“Can I take a lower metformin dose due to fasting?”

I have been taking metformin 500 mg twice daily for 6 months and have noticed an improvement in my menstrual cycles and general wellbeing. However, I will be fasting for the month of Ramadan. Can I take only 500 mg once a day, at sunset when breaking my fast? I have the option to take 500 mg in the morning before starting the fast, but I fear I could get hypoglycemia.

I have gotten a blood sugar crash (dizzy, headache) a few times because I did not eat a snack between meals, but I have never gotten this when fasting. Background info: 20F, height-156 cm, 41 kg, BMI 18(I eat well, but I cannot put on weight, possibly, due to genetics). I do not drink/smoke/take drugs.