Been using Propecia for 11 months without noticing side effects. Will I notice the side effects later in life?

I've been using Propecia for 11 months without noticing the sexual side effects. However for the last couple of days I've been worrying about the potential side effects I've been reading about. Read that Propecia can cause male breast cancer (my aunt had breastcancer, my two uncles also had cancer). How big is the chance that I will notice the side effects later in life if I continue? To be safe that anything is not wrong I'm taking a general health checkup next week at a doctor's office.

Doctor Answers 4

In general most people notice side effects after the first few weeks after starting a medication.

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In general most people notice side effects after the first few weeks after starting a medication.  It does not mean you will not notice side effects months to years after.  There is no rule.


Los Angeles Hair Restoration Surgeon
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Been using Propecia for 11 months without noticing side effects. Will I notice the side effects later in life?

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There is no reliable evidence that finasteride causes male breast cancer however there is some increased risk of high grade prostate cancer in certain individuals. If you are on finasteride you should have a general health check up yearly. Report any symptoms or questions you may have had during the year. Some doctors advise that if you are on finasteride and need to check the PSA level to see where the number is in reference to a possibility of prostate cancer, the number needs to be doubled. In other words if your number is 1.2, and you are taking finasteride, then the number would be 2.4. Finsteride lowers actual prostate numbers.

William Woessner, MD
New Orleans Hair Restoration Surgeon
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Propecia and Side Effects

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I have been using propecia for 7 years without side effects.  The length of time using a medication doesn't increase the risk of side effects.  Best, Dr. Emer.

Jason Emer, MD
Los Angeles Dermatologic Surgeon
4.8 out of 5 stars 207 reviews

No side effects from Propecia at 11 months

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ALLanhossain,That is the typical course, most patients I treated have no side effects. From the 5 yr study data showed:With regard to the safety of Propecia, in the phase III trial the number of patients in the finesteride 1 mg F(#945) and placebo P(#934), the incidence of decreased libido F (#17/1.8%) whereas P(#12/1.3%). With regards erectile dysfunction F(#12/1.3%) and P(#7/.7%). With regards ejaculatory dysfunction F(#11/1.2%) and P (#7/.7%). The incidence of decreased ejaculatory volume F(#8/.8%) and P(#4/.4%).The total sexually related side effects F(#36/3.8%) and P(20/2.1%). The number of patients that discontinued participation in the study F(#11/1.2%) and P(#8/.9%). Hope this helps.
Sincerely,
Bernardino A. Arocha, MD  

These answers are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.