Propecia Side Effects Center

Last updated on RxList: 8/11/2022
Propecia Side Effects Center

Medical Editor: John P. Cunha, DO, FACOEP

What Is Propecia?

Propecia (finasteride) is a 5a-reductase inhibitor indicated for the treatment of male pattern hair loss (androgenetic alopecia) in men only. Propecia is available in generic form.

What Are Side Effects of Propecia?

Side effects of Propecia include:

The sexual side effects of Propecia may continue after you stop taking it. Talk to your doctor if you have concerns about these side effects. Propecia may also cause decrease in blood prostate specific antigen (PSA) levels, and can affect the PSA blood test.

Propecia may cause serious side effects including:

Get medical help right away, if you have any of the symptoms listed above.

Seek medical care or call 911 at once if you have the following serious side effects:

  • Serious eye symptoms such as sudden vision loss, blurred vision, tunnel vision, eye pain or swelling, or seeing halos around lights;
  • Serious heart symptoms such as fast, irregular, or pounding heartbeats; fluttering in your chest; shortness of breath; and sudden dizziness, lightheartedness, or passing out;
  • Severe headache, confusion, slurred speech, arm or leg weakness, trouble walking, loss of coordination, feeling unsteady, very stiff muscles, high fever, profuse sweating, or tremors.

This document does not contain all possible side effects and others may occur. Check with your physician for additional information about side effects.

Dosage for Propecia

Propecia is available in strength of 1 mg tablets; the recommended dose of Propecia is one tablet (1mg) taken once daily. In general daily use for three months is necessary before benefit is observed. Withdrawl of treatment leads to reversal of effect within 12 months.

What Drugs, Substances, or Supplements Interact with Propecia?

Propecia may interact with other drugs. Tell your doctor all medications and supplements you use.

Propecia During Pregnancy and Breastfeeding

Propecia is not indicated for use in women. Women should not handle crushed or broken Propecia tablets when they are pregnant or may potentially be pregnant. Caution should be used in older men who have benign prostatic hyperplasia (BPH), PSA levels are decreased by approximately 50%. Men aged 55 and over have increased risk of high grade prostate cancer with 5a-reductase inhibitors. Caution should be exercised in administration of Propecia in those patients with liver function abnormalities. Propecia is not indicated for use in pediatric patients.

Additional Information

Our Propecia (finasteride) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

QUESTION

It is normal to lose 100-150 hairs per day. See Answer
Propecia Consumer Information

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Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you notice any signs of male breast cancer, such as:

  • breast pain or lumps;
  • nipple discharge; or
  • any other breast changes.

Tell your doctor right away if you have:

  • blood in your semen;
  • pain in your testicles; or
  • depression.

It may be harder for you to get a woman pregnant while you are using finasteride.

Common side effects may include:

  • decreased interest in sex;
  • trouble getting or keeping an erection;
  • trouble having an orgasm;
  • abnormal ejaculation; or
  • breast swelling or tenderness.

The sexual side effects of finasteride may continue after you stop taking this medicine. Talk to your doctor if you have concerns about these side effects.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Read the entire detailed patient monograph for Propecia (Finasteride)

SLIDESHOW

Your Hair and Scalp Can Say a Lot About Your Health See Slideshow
Propecia Professional Information

SIDE EFFECTS

Clinical Trials Experience

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in clinical practice.

Clinical Studies For PROPECIA (finasteride 1 mg) In The Treatment Of Male Pattern Hair Loss

In three controlled clinical trials for PROPECIA of 12-month duration, 1.4% of patients taking PROPECIA (n=945) were discontinued due to adverse experiences that were considered to be possibly, probably or definitely drug-related (1.6% for placebo; n=934).

Clinical adverse experiences that were reported as possibly, probably or definitely drugrelated in ≥1% of patients treated with PROPECIA or placebo are presented in Table 1.

TABLE 1: Drug-Related Adverse Experiences for PROPECIA (finasteride 1 mg) in Year 1 (%) MALE PATTERN HAIR LOSS

PROPECIA
N=945
Placebo
N=934
Decreased Libido 1.8 1.3
Erectile Dysfunction 1.3 0.7
Ejaculation Disorder 1.2 0.7
(Decreased Volume of Ejaculate) (0.8) (0.4)
Discontinuation due to drug-related sexual 1.2 0.9

Integrated analysis of clinical adverse experiences showed that during treatment with PROPECIA, 36 (3.8%) of 945 men had reported one or more of these adverse experiences as compared to 20 (2.1%) of 934 men treated with placebo (p=0.04). Resolution occurred in men who discontinued therapy with PROPECIA due to these side effects and in most of those who continued therapy. The incidence of each of the above adverse experiences decreased to ≤0.3% by the fifth year of treatment with PROPECIA.

In a study of finasteride 1 mg daily in healthy men, a median decrease in ejaculate volume of 0.3 mL (-11%) compared with 0.2 mL (-8%) for placebo was observed after 48 weeks of treatment. Two other studies showed that finasteride at 5 times the dosage of PROPECIA (5 mg daily) produced significant median decreases of approximately 0.5 mL (-25%) compared to placebo in ejaculate volume, but this was reversible after discontinuation of treatment.

In the clinical studies with PROPECIA, the incidences for breast tenderness and enlargement, hypersensitivity reactions, and testicular pain in finasteride-treated patients were not different from those in patients treated with placebo.

