Common Propecia Side Effects


The most commonly reported Propecia side effects (click to view or check a box to report):

Erectile Dysfunction (454)
Sexual Dysfunction (267)
Depression (215)
Libido Decreased (188)
Anxiety (186)
Cognitive Disorder (162)
Loss Of Libido (134)
Testicular Pain (64)
Fatigue (62)
Hepatic Function Abnormal (57)
Semen Volume Decreased (51)
Blood Testosterone Decreased (45)
Insomnia (45)
Ejaculation Disorder (45)
Feeling Abnormal (44)
Disturbance In Attention (41)
Gynaecomastia (41)
Alopecia (40)
Memory Impairment (40)
Penis Disorder (38)

➢ More



If you or someone in your family has experienced a serious side effect to a health product, you are encouraged to report the experience to your health care professional (e.g. physician, pharmacist). You could also complete a copy of the side effect reporting form or report your side effect to FDA.

Propecia Side Effects Reported to FDA



Propecia Side Effect Report#9970764
Quality Of Life Decreased, Male Sexual Dysfunction, Depression, Fatigue
This is a report of a 27-year-old male patient (weight: NA) from US, suffering from the following health symptoms/conditions: NA, who was treated with Propecia (dosage: NA, start time:
Mar 02, 2014), combined with: NA. and developed a serious reaction and side effect(s): Quality Of Life Decreased, Male Sexual Dysfunction, Depression, Fatigue after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Propecia treatment in male patients, resulting in Quality Of Life Decreased side effect.
Propecia Side Effect Report#9935254
Adverse Event, Hair Disorder
This report suggests a potential Propecia Adverse Event side effect(s) that can have serious consequences. A 22-year-old patient (weight: NA) from US was diagnosed with the following symptoms/conditions: NA and used Propecia (dosage: NA) starting NS. After starting Propecia the patient began experiencing various side effects, including: Adverse Event, Hair DisorderAdditional drugs used concurrently: NA. Although Propecia demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Adverse Event, may still occur.
Propecia Side Effect Report#9925138
Lipodystrophy Acquired, Libido Decreased, Erectile Dysfunction, Penile Size Reduced, Anhedonia, Blood Luteinising Hormone Decreased, Blood Follicle Stimulating Hormone Decreased, Blood Testosterone Decreased
This Lipodystrophy Acquired problem was reported by a consumer or non-health professional from US. A 32-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: alopecia. On
Mar 20, 2011 this consumer started treatment with Propecia (dosage: 1 Pill). The following drugs were being taken at the same time: NA. When using Propecia, the patient experienced the following unwanted symptoms/side effects: Lipodystrophy Acquired, Libido Decreased, Erectile Dysfunction, Penile Size Reduced, Anhedonia, Blood Luteinising Hormone Decreased, Blood Follicle Stimulating Hormone Decreased, Blood Testosterone DecreasedAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Lipodystrophy Acquired, may become evident only after a product is in use by the general population.
Propecia Side Effect Report#9912701
Peyronie^s Disease, Sexual Dysfunction
This Peyronie^s Disease side effect was reported by a physician from US. A 61-year-old male patient (weight:NA) experienced the following symptoms/conditions: prophylaxis,alopecia.The patient was prescribed Propecia (drug dosage: 1mg Taken By Mouth), which was initiated on NS. Concurrently used drugs: NA..After starting to take Propecia the consumer reported adverse symptoms, such as: Peyronie^s Disease, Sexual DysfunctionThese side effects may potentially be related to Propecia.
Propecia Side Effect Report#9910113
Sexual Dysfunction, Orgasm Abnormal
This is a report of a 46-year-old male patient (weight: NA) from US, suffering from the following health symptoms/conditions: androgenetic alopecia, who was treated with Propecia 1mg Merck (dosage: 1 Pill Once Daily Taken By Mouth, start time:
Feb 01, 2010), combined with: NA. and developed a serious reaction and side effect(s): Sexual Dysfunction, Orgasm Abnormal after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Propecia 1mg Merck treatment in male patients, resulting in Sexual Dysfunction side effect.
Propecia Side Effect Report#9867045
Orgasm Abnormal, Libido Decreased, Ejaculation Disorder, Erectile Dysfunction, Penis Disorder
This report suggests a potential Propecia Orgasm Abnormal side effect(s) that can have serious consequences. A 32-year-old male patient (weight: NA) from US was diagnosed with the following symptoms/conditions: alopecia and used Propecia (dosage: Taken By Mouth) starting
