23 year old male using finasteride for almost 2-3 weeks now. Can I use Cialis to improve my sexual functions?

I’m not a great fan of treating side effects with medications that bring on board the potential for other side effects. In my mind, if side effects occur, the body is telling the patient the medication dose and use needs to be revisited. If male patients have erectile dysfunction, I usually recommend reducing the dose slightly to see if that helps. Switching from oral to topical 5 alpha reductase inhibitors is also an option. 

The first question I would ask is whether the Doctor who prescribed you finasteride did blood work before doing so?  The fact that you are even experiencing these side effects would indicate not.It is important to always do blood work before prescribing any kind of medicine that impacts your hormones to understand what your body will do with it and how it will react to it.  Your doctor can then ensure the medicine prescribed does not cause these side effects for you.I would recommend finding a doctor who always does labs and can personal your hair regrowth treatment program to ensure that side effects are not part of the program.

Yes, you can take Cialis if you feel that you have erectile dysfunction. Speak with your doctor about getting an Rx