His best work, a medical encyclopedia titled Al Hawi fi al Tibb, (called Continens in Europe) was the first medical book printed in Europe in 1486 A.D. and used until the 18th century. Rhazes used music to heal his patients, and differentiated between smallpox and measles.
Kitabu chake bora zaidi, ensaiklopidia ya tiba iliyoitwa Al Hawi fi al Tibb, (kilifahamika kama Continens Ulaya) kilikuwa ni kitabu cha kwanza cha tiba kuchapishwa Ulaya mwaka 1486 B.K. na kilitumika hadi karne ya 18. Rhazes alitumia muziki kutiba wagonjwa wake, na alitofautisha ndui na surua.