Jan 01, 2009. After starting Propecia the patient began experiencing various side effects, including: Orgasm Abnormal, Libido Decreased, Ejaculation Disorder, Erectile Dysfunction, Penis DisorderAdditional drugs used concurrently: NA. Although Propecia demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Orgasm Abnormal, may still occur.
Propecia Side Effect Report#9866879
Bladder Cancer, Male Sexual Dysfunction, Penile Size Reduced, Body Mass Index Decreased, Loss Of Libido, Cognitive Disorder, Mental Impairment
This Bladder Cancer problem was reported by a consumer or non-health professional from US. A 45-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: alopecia. On
Feb 16, 1999 this consumer started treatment with Propecia (dosage: Taken By Mouth). The following drugs were being taken at the same time: NA. When using Propecia, the patient experienced the following unwanted symptoms/side effects: Bladder Cancer, Male Sexual Dysfunction, Penile Size Reduced, Body Mass Index Decreased, Loss Of Libido, Cognitive Disorder, Mental ImpairmentAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Bladder Cancer, may become evident only after a product is in use by the general population.
Propecia Side Effect Report#9863951
Peyronie^s Disease, Arthritis, Apathy, Quality Of Life Decreased, Depression, Anxiety, Joint Instability, Muscular Weakness, Weight Increased
This Peyronie^s Disease side effect was reported by a consumer or non-health professional from US. A 25-year-old male patient (weight:NA) experienced the following symptoms/conditions: androgenetic alopecia.The patient was prescribed Propecia (drug dosage: 1 Mg, Qd), which was initiated on 201302. Concurrently used drugs: NA..After starting to take Propecia the consumer reported adverse symptoms, such as: Peyronie^s Disease, Arthritis, Apathy, Quality Of Life Decreased, Depression, Anxiety, Joint Instability, Muscular Weakness, Weight IncreasedThese side effects may potentially be related to Propecia.
Propecia Side Effect Report#9861328
Alopecia
This is a report of a 58-year-old male patient (weight: NA) from US, suffering from the following health symptoms/conditions: alopecia, who was treated with Propecia (dosage: 1 Mg, Qd, start time: 2004), combined with: NA. and developed a serious reaction and side effect(s): Alopecia after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Propecia treatment in male patients, resulting in Alopecia side effect.
Propecia Side Effect Report#9858327
Feeling Abnormal, Anxiety, Dizziness, Confusional State, Amnesia, Panic Attack, Sexual Dysfunction
This report suggests a potential Propecia Feeling Abnormal side effect(s) that can have serious consequences. A 31-year-old male patient (weight: NA) from US was diagnosed with the following symptoms/conditions: alopecia and used Propecia (dosage: Taken By Mouth) starting NS. After starting Propecia the patient began experiencing various side effects, including: Feeling Abnormal, Anxiety, Dizziness, Confusional State, Amnesia, Panic Attack, Sexual DysfunctionAdditional drugs used concurrently: NA.The patient was hospitalized and became disabled. Although Propecia demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Feeling Abnormal, may still occur.
Propecia Side Effect Report#9850824
Suicidal Ideation, Depression
This Suicidal Ideation problem was reported by a consumer or non-health professional from SG. A 19-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: androgenetic alopecia. On
Jun 01, 2013 this consumer started treatment with Propecia (dosage: 1 Mg, Qd). The following drugs were being taken at the same time: NA. When using Propecia, the patient experienced the following unwanted symptoms/side effects: Suicidal Ideation, DepressionAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Suicidal Ideation, may become evident only after a product is in use by the general population.
Propecia Side Effect Report#9848030
Erectile Dysfunction, Libido Decreased, Semen Analysis Abnormal
This Erectile Dysfunction side effect was reported by a consumer or non-health professional from US. A 28-year-old male patient (weight:NA) experienced the following symptoms/conditions: alopecia.The patient was prescribed Propecia (drug dosage: NA), which was initiated on NS. Concurrently used drugs: NA..After starting to take Propecia the consumer reported adverse symptoms, such as: Erectile Dysfunction, Libido Decreased, Semen Analysis AbnormalThese side effects may potentially be related to Propecia.
