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.
After the nurse has completed an MSN, he then can pursue further education to become a nurse practitioner. RNs must work for two years or more before applying to a nurse practitioner or NP program. An additional one to two years of additional schooling is required before the nurse practitioner can become certified.