Thanks for posting your query at DoctorSpring.com
I have gone through your question in detail and I can understand what you are going through.
This is a very different query and let me be frank to say that we have never received a similar query. There are no medically indicated treatment for such a thing as increased erection is never a disease. However there are some medicines (anti-depressants) which can reduce the desire and erection as a side-effect. Paroxetine and escitalopram are few of them. When given this will reduce the desire and also may reduce the erection but its not a 100% sure result. Moreover these medicines are not over the counter medicines and will require a valid prescription of a psychiatrist.
Hope this helps,
In case if you have any further query, do let me know.
Dr. Srikanth Reddy