Propecia Side Effect Report#9844953
Cognitive Disorder, Activities Of Daily Living Impaired, Quality Of Life Decreased, Fatigue, Mental Impairment, Speech Disorder, Dysgraphia, Amnesia, Amnesia
This is a report of a 22-year-old male patient (weight: NA) from US, suffering from the following health symptoms/conditions: alopecia,prophylaxis, who was treated with Propecia (dosage: NA, start time:
Jul 01, 2002), combined with: NA. and developed a serious reaction and side effect(s): Cognitive Disorder, Activities Of Daily Living Impaired, Quality Of Life Decreased, Fatigue, Mental Impairment, Speech Disorder, Dysgraphia, Amnesia, Amnesia after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Propecia treatment in male patients, resulting in Cognitive Disorder side effect.
Propecia Side Effect Report#9842751
Pulmonary Embolism
This report suggests a potential Propecia 1 Mg Comprimidos Recubiertos Con Pel?cula Pulmonary Embolism side effect(s) that can have serious consequences. A 43-year-old male patient (weight: NA) from ES was diagnosed with the following symptoms/conditions: NA and used Propecia 1 Mg Comprimidos Recubiertos Con Pel?cula (dosage: NA) starting 1993. After starting Propecia 1 Mg Comprimidos Recubiertos Con Pel?cula the patient began experiencing various side effects, including: Pulmonary EmbolismAdditional drugs used concurrently: NA.The patient was hospitalized. Although Propecia 1 Mg Comprimidos Recubiertos Con Pel?cula demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Pulmonary Embolism, may still occur.
Propecia Side Effect Report#9834251
Cognitive Disorder, Sexual Dysfunction
This Cognitive Disorder problem was reported by a consumer or non-health professional from US. A 45-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: androgenetic alopecia. On 2010 this consumer started treatment with Propecia (dosage: Unk). The following drugs were being taken at the same time: NA. When using Propecia, the patient experienced the following unwanted symptoms/side effects: Cognitive Disorder, Sexual DysfunctionAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Cognitive Disorder, may become evident only after a product is in use by the general population.
Propecia Side Effect Report#9828528
Agitation, Apathy, Cognitive Disorder, Dependent Personality Disorder, Ejaculation Failure, Emotional Disorder, Erectile Dysfunction, Feeling Cold, Genital Hypoaesthesia
This Agitation side effect was reported by a consumer or non-health professional from CA. A 25-year-old male patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Propecia (drug dosage: 1 Mg, 1 Every 1 Day), which was initiated on NS. Concurrently used drugs: NA..After starting to take Propecia the consumer reported adverse symptoms, such as: Agitation, Apathy, Cognitive Disorder, Dependent Personality Disorder, Ejaculation Failure, Emotional Disorder, Erectile Dysfunction, Feeling Cold, Genital HypoaesthesiaThese side effects may potentially be related to Propecia.
Propecia Side Effect Report#9826238
Abortion Spontaneous, Exposure Via Father
This is a report of a 23-year-old female patient (weight: NA) from GB, suffering from the following health symptoms/conditions: alopecia,rheumatoid arthritis, who was treated with Propecia 1mg Film-coated Tablet (dosage: 1 Mg, Qd, start time: NS), combined with:
  • Sulfasalazine
and developed a serious reaction and side effect(s): Abortion Spontaneous, Exposure Via Father after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Propecia 1mg Film-coated Tablet treatment in female patients, resulting in Abortion Spontaneous side effect.
Propecia Side Effect Report#9813217
Suicidal Ideation
This report suggests a potential Propecia 1mg Film-coated Tablet Suicidal Ideation side effect(s) that can have serious consequences. A 33-year-old male patient (weight: NA) from GB was diagnosed with the following symptoms/conditions: alopecia and used Propecia 1mg Film-coated Tablet (dosage: 1 Mg, Unk) starting
Oct 05, 2010. After starting Propecia 1mg Film-coated Tablet the patient began experiencing various side effects, including: Suicidal IdeationAdditional drugs used concurrently: NA. Although Propecia 1mg Film-coated Tablet demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Suicidal Ideation, may still occur.
Propecia Side Effect Report#9804548
Cognitive Disorder, Sexual Dysfunction, Erectile Dysfunction, Dyslipidaemia, Wisdom Teeth Removal, Acarodermatitis
This Cognitive Disorder problem was reported by a physician from US. A male patient (weight: NA) was diagnosed with the following symptoms/conditions: alopecia. On
