Safety monitoring of herbal medicines in Nigeria: worrying state of pharmacovigilance system based on WHO core pharmacovigilance indicators

Sulayman Tunde Balogun ¹ * , Kenneth Okwong Okon ² , Ayodele Oluwasoji Akanmu ¹ , Leonard Mela Paul ¹, Olufunke Adebola Sodipo ¹