How Can Fever And Loose Motion In A Toddler Be Managed When Calpol Is Ineffective?

Hi my son is 16 months weight 11.3kg having fever n loose motion from yesterday but for fever calpol is not responding n some time we use meftal p and other cefixime oral susp ip 25mg and Bacillus clausii spores suspension. plz guide n doctor also suggest for dengue but it tough to take sample