May 29, 2008 this consumer started treatment with Propecia (dosage: 1 Mg, Qd). The following drugs were being taken at the same time: NA. When using Propecia, the patient experienced the following unwanted symptoms/side effects: Cognitive Disorder, Sexual Dysfunction, Erectile Dysfunction, Dyslipidaemia, Wisdom Teeth Removal, AcarodermatitisAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Cognitive Disorder, may become evident only after a product is in use by the general population.
Propecia Side Effect Report#9804296
Orgasmic Sensation Decreased, Emotional Distress, Anxiety, Adenoma Benign, Deafness Neurosensory, Erectile Dysfunction, Tinnitus
This Orgasmic Sensation Decreased side effect was reported by a physician from US. A male patient (weight:NA) experienced the following symptoms/conditions: androgenetic alopecia.The patient was prescribed Propecia (drug dosage: 1 Mg, Qd), which was initiated on
Jul 28, 2010. Concurrently used drugs: NA..After starting to take Propecia the consumer reported adverse symptoms, such as: Orgasmic Sensation Decreased, Emotional Distress, Anxiety, Adenoma Benign, Deafness Neurosensory, Erectile Dysfunction, TinnitusThese side effects may potentially be related to Propecia.
Propecia Side Effect Report#9796894
Ejaculation Disorder
This is a report of a 44-year-old patient (weight: NA) from US, suffering from the following health symptoms/conditions: androgenetic alopecia, who was treated with Propecia (dosage: 1 Pill, start time: NS), combined with: NA. and developed a serious reaction and side effect(s): Ejaculation Disorder after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Propecia treatment in patients, resulting in Ejaculation Disorder side effect.
Propecia Side Effect Report#9787913
Sperm Concentration Decreased, Libido Decreased, Vision Blurred
This report suggests a potential Propecia 1mg Merck Sperm Concentration Decreased side effect(s) that can have serious consequences. A 31-year-old male patient (weight: NA) from US was diagnosed with the following symptoms/conditions: androgenetic alopecia and used Propecia 1mg Merck (dosage: 11-12 Years 1 Pill Once Daily) starting NS. After starting Propecia 1mg Merck the patient began experiencing various side effects, including: Sperm Concentration Decreased, Libido Decreased, Vision BlurredAdditional drugs used concurrently: NA. Although Propecia 1mg Merck demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Sperm Concentration Decreased, may still occur.
Propecia Side Effect Report#9777990
Acne, Discomfort
This Acne problem was reported by a pharmacist from GB. A 33-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: androgenetic alopecia. On
May 31, 2013 this consumer started treatment with Propecia 1mg Film-coated Tablet (dosage: 1 Mg, Qd). The following drugs were being taken at the same time: NA. When using Propecia 1mg Film-coated Tablet, the patient experienced the following unwanted symptoms/side effects: Acne, DiscomfortAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Acne, may become evident only after a product is in use by the general population.
Propecia Side Effect Report#9772129
Sexual Dysfunction, Mental Status Changes, Emotional Disorder, Endocrine Disorder, Anxiety, Disturbance In Attention, Depression, Cognitive Disorder
This Sexual Dysfunction side effect was reported by a consumer or non-health professional from US. A 20-year-old male patient (weight:NA) experienced the following symptoms/conditions: alopecia.The patient was prescribed Propecia (drug dosage: NA), which was initiated on
Jan 20, 2010. Concurrently used drugs: NA..After starting to take Propecia the consumer reported adverse symptoms, such as: Sexual Dysfunction, Mental Status Changes, Emotional Disorder, Endocrine Disorder, Anxiety, Disturbance In Attention, Depression, Cognitive DisorderThese side effects may potentially be related to Propecia.
Propecia Side Effect Report#9771898
Paraesthesia, Depression, Depressed Mood, Semen Volume Decreased
This is a report of a 34-year-old male patient (weight: NA) from GB, suffering from the following health symptoms/conditions: androgenetic alopecia, who was treated with Propecia 1mg Film-coated Tablet (dosage: 1 Mg, Qd, start time: 201301), combined with: NA. and developed a serious reaction and side effect(s): Paraesthesia, Depression, Depressed Mood, Semen Volume Decreased after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Propecia 1mg Film-coated Tablet treatment in male patients, resulting in Paraesthesia side effect.


