Hi Sir Thanks for seeking help here in practo. If Ur erection size is only 2.5 inch then it's a small penis which can be due to low testosterone. Low testosterone has many reasons like pituitary failure, gonadal failure. In those cases u can try medication. The other cases penis found to be more than 4 inch still people complain for size issues. What we suggest in those cases only stretching exercises. There are no Medication for size increases.

Hi I'm Dr.S.R.Raveendran MD There very few options available for penis enlargement. 1. Vacuum suction - Very less effect 2. Surgical procedures - Surgical procedures will give you immediate results with side effects