5th Shahrivar of the Iranian Calendar: is commemorated every year in the Islamic Republic as "Mohammad ibn Zakariya Raazi Day" and consequently "Pharmacology Day" in honour of this great Iranian-Islamic physician (854-925 AD) who was known as "Rhazes" to medieval Europe and who made fundamental and enduring contributions to various fields of medicine and related sciences, which he recorded in over 200 books and treatises. Among his important books on medicine is "al-Hawi al-Kabeer” on ways of leading a sound and healthy life. This monumental medical encyclopedia in nine volumes is also known as "Jame’ al-Kabir". He also wrote a home medical (remedial) novel for the general public titled "Man La Yahzuruhu at-?abeeb”, ("Who has no Physician to Attend Him”). Later in our programme, you will listen to a special feature on Zakariya Raazi.