I was prescribed two doses a day. I also didn’t like IR. All I did was ask my doctor. She was ok with it but she wanted me to monitor my ability to sleep. Worked ok. My sleep was fine. However, I eventually switched to Vyvanse. It works better for me.
I was worried she say no. But she was very understanding and wanted to help me. I was 30 when I was diagnosed but didn’t take medication until I was 37.