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February 9, 2012

finasteride, Proscar

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GENERIC NAME: finasteride

BRAND NAME: Proscar

DRUG CLASS AND MECHANISM: The prostate gland is located around the tube which empties urine from the bladder (urethra). As the prostate gland enlarges, usually after 50 years of age, it can obstruct or partially block the urine flow. This leads to symptoms which include dribbling of urine, narrow stream, problems starting urine flow, interruption while urinating, and a feeling of incomplete emptying. Other symptoms include wetting and staining of clothes, urinary burning, and urgency.

Prostate gland enlargement (benign prostatic hyperplasia or BPH), is directly dependent on DHT (a hormone converted from the male hormone testosterone). Finasteride inhibits the enzyme necessary for the conversion of testosterone to DHT in the prostate. Therefore, administration of finasteride lowers blood and tissue DHT levels and helps reduce the size of the prostate gland.

Although reductions in the size of the prostate gland can occur in virtually all the patients who take finasteride, only 50% will experience improvement in the symptoms of BPH. Patients generally respond to finasteride in several weeks, but it often takes 6 months for the patient to receive the full effect of the drug.

PRESCRIPTION: yes

GENERIC AVAILABLE: yes

PREPARATIONS: Tablet (5mg).

STORAGE: Finasteride should be stored at room temperature in a tight light resistant container.

PRESCRIBED FOR: Finasteride is used to treat symptoms of BPH. Finasteride is approved for use with the alpha-blocker, doxazosin, to reduce the progression of symptoms of BPH.

DOSING: Finasteride is metabolized mainly by the liver, and caution should be used in patients with liver dysfunction. Finasteride may be taken with or without food.

DRUG INTERACTIONS: Drug interactions are generally not a problem.

PREGNANCY: Finasteride causes abnormal development of the sexual organs of the male fetus. Therefore, women who are pregnant or are likely to be pregnant should not handle crushed or broken finasteride tablets in order to prevent absorption through the skin.

NURSING MOTHERS: Finasteride is not prescribed for women.

SIDE EFFECTS: Side effects are rare but can include impotence and decreased sex drive. Finasteride should not be used by women, children, or male partners of women trying to become pregnant. Finasteride should not be used until a thorough prostate examination has been done to exclude cancer, stricture, or infection in the gland. Rarely, cases of male breast cancer have been reported.

Reference: FDA Prescribing Information


Last Editorial Review: 8/12/2011




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  • Related Diseases & Conditions

    • Prostatitis
      • Prostatitis is a painful condition of the prostate gland. There are four types of prostatitis, acute bacterial, chronic bacterial, chronic pelvic pain syndrome, and asymptomatic inflammatory prostatitis. Diagnosis is made with a digital rectal exam, urinalysis, ultrasound, MRI, biopsy, or blood test. Treatment depends upon the type of prostatitis.
    • Male Breast Cancer
      • Male breast cancer accounts for 1% of all breast cancers, and most cases are found in men between the ages of 60 and 70. A man's risk of developing breast cancer is one in 1,000. Signs and symptoms include a firm mass located below the nipple and skin changes around the nipple, including puckering, redness or scaling, retraction and ulceration of the nipple. Treatment depends upon staging and the health of the patient.
    • Benign Prostatic Hyperplasia
      • Benign prostatic hyperplasia (BPH or enlarged prostate) is very common in men over 50 years of age. This noncancerous enlargement of the prostate can impede urine flow, slow the flow of urine, create the urge to urinate frequently and cause other symptoms like complete blockage of urine and urinary tract infections. Treatment may involve watchful waiting, medication, or surgery.
    • Urinary Incontinence
      • There are many types of urinary incontinence (UI), which is the accidental leakage of urine. These types include stress incontinence, urge incontinence, and overflow incontinence. Urinary incontinence in men may be caused by prostate or nerve problems. Treatment depends upon the type and severity of the UI and the patient's lifestyle.
    • Urinary Retention
      • Urinary retention (inability to urinate) may be caused by nerve disease, spinal cord injury, prostate enlargement, infection, surgery, medication, bladder stone, constipation, cystocele, rectocele, or urethral stricture. Symptoms include discomfort and pain. Treatment depends upon the cause of urinary retention.
    • Men's Health
      • Men's health is an important component to a happy lifestyle and healthy relationships. Eating healthy, exercise, managing stress, and knowing when to have medical tests for a particular age is key to disease prevention in men.
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finasteride, Proscar

Urinary incontinence (UI) in men facts

*Urinary incontinence (UI) in men facts Medically Edited by: Melissa Conrad Stöppler, MD

  • The definition of urinary incontinence in men is the unintentional loss of urine. Weak bladder muscles, overactive bladder muscles, certain prostate conditions, and nerve damage are just some of the possible underlying causes of urinary incontinence in men.
  • There are different types of urinary incontinence in men, including stress incontinence, urge incontinence, and overflow incontinence.
  • Diagnosis of urinary incontinence in men may involve a physical exam, an ultrasound, urodynamic testing, and tests including an electroencephalogram (EEG) and an electromyogram (EMG). The doctor will also take a medical history and may recommend keeping a bladder diary.
  • Treatment of urinary incontinence in men may include behavioral treatments, like bladder training and Kegel exercises, medication, surgery, or...

Read the Urinary Incontinence article »






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