I've been on Finasteride for 26 months, but have recently been feeling off. Possible side effect?

The most commonly reported side effect of Finasteride is sexual dysfunction -this occurs in roughly 1-2% of users.I have had some patients complain of mood changes and other cognitive alterations but it is difficult to definitively conclude that this is due to Finasteride.I would recommend an evaluation by your physician .

It is not common but certainly possible. The chance of developing some side effects fo increase over time. See your presribing physician to sort out the presence or abscence of a link. 

 It's possible but pretty unlikely. A general fogginess has happened before to a very very very small set of patients but it always set in within a month or two or starting Finasteride, never after 16 months like you're describing. I would talk to your doctor about what else (if anything) could be causing your symptoms before stopping Finasteride and risking the progress you've made with it. Good luck!

Thank you for your question. After 16 months it is unlikely the effects you are describing will be attributed to finasteride. I would begin by having your eyes checked as the symptoms you describe can sometimes be related to diminishing visual acuity. Stress can also result in similar symptoms. You could certainly talk to your physician about coming off the finasteride for several months to see if your symptoms resolve but I would first look for other possible factors causing your symptoms.
I hope this was helpful - Dr. Moore

It is unlikely that what you are experiencing is due to Finasteride. I have been on this medication for 15 year, and give a thousand scripts per year of it out. Side effect occur in 1% of patients. Visit your doctor, if he is concerned, he can take you off for a month or so to see if the symptoms resolve or find another cause for them,Dr. Robert Jones