Micronase is generally a safe drug but does have a few rare side effects. Some individuals may develop nausea, stomach upset, heart burn and weight gain. However, in most cases these effects are transient and disappear with time. Individuals who take Micronase should make it a habit of measuring their blood sugars regularly to ensure that they to do not develop very low blood sugar levels. Low blood sugar levels may present as chills, sweats, blurred vision, tingling, drowsiness or rapid heart rate. When this occurs, it is necessary to drink some orange juice or eat a sugary snack. Nonetheless, if the situation does not seem to get better, contact your local doctor immediately.