Is 18 mmol/l high blood sugar after eating, my dad has fever 37c also takes insulin. he is feeling weak since a week. any suggestions how to lower blood sugar currently taking panadol, diclofast, mixtard 30 10ml?

LOW sugar!: 18 mmol sugar reading is LOW, especially after a meal. If his sugar is in this range often he needs LESS insulin & you should consult his Dr right away because low sugar can lead to coma if excessively low . Some diabetics will have lower insulin requirements if they have kidney disease, weight loss, or other issues . 37 degrees C is a normal body temperature.