Controlled Clinical Trials and Long-Term Open Extension Studies for PROSCAR® (finasteride 5 mg) and AVODART (dutasteride) in the Treatment of Benign Prostatic Hyperplasia

In the PROSCAR Long-Term Efficacy and Safety Study (PLESS), a 4-year controlled clinical study, 3040 patients between the ages of 45 and 78 with symptomatic BPH and an enlarged prostate were evaluated for safety over a period of 4 years (1524 on PROSCAR 5 mg/day and 1516 on placebo). 3.7% (57 patients) treated with PROSCAR 5 mg and 2.1% (32 patients) treated with placebo discontinued therapy as a result of adverse reactions related to sexual function, which are the most frequently reported adverse reactions.

Table 2 presents the only clinical adverse reactions considered possibly, probably or definitely drug related by the investigator, for which the incidence on PROSCAR was ≥1% and greater than placebo over the 4 years of the study. In years 2-4 of the study, there was no significant difference between treatment groups in the incidences of impotence, decreased libido and ejaculation disorder.

TABLE 2: Drug-Related Adverse Experiences for PROSCAR (finasteride 5 mg) BENIGN PROSTATIC HYPERPLASIA

Year 1 (%) Years 2, 3 and 4* (%)
Finasteride 5 mg Placebo Finasteride 5 mg Placebo
Impotence 8.1 3.7 5.1 5.1
Decreased Libido 6.4 3.4 2.6 2.6
Decreased Volume of Ejaculate 3.7 0.8 1.5 0.5
Ejaculation Disorder 0.8 0.1 0.2 0.1
Breast Enlargement 0.5 0.1 1.8 1.1
Breast Tenderness 0.4 0.1 0.7 0.3
Rash 0.5 0.2 0.5 0.1
N = 1524 and 1516, finasteride vs placebo, respectively
*Rash 0.5 0.2 0.5 0.1

The adverse experience profiles in the 1-year, placebo-controlled, Phase III BPH studies and the 5-year open extensions with PROSCAR 5 mg and PLESS were similar.

There is no evidence of increased sexual adverse experiences with increased duration of treatment with PROSCAR 5 mg. New reports of drug-related sexual adverse experiences decreased with duration of therapy.

During the 4- to 6-year placebo- and comparator-controlled Medical Therapy of Prostatic Symptoms (MTOPS) study that enrolled 3047 men, there were 4 cases of breast cancer in men treated with PROSCAR but no cases in men not treated with PROSCAR. During the 4-year placebo-controlled PLESS study that enrolled 3040 men, there were 2 cases of breast cancer in placebo-treated men, but no cases were reported in men treated with PROSCAR.

During the 7-year placebo-controlled Prostate Cancer Prevention Trial (PCPT) that enrolled 18,882 men, there was 1 case of breast cancer in men treated with PROSCAR, and 1 case of breast cancer in men treated with placebo. The relationship between longterm use of finasteride and male breast neoplasia is currently unknown.

The PCPT trial was a 7-year randomized, double-blind, placebo-controlled trial that enrolled 18,882 healthy men ≥55 years of age with a normal digital rectal examination and a PSA ≤3.0 ng/mL. Men received either PROSCAR (finasteride 5 mg) or placebo daily. Patients were evaluated annually with PSA and digital rectal exams. Biopsies were performed for elevated PSA, an abnormal digital rectal exam, or the end of study. The incidence of Gleason score 8-10 prostate cancer was higher in men treated with finasteride (1.8%) than in those treated with placebo (1.1%). In a 4-year placebocontrolled clinical trial with another 5α-reductase inhibitor [AVODART (dutasteride)], similar results for Gleason score 8-10 prostate cancer were observed (1% dutasteride vs 0.5% placebo). The clinical significance of these findings with respect to use of PROPECIA by men is unknown.

No clinical benefit has been demonstrated in patients with prostate cancer treated with PROSCAR. PROSCAR is not approved to reduce the risk of developing prostate cancer.

Postmarketing Experience

The following adverse reactions have been identified during post approval use of PROPECIA. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure:

Hypersensitivity Reaction: hypersensitivity reactions such as rash, pruritus, urticaria, and angioedema (including swelling of the lips, tongue, throat, and face);

Reproductive System: sexual dysfunction that continued after discontinuation of treatment, including erectile dysfunction, libido disorders, ejaculation disorders, and orgasm disorders; male infertility and/or poor seminal quality (normalization or improvement of seminal quality has been reported after discontinuation of finasteride); testicular pain; hematospermia.

Neoplasms: male breast cancer;

Breast disorders: breast tenderness and enlargement;

Nervous System/Psychiatric: depression

DRUG INTERACTIONS

Cytochrome P450-Linked Drug Metabolizing Enzyme System

No drug interactions of clinical importance have been identified. Finasteride does not appear to affect the cytochrome P450-linked drug-metabolizing enzyme system. Compounds that have been tested in man include antipyrine, digoxin, propranolol, theophylline, and warfarin and no clinically meaningful interactions were found.

Other Concomitant Therapy

Although specific interaction studies were not performed, finasteride doses of 1 mg or more were concomitantly used in clinical studies with acetaminophen, acetylsalicylic acid, α-blockers, analgesics, angiotensin-converting enzyme (ACE) inhibitors, anticonvulsants, benzodiazepines, beta blockers, calcium-channel blockers, cardiac nitrates, diuretics, H2 antagonists, HMG-CoA reductase inhibitors, prostaglandin synthetase inhibitors (also referred to as NSAIDs), and quinolone anti-infectives without evidence of clinically significant adverse interactions.

Read the entire FDA prescribing information for Propecia (Finasteride)

© Propecia Patient Information is supplied by Cerner Multum, Inc. and Propecia Consumer information is supplied by First Databank, Inc., used under license and subject to their respective copyrights.

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