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The appearance of Propecia on this list does not mean that FDA has concluded that the drug has the listed risk. It means that FDA has identified a potential safety issue, but it does not mean that FDA has found a causal relationship between the drug and the listed risk.

What are common Propecia Side Effects for Women?

Women Side Effects Reports
Abortion Spontaneous 14
Abortion Induced 11
Placental Insufficiency 3
Adverse Event 2
Caesarean Section 2
Exposure During Pregnancy 2
Exposure Via Father 2
Exposure Via Semen 2
Hospitalisation 2
Intra-uterine Death 2

What are common Propecia Side Effects for Men?

Men Side Effects Reports
Erectile Dysfunction 452
Sexual Dysfunction 266
Depression 211
Libido Decreased 186
Anxiety 183
Cognitive Disorder 162
Loss Of Libido 133
Testicular Pain 64
Fatigue 60
Hepatic Function Abnormal 57

Track Your Side Effects

Note Your Observations

It is really important to keep track of your health symptoms, right from the time you start a new medicine. You can do it any way you prefer: in a notebook, in a computer file or using our online tool. You should also note down any other medicines you are taking at the same time, because there could be an interaction between these medicines.

Why Your Notes are Important

Your notes could be helpful in several ways:

  • You can use them to remind you of details that may alert your health care professional(s) to a problem
  • You will have a record to refer to in the future, in case you are ever prescribed the same medicine again

  • Log Form

    You can use the following log form to write down important information, like the date and time you experienced a side effect and your symptoms, how strong the symptoms were, and any other medicines you were using.

    Medicine Name and Dosage:
    Side Effects Scale Date & Time Other Medicine(s) or Treatment(s)
    Scale: 1 = very mild to 10 = very bad

    Side effects reports are analyzed to discover potential health product safety signals. Some important reactions may take an extremely long time to develop or occur infrequently. Continued monitoring of adverse reactions is thus essential to maintain a comprehensive safety and effectiveness profile of health products.

    You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

    Propecia reports list potential signals of serious risks and new safety information that were identified using the FDA Adverse Event Reporting System (FAERS).
    FAERS is a database that contains information on adverse event and medication errors reports submitted to FDA by healthcare professionals (such as physicians, pharmacists, nurses and others), consumers (such as patients, family members, layers and others) and manufacturers.

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    Propecia Safety Alerts, Active Ingredients, Usage Information

    NDC 0006-0071
    Type HUMAN PRESCRIPTION DRUG
    Proprietary Name PROPECIA
    Name finasteride
    Dosage Form TABLET, FILM COATED
    Route ORAL
    On market since 19971219
    Labeler Merck Sharp & Dohme Corp.
    Active Ingredient(s) FINASTERIDE
    Strength(s) 1
    Unit(s) mg/1
    Pharma Class 5-alpha Reductase Inhibitor [EPC],5-alpha Reductase Inhibitors [MoA]

    Propecia Dosage, Warnings, Usage.

    Side Effects reported to FDA: 1592

    Propecia safety alerts: No

    Reported deaths: 13

    Reported hospitalizations: 313

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