Is there a way to raise blood sugar levels without having to eat?

Since fasting month (ramadan [happy ramadan!]) has started i decided to try to fast atleast for one day. I've never tried it before and my doctor told me i shouldn't but i really wanted to try (If my BG goes under 70 mg/dl i will immediately stop and eat. I'm not pushing myself. Only trying). So far it's going good and i only have 5 hours left (by the time i'm posting this) and i wanted ask if you guys know ways to raise your BG without eating? It would mean alot!

Edit: Thank you guys for your help!