My father is having type 2 dibetes and GFR comes

Patient: My father is having type 2 dibetes and GFR comes 48.0 . can GFR level be increased ? what should he can do?these are the reports please copy paste the below link in new tab to see the reportshttps://www.dropbox.com/sh/9n7gniuwldyjkrc/AAA9oSKA-un-CDNfIzUXp7uZa?dl=0what should i do to increase the gfr leel to 60Age : 58weight : 65height : 5 feet 5 inchmy father was taking lantus insulin 36 units before meal at night and voglistar pm 0.3 2 times a day before meal . but he always constipated so the new medicine prescribed is glimestar h and to stop taking insulin . will this medicene be enough.

Symptoms: Constipation

Doctor: