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Propecia Side Effects – Details of Possible Propecia Adverse Effects

Propecia (finasteride) is a drug licensed in the UK and USA for the treatment of hair loss; this means that it has been deemed safe and effective by the government medical regulatory bodies (MHRA and FDArespectively) following extensive clinical trials on more than 1,000 candidates. In clinical trials under 2% of Propecia users experienced mild side effects which included less desire for sex, difficulty in achieving an erection and a decrease in the amount of semen (for full list view leaflet below).

Alternatives to Propecia

For those who are not comfortable with using Propecia for hair loss, Belgravia offers medically proven alternatives to Propecia and hair growth boosters that have shown in many cases to offer parallel results for hair loss stabilisation and hair regrowth. More information on all treatments (including finasteride) can be found on our hair loss treatments page. Results from our hair loss treatment programmes can be viewed in our hair loss success stories gallery. Below is a transcript of the Propecia information leaflet, provided with each box of Propecia in the UK and including details of side effects.

More information on finasteride (Propecia) can be found on our finasteride page.

Propecia Patient Information Leaflet

Patient Information

PROPECIA (Pro-pee-sha)



PROPECIA®  is for use by MEN ONLY and should NOT be used by women or children.

Read this Patient Information before you start taking PROPECIA and each time you get a refill. There may be new information. This information does not take the place of talking with your healthcare provider about your medical condition or treatment.


PROPECIA is a prescription medicine used for the treatment of male pattern hair loss (androgenetic alopecia).

It is not known if PROPECIA works for a receding hairline on either side of and above your forehead (temporal area).

PROPECIA is not for use by women and children.

Who should not take PROPECIA?

Do not take PROPECIA if you:

  • are pregnant or may become pregnant. PROPECIA may harm your unborn baby.
    • PROPECIA tablets are coated and will prevent contact with the medicine during handling, as long as the tablets are not broken or crushed. Females who are pregnant or who may become pregnant should not come in contact with broken or crushed PROPECIA tablets.
    • If a pregnant woman comes in contact with crushed or broken PROPECIA tablets, wash the contact area right away with soap and water. If a woman who is pregnant comes into contact with the active ingredient in PROPECIA, a healthcare provider should be consulted.
    • If a woman who is pregnant with a male baby swallows or comes in contact with the medicine in PROPECIA, the male baby may be born with sex organs that are not normal.
  • are allergic to any of the ingredients in PROPECIA. See the end of this leaflet for a complete list of ingredients in PROPECIA.

What should I tell my healthcare provider before taking PROPECIA?

Before taking PROPECIA, tell your healthcare provider if you:

  • have any other medical conditions, including problems with your prostate or liver

Tell your healthcare provider about all the medicines you take, including prescription and nonprescription medicines, vitamins, and herbal supplements.

Know the medicines you take. Keep a list of them to show your healthcare provider and pharmacist when you get a new medicine.

How should I take PROPECIA?

  • Take PROPECIA exactly as your healthcare provider tells you to take it.
  • You may take PROPECIA with or without food.
  • If you forget to take PROPECIA, do not take an extra tablet. Just take the next tablet as usual.

PROPECIA will not work faster or better if you take it more than once a day.

What are the possible side effects of PROPECIA?

  • decrease in your blood Prostate Specific Antigen (PSA) levels. PROPECIA can affect a blood test called PSA (Prostate-Specific Antigen) for the screening of prostate cancer. If you have a PSA test done you should tell your healthcare provider that you are taking PROPECIA because PROPECIA decreases PSA levels. Changes in PSA levels will need to be evaluated by your healthcare provider. Any increase in follow-up PSA levels from their lowest point may signal the presence of prostate cancer and should be evaluated, even if the test results are still within the normal range for men not taking PROPECIA. You should also tell your healthcare provider if you have not been taking PROPECIA as prescribed because this may affect the PSA test results. For more information, talk to your healthcare provider.
  • There may be an increased risk of a more serious form of prostate cancer in men taking finasteride at 5 times the dose of PROPECIA.

The most common side effects of PROPECIA include:

  • decrease in sex drive
  • trouble getting or keeping an erection
  • a decrease in the amount of semen

The following have been reported in general use with PROPECIA:

  • breast tenderness and enlargement. Tell your healthcare provider about any changes in your breasts such as lumps, pain or nipple discharge.
  • depression;
  • decrease in sex drive that continued after stopping the medication;
  • allergic reactions including rash, itching, hives and swelling of the lips, tongue, throat, and face;
  • problems with ejaculation that continued after stopping medication;
  • testicular pain;
  • difficulty in achieving an erection that continued after stopping the medication;
  • male infertility and/or poor quality of semen.
  • in rare cases, male breast cancer.

Tell your healthcare provider if you have any side effect that bothers you or that does not go away.

These are not all the possible side effects of PROPECIA. For more information, ask your healthcare provider or pharmacist.

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

How should I store PROPECIA?

  • Store PROPECIA at room temperature between 59˚F to 86˚F (15˚C to 30˚C).
  • Keep PROPECIA in a closed container and keep PROPECIA tablets dry (protect from moisture).

Keep PROPECIA and all medicines out of the reach of children.

General information about the safe and effective use of PROPECIA.

Medicines are sometimes prescribed for purposes other than those listed in this Patient Information leaflet. Do not use PROPECIA for a condition for which it was not prescribed. Do not give PROPECIA to other people, even if they have the same symptoms you have. It may harm them.

This Patient Information leaflet summarizes the most important information about PROPECIA. If you would like more information, talk with your healthcare provider. You can ask your pharmacist or healthcare provider for information about PROPECIA that is written for health professionals. For more information, call 1-888-637-2522.

What are the ingredients in PROPECIA?

Active ingredient: finasteride.

Inactive ingredients: lactose monohydrate, microcrystalline cellulose, pregelatinized starch, sodium starch glycolate, hydroxypropyl methylcellulose, hydroxypropyl cellulose, titanium dioxide, magnesium stearate, talc, docusate sodium, yellow ferric oxide, and red ferric oxide.

This Patient Information has been approved by the U.S. Food and Drug Administration.

For patent information: www.merck.com/product/patent/home.html

Copyright © 1997 Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc.

All rights reserved.

Revised: 09/2013


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