Side Effects of Propecia May Be Permanent

Please note that the lawyers at Saiontz & Kirk, P.A. are no longer taking on new cases involving Propecia. The content on this page is provided for informational purposes only.

The lawyers at Saiontz & Kirk, P.A. were previously reviewing potential Propecia cases for men who have experienced sexual dysfunction that may have been caused by side effects of the popular hair loss used by men throughout the United States.

Although it appears that Merck, the manufacturer of the drug, has been aware for some time about the potential risk of sexual dysfunction from side effects of Propecia, they failed to adequately warn consumers or the medical community about the extent of problems like:

  • Erectile Dysfunction
  • Infertility
  • Impotence
  • Decreased Libido
  • Other Sexual Side Effects

Men may be entitled to compensation through a Propecia sexual dysfunction lawsuit for these serious side effects, which can be permanent.

New cases are no longer being accepted by Saiontz & Kirk, P.A. This page is maintained for informational purposes only.


Propecia is a prescription medication sold by Merck that contains 1 mg of finasteride, which is a type II 5-Alpha reductase inhibitor that prevents the conversion of androgen testosterone to DHT in the scalp. Use of the medication may lead to a reduction of hair loss in men, reversing the healthy and normal occurrence of male pattern hair loss.

Although Merck knew or should have known that side effects of Propecia increase the risk of irreversible erectile dysfunction, infertility and other sexual dysfunction, they provided misleading and inadequate warnings in the United States.

Propecia warnings misleadingly indicate that less than 2% of men experienced certain sexual side effects from the hair-loss drug, such as less desire for sex, difficulty achieving an erection and a decrease in the amount of semen. They also falsely indicated that these sexual side effects of Propecia went away in men who stopped taking the drug because of them.

Due to a growing number of reports involving Propecia and erectile dyfunction, impotence and other sexual health problems, new warnings have been added in several European countries that indicate that the sexual dysfunction side effects may be permanent. However, warnings in the United States continued to provide deceptive information that failed to advise potential users about the large number of reports involving persistent and permanent sexual side effects.

In 2008, Meck changed the Propecia warnings in Sweden to indicate that post-marketing reports suggested persistent erectile dysfunction after Propecia use and the Swedish Medical Products Agency concluded in 2009 that there was a risk of permanent erectile dysfunction from Propecia.

Similar warnings about the risk of Propecia irreversible side effects were added in other countries, such as the United Kingdom and Italy. However, Merck continued to place their desire for profits before patient safety by failing to provide adequate warnings about the Propecia dangers in the United States.

Research has suggested that only about half of men who experienced sexual side effects from Propecia have the problems resolve after they stop the medication. Other studies have found that the mean duration of sexual dysfunction from Propecia was 40 months, with 20% of subjects reporting durations over 6 years.


The Propecia attorneys at Saiontz & Kirk, P.A. are reviewing potential claims for men throughout the United States who took this medication and suffered erectile dysfunction, impotence, infertility or other sexual side effects that persisted after use of the medication was stopped.

Although male pattern hair loss is an undesirable condition for many men, it is not an illness or disease. If accurate information about the potentially irreversible Propecia risks had been provided, many men would have elected not to use the prescription medication.

Merck spent millions of dollars on direct-to-consumer advertisements urging men with hair loss to talk to their doctors about the medication, while providing inadequate and misleading information about the risk of potentially permanent Propecia side effects.

New cases are no longer being accepted by Saiontz & Kirk, P.A. This page is maintained for informational purposes only.