Can you tell me if there are any side effects of carotid stent procedure?

Potentially yes.... Carotid stenting is associated with a 4%-8% stroke risk (higher than endarterectomy), 1%-2% potential risk for a heart attack (lower than endarterectomy), and femoral artery access complications such as bleeding (unique to carotid stenting). In the properly selected patient (suitable anatomy) with active heart disease, previous surgery or neck radiation, carotid stenting is a great procedure.
Stroke. Small risk of stroke. Make sure doctor has lots of experience and uses protection device. Stroke risk depends on doctor doing case usually less than 5%. Must discuss this with your doctor.