Hi, Finasteride is used to treat men for hair loss. While it is generally well-tolerated, it has been known to cause sexual side effects in some men, including erectile dysfunction, decreased libido, and ejaculatory disorders. These side effects are usually mild and resolve when the medication is discontinued, but in some cases, they may persist. In your case, it is possible that the finasteride could be contributing to your sexual difficulties, including premature ejaculation and penile sensitivity. However, other factors could also be at play, such as anxiety or stress. It would be best to speak with your healthcare provider to discuss your concerns and explore possible treatment options. They may recommend adjusting your medication, trying a different medication, or exploring psychological interventions to help address your symptoms. If you require a personalized response, kindly use the Ask A Doctor service and post a follow-up. Take care. Hope I have answered your question. Regards, Dr. Priyanka, General & Family Physician