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.
Associate's Degree Programs. An associate's or bachelor's degree is needed to become a registered nurse. Associate degree programs are offered at many vocational schools and community colleges. Earning an associate's degree in nursing (ADN) can take between two to three years.