1 Infants: Lethargy, weakness, poor feeding, constipation, poor head control, poor gag and sucking reflex.  Children and adults: Double vision, blurred vision, drooping eyelids, slurred speech, difficulty swallowing, dry mouth and muscle weakness.
After completing an ADN degree one can take the NCLEX-RN licensure exam in order to become a registered nurse. An associate's degree in nursing can take two years and at times also three years to compete.
Because of the in-depth training required to become a nurse practitioner and the educational requirements to become licensed, many years of formal education are required beyond high school. It usually takes at least 6 to 8 years of education and training to become an NP.