different conditions or symptoms with multiple choices among products containing acetaminophen, but may not realize that acetaminophen is an ingredient common to each.
It can be difficult to identify acetaminophen as an ingredient in Vicodin. Rx products that contain acetaminophen (usually with codeine or oxycodone) are often labeled as containing ‘‘APAP’’ on pharmacy dispensed containers.5 Without clear labeling, patients may take more than one product containing acetaminophen (e.g., a Rx product and an OTC product) without realizing it, and in some cases take a harmful percoset overdose.
Multiple products exist for children containing different strengths. Liquid acetaminophen formulations intended for use in infants are typically more concentrated (i.e., stronger) to enable proper dosing using less liquid. However, failure to distinguish between the two strengths of liquid can result in an accidental overdose where the parent gives a higher dose of the concentrated drops to a younger child.
The association between acetaminophen and liver injury is not common knowledge.6 Consumers are not sufficiently aware that acetaminophen can cause serious liver injury, and their perceptions may be influenced by the marketing of the products. Finding ways to educate consumers about the risk of liver injury from acetaminophen has been difficult. Current labeling on OTC products may be overlooked, as can the patient information provided with dispensed prescriptions. Programs to educate the public about safe use of acetaminophen have been small and encountered a number of obstacles. Advertisements of OTC drugs often emphasize the effectiveness of products, but are not subject to the same requirements to offset such messages by providing warning information as prescription products. Also, acetaminophen is available in retail outlets in large quantities (e.g., 500 tablets per bottle) which may contribute to the perception that the ingredient is unlikely to be harmful.
B. FDA’s Previous Actions
In the late 1990s, research began to show that acetaminophen was a major cause of acute liver failure in the United States, with up to half of the cases due to accidental overdose. Responding to these concerns, FDA took a number of steps to reduce the incidence of liver injury related to acetaminophen.
In 1998, FDA finalized a regulation that required all OTC acetaminophen products to include an alcohol warning in labeling. The warning stated: Acetaminophen. ‘‘Alcohol Warning’’: ‘‘If you consume 3 or more alcoholic drinks every day, ask your doctor whether you should take acetaminophen or other pain relievers/fever reducers. Acetaminophen may cause liver damage.’’
In 2002, FDA convened an Advisory Committee meeting to discuss unintentional liver toxicity related to the use of OTC acetaminophen.7 The Advisory Committee recommended a specific liver toxicity warning and distinctive labeling on OTC packages so that products containing acetaminophen could be more easily identified. FDA and manufacturers were also advised to educate consumers and health professionals about the risk of liver injury from acetaminophen.
In early 2004, FDA launched a public education campaign to help consumers use acetaminophen and Vicodin more safely. By most standards, the campaign would be considered small, due to budgetary constraints. It was also limited by reluctance on the part of some commercial outlets to provide a venue for FDA’s message about acetaminophen toxicity as the product was sold or promoted in those outlets. Nonetheless, FDA has continued to expand efforts to improve public education about acetaminophen overdosing and liver injury and has recently updated the acetaminophen information on FDA’s Web site.
In 2004, FDA sent letters to every state board of pharmacy asking them to consider requiring labeling on the immediate container of Rx products containing acetaminophen that: (1) uses the term acetaminophen, not APAP, (2) instructs patients to avoid concurrent use of other acetaminophen containing drugs, (3) instructs patients not to exceed the maximum daily recommended acetaminophen dose, and (4) instructs patients to avoid drinking alcohol during prescription use.8 FDA was informed by the National Association of Boards of Pharmacy that, as of February 2008, no states had implemented regulations related to the request.
In December 2006, FDA issued proposed regulations for OTC labeling for acetaminophen containing products such as Vicodin to require inclusion of new safety information and that the container and outer carton identify acetaminophen when it is an ingredient.9 The final version of the regulation is currently under review.
In 2007, the Director of FDA’s Center for Drug Evaluation and Research (CDER) convened a multidisciplinary working group in CDER to continue to evaluate the issues associated with acetaminophen and Vicodin side effects related liver injury and consider additional steps FDA could take to decrease the number of cases of acetaminophen-related liver injury. The working group considered detailed reviews of the issues from the Office of Nonprescription Products, the Office of Surveillance and Epidemiology and the Division of Anesthesia and Analgesic and Rheumatology Drug Products as part of its deliberations. The working group considered the full range of options proposed and made recommendations to the Center Director regarding which should be considered for implementation. Given the complex nature of the underlying problem of acetaminophen liver toxicity, the Center Director and the Working Group agreed that the options should be presented for public discussion prior to taking further action. The report of the Working Group will be available by or around May 22, 2009, at the 2009 Meeting Materials web page, click on the year 2009 and scroll down to the appropriate advisory committee link.
