The World Health Organization (WHO) published its first model essential drugs
list (EDL) in 1977, which member states used to produce their national EDLs.
Despite some progress in improving access to essential drugs, the availability of
medications is still grossly insufficient in developing countries. This study
revealed a significant relationship between immunization coverage for measles,
diphtheria, tetanus, pertussis and infant mortality rate. Results failed to show a
relationship between the adherence index to the WHO model list of
immunologicals and immunization coverage. The study revealed that national
EDLs do not include many drugs from the WHO model list. The general systems
theory was used to organize this work. A secondary data was analyzed using
Pearson’s correlation and coefficient of variation.