Sydenham also named scarlet fever and differentiated it from measles, first used laudanum (a solution of opium in alcohol) as a medication, and helped popularize the use of quinine for malaria.

• 西德纳姆还为猩红热命名，区别其与痲疹的不同，同时最早使用鸦片酒（一种鸦片的酒精溶液）进行药物治疗，并协助推广奎宁治疗疟疾。