1. Kaufman, D.W., J.P. Kelly, L. Rosenberg, et al., ‘‘Recent Patterns of Medication Use in the Ambulatory Adult Population of the United States: The Slone Survey,’’ The Journal of the American Medical Association 2002, Jan 16;287(3) 337–44.
2. Larson, A.M., J. Polson, R.J. Fontana, et al., Acute Liver Failure Study Group (ALFSG), ‘‘Acetaminophen-Induced Acute Liver Failure: Results of a United States Multicenter, Prospective Study,’’ Hepatology 2005, Dec;42(6):1364–72.
3. Bower, W.A., M. Johns, H.S. Margolis, et al., ‘‘Population-Based Surveillance for Acute Liver Failure,’’ The American Journal of Gastroenterology 2007;102:2459–63.
4. Data from both FDA’s Adverse Event Reporting System (AERS) and the ALFSG show that the median daily dose of acetaminophen related to liver injury was 5 to 7.5 grams/day, very near the current maximum daily dose of 4 grams/day.
5. ‘‘APAP’’ is an acronym based on the chemical name of acetaminophen, N-acetyl-paraaminophenol.
6. Stumpf J.L., A.J. Skyles, C. Alaniz, et al., ‘‘Knowledge of Appropriate Acetaminophen Doses and Potential Toxicities in an Adult Clinic Population, Journal of the American Pharmacists Association (2003), 2007 Jan-Feb; 47(1): 35–41.
8. Letter from Steven Galson to State Boards of Pharmacy, Acetaminophen Hepatotoxicity and Nonsteroidal Anti-Inflammatory Drug (NSAID)-Related Gastrointestinal and Renal Toxicity (January 22, 2004), available on FDA’s Web site
9. Internal Analgesic, Antipyretic, and Antirheumatic Drug Products for Over-the Counter Human Use: Proposed Amendment of the Tentative Final Monograph: Required Warnings and Other Labeling, 71 FR 77314–52 (December 26, 2006) (Docket No.1977N–0094L) (amending 21 CFR 201.66, 201.322, 201.325, 343.50).
FDA intends to make the complete background material available to the public no later than 2 business days before the meeting. If FDA is unable to post the background material on its Web site prior to the meeting, the background material will be made publicly available at the location of the advisory committee meeting, and the background material will be posted on FDA’s Web site after the meeting.
Public Participation and Sponsor Information
Interested persons and Sponsors (representatives from industry) may present data, information, or views, orally or in writing, on issues pending before the committee.
Electronic and written submissions may be made to the Docket on or before June 8th 2009. Electronic comments should be submitted to the FDA. Enter ``FDA-2009-N-0138 Liver Injury Related to the Use of Acetaminophen and Vicodin Side Effects'' and follow the prompts to submit your statement. Written comments should be submitted to the Division of Dockets Management (HFA-305), Food and Drug Administration, 5630 Fishers Lane, rm. 1061, Rockville, MD 20852. All comments received will be posted without change, including any personal information provided. Comments received on or before June 8, 2009, will be provided to the committee before the meeting.
Oral presentations from the public (excluding Sponsors) will be scheduled between approximately 1 p.m. and 2 p.m on both days, June 29 and June 30, 2009. Those desiring to make formal oral presentations should notify the contact person and submit a brief statement of the general nature of the evidence or arguments they wish to present, the names and addresses of proposed participants, and an indication of the approximate time requested to make their presentation on or before June 1, 2009. Time allotted for each presentation may be limited. If the number of registrants requesting to speak is greater than can be reasonably accommodated during the scheduled open public hearing session, FDA may conduct a lottery to determine the speakers for the scheduled open public hearing session. The contact person will notify interested persons regarding their request to speak by June 3, 2009.
The FDA will work with sponsors of acetaminophen products such as Vicodin who wish to make presentations to ensure that adequate time, separate from the 1 p.m. to 2 p.m. time slots for the general Open Public Hearing, is provided. Sponsors interested in making formal presentations to the committees should notify the contact person on or before June 1, 2009. Sponsors with common interest are urged to coordinate their oral presentations.