Medicines and vaccines supply chains challenges in Nigeria: a scoping review.

Background: Medicines and vaccines supply chains represent critical systems for realising one of the major targets of the United Nations' third Sustainable Development Goals (SDGs)-access to safe, effective, quality, and affordable essential medicines and vaccines, for all. However, evidence suggests the system is confronted with several challenges in many low-medium income countries, including Nigeria. This scoping review aims to summarize the available evidence on the challenges of medicines and vaccines supply chain system in Nigeria.