Badr al-Dī, n Muhammad ibn Bahrā, m ibn Muhammad al-Qalā, nī, si al-Samarqandi was a famous Iranian physician. Despite dispute among scholars, including Leclerc, Brockelmann, Kahhā, la, Zahir al-Baba (the editor of Qalā, nī, si's Qarabadin), lived in the 6th-7th century A. H. based on facts found in his only available book Qarā, bā, dī, n,and literature of descendant physicians who used or quoted his ideas. As he stated, lack of sources with clear manual of preparing and using compound medicines, encouraged al-Qalā, nisī, , to write his book using reputative Greek and Islamic references like works of Galen, Dioscorides, Thā, bit ibn Qurra, Ali ibn Sahl Rabban al-Tabari, Rhazes, Al-Bī, rū, nī, , Avicenna while mentioning them by abbreviations. Following a noteworthy introduction about simple drugs, he has explained how to prepare, preserve and use compound drugs, in forty-nine chapters. The main subject of two last chapters is how to get rid of vermins, and some supernatural or magical uses of simple medicines, with citation of references. Al-Qalā, nī, si has noteworthy innovations in preparation and using compound medicines that individuates his work. His book has recently been translated into Persian but there are some criticisms on it.