There are many sound hadiths which urge the Muslim to recite du`as for good health and protection from harms and ills such as “Allahumma inni a ‘udhu bika min al-barasi wa’l-jununi wa’l-judhami wa min sayyi’il-asqam.”

This dua “Alhamdullilah alladhi la yuhmadu ‘ala makruhin siwah” was not narrated from the Prophet Muhammad (peace and blessings be upon him). It is better to say ‘alhamdulillah ‘ala kulli hal’.