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Propecia Lawsuits

More than 1,000 men have filed lawsuits that accuse Merck & Co. Inc. of failing to adequately warn consumers and members of the medical community that the hair-loss drug Propecia may cause long-term sexual dysfunction problems that continue long after men stop taking the drug.

Propecia Pills
Propecia Lawsuit Facts
  1. Plaintiff Injuries Erectile dysfunction, ejaculation disorders, decreased libido, orgasm disorders, male infertility, poor semen quality, male breast cancer, testicular cancer, prostate cancer and cognitive problems
  2. Number of Lawsuits More than 1,300 in state and federal court
  3. Litigation Status 461 lawsuits pending in federal MDL as of August 2018
  4. Defendants Merck & Co.
  5. MDL Location Eastern District of New York
  6. Bellwether Trial Date September 2017

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For more than a decade, Merck & Co. Inc. maintained that any sexual dysfunctions associated with Propecia were rare and that the problems typically went away after men stopped taking the drug. Even after scores of men reported experiencing persistent sexual side effects following Propecia use, the manufacturer continued to publicize information in the U.S. that suggested side effects were temporary.

Meanwhile, regulators in Sweden had started investigating claims of sexual dysfunction from Propecia as far back as 2006. And in 2008, Merck added warnings to Swedish labels about persistent erectile dysfunction after discontinuing use. Still, it wasn’t until April 2012 — when the U.S. Food and Drug Administration (FDA) stepped in — that Merck updated Propecia labels in the U.S. to include warnings about “libido disorders, ejaculation disorders and orgasm disorders that continued after discontinuation of the drug.”

Merck added warnings about sexual dysfunction to Swedish labels in 2008, but labels in the U.S. weren’t updated until 2012.

By the time the FDA made Merck take action in the U.S., many men had already filed lawsuits across the country alleging injuries caused by Propecia. In April 2012, the U.S. Judicial Panel on Multidistrict Litigation consolidated federal Propecia lawsuits into a multidistrict litigation (MDL) in the Eastern District of New York.

MDLs are intended to make proceedings more efficient by centralizing federal lawsuits that have the same allegations into one court. All of the Propecia lawsuits make similar claims that Merck failed to adequately warn of the potential for Propecia to cause persistent sexual problems that continue after discontinuation of treatment.

Side effects named in Propecia lawsuits include*:
  • Erectile dysfunction
  • Decreased libido
  • Reduced ejaculation volume
  • Cognition impairment
  • Diminished sexual sensation
  • Genital shrinkage
  • Infertility
  • Depression

*Some also allege that Propecia has caused or can cause prostate cancer, testicular cancer or male breast cancer

Men also filed Propecia lawsuits in state court in New Jersey, where Merck is headquartered. The New Jersey Supreme Court decided to centrally manage Propecia lawsuits. In March 2012, the court assigned Middlesex County Superior Court Judge Jessica Mayer to oversee the cases. As of February 2013, her docket had more than 250 Propecia lawsuits pending. In addition, men filed lawsuits in state court in Massachusetts and New York.

Status of Propecia Lawsuits

To date, men have filed more than 1,300 Propecia lawsuits in state and federal courts. As of August 2018, there were 461 lawsuits pending in the federal MDL.

Federal Courthouse Brooklyn
Nearly 1,170 Propecia lawsuits were filed under the federal MDL in the Eastern District of New York, pictured above

Judge Brian M. Cogan is overseeing the MDL proceedings, collectively known as MDL -2331 IN RE: Propecia (Finasteride) Products Liability Litigation. Originally, the first cases were expected to go to trial beginning in October 2016; however, the court pushed back the date about a year to September 2017 because of a delay in selecting which cases would go to trial.

Of the 325 cases filed in New Jersey state court between June 2011 and November 2016, about 200 cases had been dismissed as of May 31, 2017. On July 24, 2017, the Propecia MDL was reassigned to Superior Court Judge James Hyland.

Propecia Lawsuit Claims

According to legal complaints, sexual dysfunction is associated with finasteride (the active ingredient in Propecia) as much as 39 percent of the time. Plaintiffs also point to 2003 data showing that sexual dysfunction is resolved in only 50 percent of patients who discontinue Propecia use.

People who have filed lawsuits allege that the drug is a “defective” and “unreasonably dangerous drug.” They allege that, “when taken as prescribed and intended, [Propecia] causes and contributes to an increased risk of persistent and/or permanent serious and dangerous side effects.”

Propecia lawsuits claim Merck:
  • Failed to take “reasonable care” in designing, testing, manufacturing and selling Propecia.
  • Knew or should have known that Propecia increases the risk of persistent and permanent side effects, even after consumers discontinue use.
  • Failed to provide adequate warnings and even “knowingly and recklessly omitted and concealed” known risks from consumers and doctors.
  • Inadequately labeled the drug prior to April 2011 by failing to disclose sexual dysfunction risks.
  • Knew that the scientific community and the public would rely on the drug labels and “the presumption that the dangers did not exist,” yet marketed the drug without adequate warnings.

Why People File Propecia Lawsuits

Harm caused by Propecia may be irreversible and even deadly. Men who have been injured and people who have lost loved ones in connection with dangerous drugs are left to pick up the pieces when drug makers act irresponsibly. Coping with adverse side effects can place a burden on relationships, limit daily activities, impair ability to work and jeopardize financial stability.

When available, plaintiffs also seek punitive damages to deter future misconduct by drug makers. In addition, loved ones may be eligible for compensation for their pain and suffering and other expenses, such as funeral expenses, if their loved one has died.

Below are just a few examples of people who have sued Merck over its drug Propecia.

Many people have filed lawsuits seeking relief, including compensation for:
  • Past and future medical expenses
  • Home health care
  • Permanent disability
  • Pain and suffering
  • Lost income

A Brooklyn, New York, man filed a complaint against Merck & Co., Inc. and its subsidiary, Merck Sharpe & Dohme Corp., in the U.S. District Court for the Eastern District of New York on May 15, 2012. After taking the prescription drug for hair loss, the man developed sexual dysfunction and cognitive impairment, according to court documents. He had no history of these conditions when he began taking Propecia in 1998 at age 33. Although he discontinued use of Propecia, the man continues to suffer these and other adverse effects. His lawsuit seeks damages for substantial pain and suffering and a diminished quality of life.

A King County, Washington, man filed a lawsuit in the U.S. District Court for the District of Washington in July 2011. His case was transferred to the MDL in April 2012. The man had no history of sexual dysfunction or cognitive impairment before he started taking Propecia for hair loss in 2008 at age 30, according to court documents. He has since developed those conditions and continues to suffer from them even though he has stopped taking Propecia.

An Illinois couple sued Merck in federal court in Illinois in November 2011. Their case was also transferred to the federal MDL. In addition to the husband’s claims of sexual dysfunction and cognitive impairment caused by Propecia, the lawsuit also includes his wife’s loss of consortium claim. She alleges that because of the injuries caused by Propecia, she has lost her husband’s companionship and other contributions to their household and relationship. She has suffered mental and emotional anguish due to the damage Propecia has caused to their marriage, according to the lawsuit.

Please seek the advice of a medical professional before making health care decisions.

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17 Cited Research Articles

  1. United States Securities and Exchange Commission. (2016, September 30). Quarterly Report Pursuant to Section 13 or 15(D) of the Securities Exchange Act of 1934. Retrieved from
  2. New Jersey Courts. (n.d.). Propecia. Retrieved from
  3. United States District Court Eastern District of New York. (2015, September 25). Discovery & Trial Plan. Retrieved from
  4. Wosinska, M., and Moon, Y.E. (2006, July). PROPECIA TM: Helping Make Hair Loss History. Harvard Business School Case 505-035. (Revised from original August 2004 version.) Retrieved from
  5. Silverthorne, S. (2004, November 22). Side Effects: The Case of Propecia. Harvard Business School. Retrieved from
  6. Merck Sharpe & Dohme Corp. (2012, December). Propecia.
  7. Irwig, M. S. and Kolukula, S. (2011), Persistent Sexual Side Effects of Finasteride for Male Pattern Hair Loss. Journal of Sexual Medicine, 8: 17471753. doi: 10.1111/j.1743-6109.2011.02255.x, cited at
  8. Fulmer, B. (2012, March 30). Zoloft and Propecia: New Coordinated Litigation on the Horizon? The Legal Examiner. Retrieved from
  9. In Re: Propecia (finasteride) Product Liability Litigation MDL No. 2331 (Transfer order). (2012, April 16).
  10. U.S. Judicial Panel on Multidistrict Litigation. (2013, January 14). MDL Statistics Report. Retrieved from
  11. State of New Jersey. (2013, February 12). Propecia Caselist. Retrieved from
  12. U.S. Food and Drug Administration. (2012, April 11). Questions and Answers: Finasteride Label Changes.
  13. U.S. Food and Drug Administration. (2011, August 9). Propecia (finasteride).
  14. Vivinetto v. Merck & Co., Inc., No. 1:2012cv02432 (filed May 15, 2012 E.D.N.Y).
  15. Shute v. Merck & Co., Inc., No. 2:2011cv01096 (transferred April 16, 2012 E.D.N.Y.).
  16. Menella v. Merck & Co., Inc., No. 1:2011cv07914 (transferred April 16, 2012 E.D.N.Y.).
  17. U.S. Judicial Panel on Multidistrict Litigation. (2018, August 15). MDL Statistics Report - Distribution of Pending MDL Dockets by District. Retrieved from
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